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Cisco Systems CCNA 2 User's Information Guide

1. g o g o p 9 ro CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 7 Copyright 2004 Cisco Systems Inc 219 17 100 0 in 1 hops 199 6 13 0 in 1 hops 210 93 105 0 in 3 hops Other commands that can be used to troubleshoot RIP update issues include the following e show ip rip database e show ip protocols e show ip route e debug ip rip e show ip interface brief 7 2 7 Preventing routing updates through an interface The passive interface command prevents routing updates from being sent out a particular interface In the graphic Router Z interface Fa0 0 is not allowed to send router updates to Router A This may be implemented for a variety of reasons One reason might be that the administrator of Router Z does not want information about the internal network to be sent out to other routers If Router Z is a stub network the administrator of Router A may prevent routing updates from being sent to Router Z since there is one way in and one way out Students must understand that routes will still be learned through this interface They also need to know that the network that this interface is connected to is advertised if a network statement is configured for that network Does not want dynamic routes advertised Command Router Z config router passive interface Fa0 0 7 2 8 Load Balancing with RIP 85 238 Load balancing is the process o
2. TGV Inc 32K bytes of non volatile configuration memory 8192K bytes of processor board System flash Configuration register is 0x2102 Eva show hosts Default domain is not set Name address lookup uses static mappings Read ONLY Host Flags Age Type Address es Boaz perm OK 4 IP 172 16 64 2 172 16 96 1 Centre perm OK 4 IP 172 16 64 1 172 16 128 1 V2 Oe S241 152 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Case Study Copyright 2004 Cisco Systems Inc Eva show startup config Using 1156 out of 32762 bytes l version 11 1 service slave log service udp small servers service tcp small servers hostname Eva enable secret 5 1SejwrSqcHMWf3GAiWytPceeWK1ly0 l ip subnet zero l interface Ethernet0 description Eva LAN workgroup interface ip address 172 16 160 1 255 255 224 0 ip access group 103 in j interface Serial0 no ip address shutdown no fair queue interface Seriall description Eva WAN interface to Centr ip address 172 16 128 2 255 255 224 0 l router igrp 11 network 172 16 0 0 ip host Boaz 172 16 64 2 172 16 96 1 ip host Centre 172 16 64 1 172 16 128 1 172 16 32 1 no ip classless ip http server access list 103 permit ip 172 16 160 access list 103 permit ip 172 16 160 004 31 255 access list 103 deny tcp 172 16 160 0 0 0 31 255 any eq telnet access list 103 deny icmp 172 16 160 0
3. Review the following key points e CDP is Cisco proprietary e CDP runs on any SNAP enabled media e CDP functions at Layer 2 and functions independent of the upper layers e CDP is used by all Cisco network devices such as routers switches and bridges e CDP utilizes periodic advertisements to obtain or update information about directly connected devices Have students perform the CDP neighbor lab Web Links http www cisco com univercd cc td doc product software ios121 121cger fun_r frort3 frd3001b htm CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 4 Copyright 2004 Cisco Systems Inc 4 2 Getting Information about Remote Devices Essential Labs 4 2 2 4 2 3 4 2 4 4 2 5a 4 2 56 and 4 2 6 Optional Labs None Core Tis All Optional Tis none Course Level Claim Students can perform simple LAN troubleshooting Certification Level Claim Students can troubleshoot a device that is part of a working network Hands on skills none 4 2 1 Telnet Telnet provides network administrators with remote connection capability It is a part of the TCP IP protocol suite that operates at the application layer of the OSI model and the application layer of the TCP IP model The Telnet service in Cisco devices operates as a virtual terminal utility Administrators can use Telnet to issue IOS commands when they are not directly connected to the device Telnet consumes a vty session on the router when i
4. e How long would the other hosts on the network have to wait to get any network access Even without an exact answer the students can see the inefficiency of streaming on all the other hosts Calculate the wait with the formula 200MB x 8bits byte media speed After data is segmented it must be transmitted to a destination device Flow control regulates how much data is sent during a transmission The process of flow control is known as windowing Window size determines how much data can be transmitted at one time The host must receive an ACK before any more data can be sent TCP uses sliding windows to determine transmission size This allows for negotiation of the window size to allow for more than one byte to be sent This allows for the destination device to tell the source to decrease or increase the amount of data being sent This is an important concept for the students to understand This helps the student understand the entire process of TCP and why it is considered reliable and connection oriented 113 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 10 Copyright 2004 Cisco Systems Inc 10 1 5 Sequencing numbers Since TCP breaks data into segments the receiver must reassemble the data segments once all of the data is received TCP issues a sequence to the data segments so that the receiver can properly reassemble the bytes into their original form Emphasize that this is important because data may ar
5. http www hillgrave com htpe index html 5 2 5 Managing IOS images using TFTP A router may need to have an IOS upgrade or restored A router should be backed up upon arrival The IOS image can be stored in a central server with other IOS images to restore or upgrade the IOS into the router and switch The server should use a TFTP service The IOS upgrade can be initiated from the privileged EXEC mode with the command copy tftp flash The router will prompt the user to enter the IP address of the TFTP server and then request the filename of the IOS image If there is not sufficient flash available the router may prompt the user to erase flash Flash will be erased before the new image is downloaded Students must realize that it is important to maintain current versions of the IOS to eliminate security problems and performance bugs They also should know that the newer releases are larger and may require flash and RAM upgrades To ensure a successful transfer students can ping the TFTP server from the router to test reachability Stress that when students enter a path name or the name of the IOS the entry must be exact If it is not exact the procedure will not work One technique is to cut and paste the name of the file from a Windows Explorer directory listing Explain that this process takes time since the IOS is several megabytes and patience is required Also point out that the letter e appears when flash is being erased and an exclamation
6. Figure 1 Dartmouth Problem Solving Cycle Design is an iterative process that starts with brainstorming From there it proceeds through research and problem solving matrices and design specification tests Multiple repetitions of this process are required until an adequate solution to a problem is achieved Any Academy curriculum with projects or design activities allows instructors to introduce elements of the Dartmouth Problem Solving and Design Method The website associated with this section has online resources and written materials that can be downloaded and a video that can be ordered There are other methods that are also effective Cisco encourages instructors to use the method that works best for them and their students Whether students will troubleshoot problems in an existing network or design and check a network to meet specifications the process involves an iterative problem solving procedure For Internet problems and issues related to general engineering problem solving matrices are useful when there many alternatives for a given number of constraints Chapter 1 The Engineering Problem Solving Cycle of the Engineering Problem Solving for Mathematics Science and Technology Education uses the problem solving matrix to introduce the problem solving cycle and its iterative nature The matrix teaches students how to define a problem Chapter 4 Guiding Students Through the Problem Solving Cycle explains how the entire process can be
7. KWHLAQ What do we think we Know about the subject What do we Want to find out about the subject How are we going to go about finding our answers What do we anticipate Learning What have we learned Can we Apply our learning to other subjects or projects What new Questions have surfaced through out time of inquiry Figure 1 Inquiry Based Learning When people uncover uncertain curious or interesting phenomena in life questions naturally arise that encourage quests for answers Inquiry is a natural process that begins as soon as a child starts to experiment with language As questions are asked the answers often lead to more questions This begins a cycle of inquiry for learning In education instructors refer to this process as inquiry based learning or problem based learning The basic requirements of either practice are strong reading skills and good scientific observation techniques One methodology for inquiry based learning is called KWHLAQ The following questions breakdown the KWHLAQ method e What do learners think they Know about the subject e What do learners Want to find out about the subject e How are learners going to go about finding the answers e What do learners anticipate Learning What have they learned e Can learners Apply their learning to other subjects or projects e What new Questions have surfaced throughout the time of inquiry Within any inquiry based learning activity or pro
8. NetDay is a great example of challenge based learning and Cisco encourages instructors to incorporate it into their classes Teaching and learning environments extend beyond the lab setting Opportunities for real world applications emerge when students can use their networking skills in projects that contribute to community initiatives Sometimes these activities are called service learning The Cisco Networking Academy Program originated as a community project In the mid 1990s educational institutions around the world experienced a demand for computer networks that exceeded the skilled personnel available to install and maintain those networks Cisco engineer George Ward worked to address these issues He articulated the need for a course sequence that would train high school students to support their school networks This need for versatile apprentices became the Cisco Certified Network Associate CCNA curriculum 196 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Appendix B Copyright 2004 Cisco Systems Inc A NetDay occurs when a community volunteers time to wire a school It is a popular type of community project that involves students parents network administrators and others who work together to get students connected to the Internet Academy students participate in numerous NetDays Another example of a community project was developed by the Cisco Academy of South West Ohio CASWO This Academy and its st
9. access list 1 99 gt IP standard access list 100 199 gt IP extended access list 1000 1099 gt IPX SAP access list 1100 1199 gt Extended 48 bit MAC address access list 1200 1299 gt IPX summary address access list 1300 1999 gt IP standard access list expanded range lt 200 299 gt Protocol type code access list lt 300 399 gt DECnet access list lt 600 699 gt Appletalk access list lt 700 799 gt 48 bit MAC address access list lt 800 899 gt IPX standard access list lt 900 999 gt IPX extended access list lt 2000 2699 gt IP extended access list expanded range rate limit Simple rate limit specific access list ANAK AANA t cota The students will need to memorize the ACL numbers rti config access list 1 deny Specify packets to reject permit Specify packets to forward remark Access list entry comment rti config access list 1 permit Hostname or A B C D Address to match any Any source host host A single host address rti config access list 1 permit 192 168 0 1 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 11 Copyright 2004 Cisco Systems Inc A B C D Wildcard bits log Log matches against this entry lt cr gt rtl config access list 1 permit 192 168 0 1 0 0 0 0 log Log matches against this entry lt cr gt Give students a list of rules for access lists to help them understand this concept
10. Capability Codes R Router T Trans Bridge B Source Route Bridge S Switch H Host I IGMP Device ID Local Intrfce Holdtme Capability Platform Port ID Centre Ser 1 147 R 2500 Ser 1 Eva show ip route Codes C connected S static I IGRP R RIP M mobile B BGP D EIGRP EX EIGRP external O OSPF IA OSPF inter area El OSPF external type 1 E2 OSPF external type 2 E EGP i IS LS E1 IS IS level 1 L2 IS IS level 2 candidate default U per user static route Gateway of last resort is not set 172 16 0 0 16 is subnetted 4 subnets Cc 172 16 128 0 is directly connected Seriall E 172 16 32 0 100 8576 via 172 16 128 1 00 01 17 Seriali I 172 16 96 0 100 10576 via 172 16 128 1 00 01 18 Seriall I 172 16 64 0 100 10476 via 172 16 128 1 00 01 18 Seriall Eva show ip protocol Routing Protocol is igrp 11 Sending updates every 90 seconds next due in 24 seconds Invalid after 270 seconds hold down 280 flushed after 630 Outgoing update filter list for all interfaces is not set Incoming update filter list for all interfaces is not set Default networks flagged in outgoing updates Default networks accepted from incoming updates IGRP metric weight Kl 1 K2 0 K3 1 K4 0 K5 0 IGRP maximum hopcount 100 IGRP maximum metric variance 1 Redistributing igrp 11 Routing for Networks L72 620 2 0 Routing In
11. Emphasize the following points e Use one access list for each protocol and for each direction e Place standard access lists closest to the destination e Place extended access lists closest to the source e Apply the in or out keyword as if from inside the router e Remember statements are processed sequentially from the top of the list until a match is found and if no match is found the packet is denied e Remember there is an implicit deny all at the end of ACLs that will not appear in the configuration listing e Remember the match condition is examined first and the permit or deny is examined ONLY if the match is true e List statements from specific references such as individual hosts to general references such as entire networks when access list logic overlaps e Do not work with an access list that is actively applied e Use Notepad or a similar text editor to create comments that outline the logic and then fill in the statements that perform the logic e Remember new lines are always added to the end of the access list e Usethe no access list x command to remove an entire list since it is not possible to selectively add and remove lines e Remember that an IP access list will send an ICMP host unreachable message to the sender of a rejected packet and will discard the packet e Use care when removing an access list If the access list is applied to a production interface and it is removed there may
12. Now you can paste your PIX show tech Z m E support or running configuration into Output Interpreter to automatically convert conduit outbound or apply statements to access list statements Feedback Help The Output Interpreter is a troubleshooting tool that will report potential problems by analyzing supported show TAC Case Open command output View an example of results generated C by this tool Command Lookup Tool for Cisco 10S Not all commands are supported by Output Interpreter Look up supported commands relevant to your issue maa pi in the following lists Bug Toolkit List of Supported Show Commands c The list of commands the Output Interpreter can analyze and information on the analysis Problem to Command Mappings c Recommended command s to submit to troubleshoot the issue you are experiencing Enter show command s output from your device for analysis Remove passwords and other sensitive information Paste the output of your command s in the field below view Output Example C7 Note You can paste multiple command outputs in the field below Or for output larger than 30K click the Browse button to upload a file Enter a file name or browse your disk Browse Output Interpreter is a Web based application that provides a troubleshooting analysis and a course of action for a router switch or PIX device Output Interpreter uses a collection of show command output to per
13. Routers and Routing Basics v3 1 Instructor Guide Module 6 Copyright 2004 Cisco Systems Inc 6 1 4 Configuring default route forwarding Default routes are used to route packets with destinations that do not match any of the other routes in the routing table A default route is actually a special static route that uses the following format ip route 0 0 0 0 0 0 0 0 next hop address outgoing interface Use the following steps to configure default routes 1 2 Enter global configuration mode Type the ip route command with 0 0 0 0 for the destination network address and 0 0 0 0 for the subnet mask The gateway for the default route can be either the local router interface that connects to the outside networks or the IP address of the next hop router In most cases the IP address of the next hop router should be specified Exit global configuration mode Save the active configuration to NVRAM with the copy running config startup config command 192 168 1 0 24 192 168 0 0 24 192 168 2 0 24 50 0 192 168 1 2 192 168 1 1 Here is an example for Rt1 Rtl config terminal Enter configuration commands one per line End with CNTL Z Rtl config ip route 0 0 0 0 0 0 0 0 192 168 1 2 Rt1 config exit Rtl Rtl copy running config startup config Destination filename startup config Building configuration Rtl Remind students of different types of router modes 6 1 5 Verif
14. This could be a discussion about problems that might be experienced in the lab or problems can be placed on the student network 49 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 4 Copyright 2004 Cisco Systems Inc Module 4 Summary 50 238 Students must master CDP and network troubleshooting commands before they move on to Module 5 Online assessment options include the end of module online quiz in the curriculum and the online Module 4 exam Students should be familiar with the equipment that is in the room with them If they need to see how it is connected they can look at it Another assessment option is to put several interconnected and configured routers in a taped box with a console cable and a power strip cord coming out of it Mark the box with the name of a distant city Then ask the students to draw a topology map of the internetwork of that city Students should understand the following main points How to enable and disable CDP How to use the show cdp neighbors command How to determine which neighboring devices are connected to which local interfaces How to use CDP to gather network address information about neighboring devices How to establish a Telnet connection How to verify a Telnet connection How to disconnect from a Telnet session How to suspend a Telnet session How to perform alternative connectivity tests How to troubleshoot remote terminal connections CCNA 2 Rou
15. e What mode is the user in after entering the enable command 3 1 2 Configuring a router name One of the first basic configuration tasks is to name a router This task helps with network management and uniquely identifies each router within a network Use global configuration mode to name a router The name of a router is called the hostname and will be displayed as the system prompt If a router is not named then the system default will be Router Students need to understand that the name is an important part of the configuration process Much of the configuration and troubleshooting will be performed remotely Users will telnet into different routers For practice ask students to name the routers When instructors are asked to help troubleshoot a lab they can easily identify the different routers The router name at the prompt confirms the student has completed this task Students should also understand that names should be chosen to represent a location or a function In many organizations there are naming conventions to be followed Ask students the following questions e What is the default name of the router e In which mode can the user name the router e What is the command to name a router 3 1 3 Configuring router passwords 29 238 Passwords can be used to secure a router and restrict access Passwords can be established for virtual terminal lines and the console line The privileged EXEC mode may also have a passwor
16. log update Control access list log updates logging Control access list logging standard Standard Access List cr ot 126 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 11 Copyright 2004 Cisco Systems Inc Then enter extended or standard rtl config ip access list extended lt 100 199 gt Extended IP access list number WORD Access list name The name used is named_ACL rtl config ip access list extended named_ACL rtl config ext nacl rtl config ext nacl Ext Access List configuration commands default Set a command to its defaults deny Specify packets to reject dynamic Specify a DYNAMIC list of PERMITs or DENYs evaluate Evaluate an access list exit Exit from access list configuration mode no Negate a command or set its defaults permit Specify packets to forward remark Access list entry comment From this point the ACL will work like any other extended ACL 11 2 4 Placing ACLs ACLs are used to control traffic by filtering packets and eliminating unwanted traffic on a network Another important consideration of when ACLs are implemented is the placement of the access list The ACL should be placed where it has the greatest impact on increased efficiency The general rule is to put the extended ACLs as close as possible to the source of the traffic that is denied Standard ACLs do not specify destinatio
17. on their own lab setup but ensure that students enable CDP when they are finished 4 1 6 Troubleshooting CDP 43 238 CDP does not require any configuration However there may be times when some of the following commands may be helpful in the troubleshooting process A common problem may be devices with different versions of CDP The show cdp neighbor command will show whether or not a device exists in the CDP neighbor cache and indicate if a device is utilizing version 2 of CDP CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 4 Copyright 2004 Cisco Systems Inc 44 238 Command Purpose clear cdp table Deletes information about neighbors from the CDP table clear cdp counters Reset traffic counters to zero show cdp traffic Displays CD counters such as the number of packets sent and received and checksum errors show debugging Displays information about the types of debugging that are enabled for the router debug cdp adjacency Displays CDP neighbor information debug cdp events Displays CDP events debug cdp ip Displays CDP IP information debug cdp packets Displays CDP packet related information cdp timers Specifies how often the Cisco IOS software sends CDP updates cdp holdtime Specifies the hold time to be sent in the CDP update packet show cdp Displays global CDP information such as timer and hold time information
18. show ip protocol command should be used to verify that routing protocols are correctly configured This command can be used to view the routing protocols enabled on the router CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 7 Copyright 2004 Cisco Systems Inc the networks advertised timer values and other routing protocol specific information The show ip route command displays the routing table and lists the next hop to all known networks how the route was learned the metric and other route specific information The show run command can be used to verify the running configuration Have the students verify proper operation of IGRP on the lab topology 7 3 8 Troubleshooting IGRP 90 238 Most of the IGRP configuration errors involve a bad network statement discontiguous subnet or incorrect autonomous system number The following commands are used to troubleshoot IGRP e show ip protocols e show ip route e debug ip igrp events e debug ip igrp transactions e ping e trace Both the debug ip igrp events anddebug ip igrp transactions commands can be used to verify that routing information is being passed between routers The ping command can be used to test network connectivity The trace command can be used to locate pinpoint delay or connectivity issues Have the students take a break and place several IGRP problems on the lab topology When the students return from the break instruct them to troublesh
19. used a network administrator must configure information about remote networks manually Any network topology changes require the network administrator to add and delete static routes to account for the changes Ask students the following questions e What is the difference between static and dynamic routing e When should a static route be used instead of a dynamic routing protocol 6 1 2 Static route operation 63 238 Static route operations can be divided into three parts e Network administrator configures the route e Router installs the route in the routing table e Packets are routed through the static route Since a static route is manually configured the administrator must configure the static route on the router with the ip route command The administrator can accomplish this objective in one of two ways The administrator can specify the outgoing interface or the next hop IP address of the adjacent router CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 6 Copyright 2004 Cisco Systems Inc 192 168 1 0 24 192 168 0 0 24 192 168 2 0 24 50 0 192 168 1 1 _ 7_ 79S0 0 192 168 1 2 From Rt1 either of the following commands will work Rt1 config ip route 192 168 2 0 255 255 255 0 192 168 1 2 This command should be interpreted as To reach the network 192 168 2 0 that has a subnet mask of 255 255 255 0 the next hop in the path is 192 168 1 2 or Rt1 config ip route
20. 1 troubleshooting service e Improve network performance and security e Perform entry level tasks in the planning design installation operation and troubleshooting of Ethernet and TCP IP Networks 4 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Course Overview Copyright 2004 Cisco Systems Inc Students must successfully complete the CCNA 2 course before they can achieve CCNA certification Upon completion of this course students will be able to perform tasks related to the following e Routers and their roles in WANs e Cisco IOS Software Management e Router configuration e Router file management e RIP and IGRP routing protocols e TCP IP error and control messages e Router troubleshooting e Intermediate TCP e Access control lists Lab Requirements Please refer to the CCNA equipment bundle spreadsheets on the Cisco Academy Connection Certification Alignment The curriculum is aligned with the following Cisco Internet Learning Solution Group ILSG courses e CCNA Cisco Certified Network Associate e INTRO Introduction to Cisco Networking Technologies The Course 2 claims state that students will be able to complete the following tasks e Identify the key characteristics of common wide area network WAN configurations and technologies and differentiate between these and common LAN technologies e Describe the role of a router in a WAN e Describe the purpose and operations of the router Internet
21. 16 32 1 255 255 224 0 interface Ethernetl 147 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Case Study Copyright 2004 Cisco Systems Inc i i r no ip address shutdown nterface Serial0 description Centre WAN interface to Boaz ip address 172 16 64 1 255 255 224 0 no fair queue clockrate 56000 nterface Seriall description Centre WAN interface to Eva ip address 172 16 128 1 255 255 224 0 clockrate 56000 outer igrp 11 network 172 16 0 0 ip host Centre 172 16 64 1 172 16 128 1 172 16 32 1 ip host Boaz 172 16 64 2 172 16 96 1 ip host Eva 172 16 128 2 172 16 160 1 n b P 1 1 o ip classless anner motd CThis is a SECURE SYSTEM UNAUTHORIZED USERS will be rosecuted C ine con 0 password cisco login ine aux 0 line vty 0 4 password cisco login end Centre 148 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Case Study Copyright 2004 Cisco Systems Inc Security Management documentation Centre 2500 Centre show ip interface EthernetO is up line protocol is up Internet address is 172 16 32 1 19 Broadcast address is 255 255 255 255 Address determined by setup command MTU is 1500 bytes Helper address is not set Directed broadcast forwarding is enabled Outgoing access list is not set Inbound access list is not set Proxy ARP is enabled Security level is default Split hor
22. All Optional Tls none Course Level Claim Students can evaluate the characteristics of routing protocols CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 6 Copyright 2004 Cisco Systems Inc Certification Level Claim Students can evaluate the characteristics of routing protocols Hands on skills none 6 3 1 Path determination Path determination occurs at the network layer or Layer 3 for traffic that goes through a network cloud The path determination function enables a router to evaluate the available paths to a destination and to establish the preferred way to handle a packet This information can be configured by a network administrator or collected through the dynamic processes that operate in the network Routing protocols help prevent routing loops and use fewer resources An administrator can configure static routes for all reachable networks Routers perform two primary functions e Path selection e Switching During path selection the routing table is examined to determine the next hop destination of a packet and which interface to use to reach that next hop destination Switching occurs when a packet is moved to the interface and a frame is created to send the information 6 3 2 Routing configuration Global and interface parameters must be set when an IP routing protocol is selected Global tasks include the selection of a routing protocol either RIP or IGRP and IP network numbers must be indica
23. Before students begin Module 4 they must be able to perform a basic router configuration in a limited amount of time and without assistance Basic configuration includes hostnames passwords interfaces and the ability to verify their work with show commands Online assessment options include the end of module online quiz in the curriculum and the online Module 3 exam Formative assessments can also be conducted as students work on the routers to monitor how well a lab is performed This section summarized the main points in router configuration The router has several modes User EXEC mode Privileged EXEC mode Global configuration mode Other configuration modes The CLI can be used to make changes to the configuration such as the following Set the hostname Set passwords Configure interfaces Modify configurations Show configurations Students should understand the following main points Configuration standards are important elements in the ability of any organization to maintain an efficient network Interface descriptions can include important information to help network administrators understand and troubleshoot their networks Login banners and messages of the day provide users with information when they log in to the router Host name resolutions translate names to IP addresses to allow the router to quickly convert names to addresses Configuration backup and documentation is extremely important to keep a network
24. CRC 0 frame 194 packets output 12076 bytes 0 0 output errors 0 collisions 0 output buffer failures 1 carrier transitions DCD up DSR up DTR up RTS up CTS up Rtl Rtl ping 192 168 2 1 te input a m 0 output Use the escape sequence to abort Sending 5 100 byte ICMP Echos to seconds tril Success rate is 100 percent 5 5 32 32 36 ms Rtl Traceroute command from Rtl Rtl traceroute 192 168 2 1 Typ scape sequence to abort Tracing the route to 192 168 2 1 1 192 168 1 2 16 msec 16 msec Rtl CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 6 0 no bu 0 overrun up 0000 usec rxload 1 255 et 00 output hang never counters 00 35 48 queue 0 75 0 drops 0 packets sec packets sec ffer 0 giants 0 throttles O ignored 0 abort underruns F 5 interface resets buffers swapped out 192 168 2 1 timeout is 2 round trip min avg max Copyright 2004 Cisco Systems Inc 6 2 Dynamic Routing Overview Essential Labs None Optional Labs None Core Tis All Optional Tis none Course Level Claim Students can evaluate the characteristics of routing protocols Certification Level Claim Students can evaluate the characteristics of routing protocols Hands on skills none 6 2 1 Introduction to routing protocols A routing protocol is a type of communication that is
25. Catalyst Switches Switches 5500 5000 2926G 2926 Series Switches Catalyst 1200 Series Switches Catalyst 2600 Series Catalyst 3000 3 100 3200 Catalyst 6000 Series This Web page is the source for Cisco password recovery procedures The password recovery procedure for every Cisco device can be found here http Avww cisco com warp public 474 162 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Appendix A Copyright 2004 Cisco Systems Inc 6 TAC Case Collection Register Contacts amp Feedback Help Site Map Select a Locati nguage Technical Support gt fso Cisco SYSTEMS TECHNICAL TAC Case Collection The TAC Case Collection an evolution of the Troubleshooting Assistant tool helps you interactively identify and troubleshoot common problems involving hardware configuration and performance issues These solutions provided directly by TAC engineers have resolved actual networking problems Please select a technology or product area from the list below to begin troubleshooting Note New knowledge bases only support browser versions IE 5 5 and later or Netscape 6 x and later Feedback Help ATM Media Support ATM link level access TAC Case Open TAC Case Query Dial Access c7 NEW oer Aan q DDR amp non DDR callout using external modem CAS T1 E1 PRI or BRI Local and AAA server based authentication and authorization LCP Che ap De mit and NCP negotiations authentication failure link
26. IOS Make sure students realize that network problems can affect the process when the IOS is loaded from a TFTP server Explain that the IOS loaded from ROM is only a subset of the IOS loaded from flash The figure is not complete because ROM is not included 5 1 3 Using the boot system command The boot system command can be used to specify where and the sequence in which the router will look for the IOS After the boot system command has been saved to the start up configuration in NVRAM it will be used in the next start up to locate the IOS When the IOS is loaded from flash memory it is located locally which isolates the process from any network problems that might be associated with TFTP The IOS may be loaded from a TFTP server if the flash memory has been corrupted If the IOS is not loaded from flash or the TFTP server a subset of the IOS can be loaded from ROM Make sure students understand that the IOS loaded from ROM is only a subset of the Cisco IOS software and might be an older version Use the boot system command to specify a fallback sequence and save it to NVRAM Restart the router and allow the students to verify the boot system locations during the next start up Explain why it is important to save the boot system commands to NVRAM 5 1 4 Configuration register The configuration register is a 16 bit register that contains the boot field setting in the lowest four bits This boot field can be changed with the config register
27. IP addresses e Enable or disable split horizon 82 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 7 Copyright 2004 Cisco Systems Inc 7 2 3 Using the ip classless command The ip classless command allows packets that are bound for an unknown subnet to be routed out the same interface as other known subnets in the same range of addresses IP classless only affects the operation of the forwarding processes in IOS It does not affect the way the routing table is built When the no ip classless command is used a packet bound for an unknown subnet will be dropped even if a route to a subnet in the same address range exists The basic principle of classful routing is that if one part of a major network is known but the subnet toward which the packet is destined within that major network is unknown the packet is dropped One aspect of this rule that may confuse students is that the router will only use the default route if the destination major network does not exist in the routing table at all 7 2 4 Common RIP configuration issues 83 238 RIP is a distance vector routing protocol and like all distance vector protocols they are slow to converge and have to deal with routing loops and counting to infinity To reduce the routing loops and counting to infinity RIP uses the following mechanisms e Split horizon e Poison reverse e Holddown counters e Triggered updates RIP permits a maximum hop count of 15 and
28. ISDN damage can occur The students should be taught to be observant and careful whenever connections are made Ask students the following questions e What type of cable is used to connect from the router Ethernet interface to a hub or switch e What type of cable is used to connect from the router Ethernet interface to a router Ethernet interface 1 2 7 Connecting WAN interfaces There are many forms of WAN connections A WAN uses many different types of technology to make data connections across a broad geographic area WAN services are usually leased from service providers The WAN connection types include leased line circuit switched and packet switched Many of the WAN interfaces use the same physical interfaces but different pinouts and electrical characteristics This difference in electrical characteristics could potentially cause damage if the wrong connections were made Again the students should be taught to be observant and careful when they make any connections Ask students to perform the following tasks e List the physical layer standards that Cisco routers support e List the different types of WAN connections 16 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 1 Copyright 2004 Cisco Systems Inc Module 1 Summary Before students move on to Module 2 they must be able to cable the lab setup identify all external relevant ports and identify internal router components Online assessment
29. OSPF Area 1 Stub Figure 1 CCNP Labs DLCI 16 DLCI 17 Adtran Atlas 550 lt Adtran 2 1 S 0 0 1 172 16 2 3 24 Baypointe Fad 172 16 20 1 24 OSPF Area 2 Stub The CCNP curriculum teaches students how to plan design install operate and troubleshoot enterprise level TCP IP Ethernet routed and switched networks with substantial remote access The CCNP curriculum consists of four courses e Advanced Routing e Remote Access e Multilayer Switching e Network Troubleshooting The curriculum is lab intensive Approximately 50 percent of all class time spent on lab exercises The required lab equipment for CCNP 1 includes workstations routers and switches CCNP 1 students acquire lab skills that enable them to perform the following tasks e Design scalable networks 182 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Appendix B Copyright 2004 Cisco Systems Inc e Implement advanced IP address management techniques e Configure and test the EIGRP OSPF and BGP routing protocols which help make most enterprise Intranets and the Internet possible The required lab equipment for CCNP 2 includes workstations routers switches and a WAN simulator CCNP 2 students acquire lab skills such as the following e WAN design e Dial up point to point ISDN Frame Relay and X 25 WAN protocol configuration and testing e Basic network security The required lab equipment
30. ROM e 10S is loaded from flash TFTP or ROM e Config is loaded from NVRAM or TFTP into setup mode This section teaches students how to check the configuration during the boot process Setup mode is intended to quickly install a router with minimal configuration Discuss the initial startup of routers and explain why the IOS and configuration files can be loaded from several places 2 2 2 Router LED indicators Router LED indicators indicate the status of a router If an interface is extremely busy its LED will be on all the time The green LED will be on after the router card initializes correctly Have the students view the LED indicators on the routers in the lab setup Show them LEDs that work correctly and explain what they are Make sure the students understand that the port status and link LEDs are the prime indicators of the physical layer status 2 2 3 The initial router bootup Bootup messages displayed by a router include messages such as NVRAM invalid possibly due to write erase which indicates that the router has not been configured or the backup configuration has been erased 21 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 2 Copyright 2004 Cisco Systems Inc If a router does not boot up correctly issue the show version command to examine the configuration register to see if it is booting Remind the students that the router is a special purpose computer It has a boot sequence th
31. Summary 61 238 Students must be able to manage configuration files and verify the file system with show commands before they begin Module 6 Online assessment options include the end of module online quiz in the curriculum and the online Module 5 exam Students should understand the following main points e Identify stages of the router boot sequence e Identify how the Cisco device locates and loads the Cisco IOS e Identify the configuration register settings e Identify the files used by the Cisco IOS and their functions e Identify the locations on the router of the different file types e Identify the parts of the IOS name e Manage configuration files using TFTP e Manage configuration files using copy and paste e Manage IOS images with TFTP e Manage IOS images with Xmodem e Verify the file system using show commands CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 5 Copyright 2004 Cisco Systems Inc Module 6 Routing and Routing Protocols Overview When teaching Module 6 remind students that routing refers to the directions that are given to move packets from one network to another These directions which are also known as routes can be dynamically given to the router by another router or they can be statically assigned to the router by an administrator Make sure students understand static routing Module 6 Caution This information contains fundamental terminology that instructors may need to get the
32. Systems Inc 9 2 3 Testing by OSI layers Testing should begin with Layer 1 of the OSI model and work to Layer 7 if necessary The ping command is used at Layer 3 The telnet command is used at Layer 7 Both of these commands will be discussed in detail in a later section It is important for the students to understand which types of errors occur at the different layers of the OSI model This is a good opportunity to group students together to practice for an exam or earn extra credit through competitive activities For example describe a type of error and have the teams compete to determine the associated layer Relevant Tis from CCNA 2 v2 1 4 are 13 1 1 and 13 1 5 The students need to understand the ping process and what is tested by each ping e ping the loopback address e ping the interface address e ping the local router interface address e ping a remote host address 9 2 4 Layer 1 troubleshooting using indicators Indicator lights are useful troubleshooting tools Most interfaces or NICs have indicator lights that show if there is a valid connection The interface may also have lights to indicate if traffic is being sent or received Have the students discuss possible Layer 1 problems Instruct students to check for the simplest of problems first such as power cords or electricity 9 2 5 Layer 3 troubleshooting using ping The ping utility is used to test network connectivity Echo protocols are used to test if protocol packets are
33. The Cisco Networking Academy Program serves hundreds of thousands of students in almost 150 countries Students range from early teens to mature adults and from advanced middle school students to undergraduate engineering students One curriculum cannot fit the needs of all students WWE relies on local instructors to make the program work and to help their students achieve the learning goals of the program There are three fixed reference points for each program that provide flexibility for the instructors e The mission of WWE to educate and train e The requirements of the CCNA certification exam e The hands on skills that help prepare students for the industry and further education The WWE policy allows instructors to add anything but subtract nothing from the curriculum WWE supports in class differentiation which is used to provide additional support for students who need it and additional challenges for advanced students WWE also allows instructors to decide how much time to spend on various topics Some topics can be skimmed while others may need to be emphasized for different audiences The local instructor must decide how to balance the need for hands on labs with the realities of the local student to equipment ratio and time schedule This Guide can be used to facilitate the preparation of lesson plans and presentations Instructors are encouraged to research and use external sources to develop additional labs and exercises Core
34. The first part of the IP extended ACL is the same as the IP standard ACL The number is within the range of 100 to 199 rtl config access list 101 deny Specify packets to reject dynamic Specify a DYNAMIC list of PERMITs or DENYs permit Specify packets to forward remark Access list entry comment The permit or deny is the same as the standard rti config access list 101 permit lt 0 255 gt An IP protocol number ahp Authentication Header Protocol eigrp Cisco s EIGRP routing protocol esp Encapsulation Security Payload gre Cisco s GRE tunneling icmp Internet Control Message Protocol igmp Internet Gateway Message Protocol igrp Cisco s IGRP routing protocol ip Any Internet Protocol ipinip IP in IP tunneling nos KA9Q NOS compatible IP over IP tunneling ospf OSPF routing protocol pcp Payload Compression Protocol pim Protocol Independent Multicast tcp Transmission Control Protocol udp User Datagram Protocol In an extended ACL the protocol is listed after the permit or deny statement Then enter the source address with the wildcard mask and destination address with the wildcard mask rtl config access list 101 permit tcp 172 16 0 1 0 0 0 0 192 168 0 0 0 0 255 255 ack Match on the ACK bit eq Match only packets on a given port number established Match established connections fin Match on the FIN bit gt Match only pac
35. alternate backup copy However the file will need to be edited before it can be used to restore configuration to a router To capture the configuration in HyperTerminal students should perform the following tasks e Select Transfer gt Capture Text e Specify the name for the text file e Select Start e Usethe show running config command to display the configuration e Press the Spacebar when each More prompt appears 56 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 5 Copyright 2004 Cisco Systems Inc After the configuration has been displayed students should select Transfer gt Capture Text gt Stop to stop the capture After the capture is completed the configuration file needs to be edited to remove text that is not required to configure a router Then it can be pasted back into the router if needed The configuration file can be edited from a text editor such as Notepad The following steps are used to edit the file e Select File gt Open e Find the captured file and select it e Click Open The lines that need to be deleted contain the following e show running config e Building Configuration e Current Configuration e More e Any lines that appear after the word End e Atthe end of each of the interface sections students should add no shutdown e To save the clean version select File gt Save Before the configuration is restored any remaining configuration should be remov
36. any destination greater than 15 hops away is tagged as unreachable This maximum hop count prevents counts to infinity and endless network routing loops The split horizon rule prevents information about a route from being sent out the same interface from which it was originally received Split horizon is used to avoid the creation of routing loops due to multiple routers that advertise routes to each other about the same network The no ip split horizon command can be used to disable split horizon Hold down timers are used to define the amount of time that a possible down route will be held and routes with higher metrics to the same network will not be accepted The default hold down time is 180 seconds which is 6 times the regular update period When a route goes down the hold down timer is started During this time period a route with a higher metric than the original metric will not be accepted If the original route comes back up or a route with a lower metric than the original metric is advertised they will be accepted immediately The hold down timer will reduce routing loops but it may also slow convergence The timers basic 30 90 180 540 router configuration command can be used to adjust the basic timers The holddown is the third number RIP updates are broadcast by default every 30 seconds This can be increased to reduce network congestion or decreased to improve convergence with the timers basic 30 90 180 540 command The update tim
37. are accepted The default holddown time is greater than three times the update time The flush timer indicates the amount of time that a route should remain in the routing table before it is flushed This time should be at least as long as the holddown and invalid times combined This will allow the proper holddown phase otherwise the route may be flushed and new routes may be accepted prematurely The default flush timer is seven times the update time The show ip protocol command should be used to view the timers and then timers should be changed and viewed again CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 7 Copyright 2004 Cisco Systems Inc The debug ip igrp events command can be used to verify that the timers affect routing updates Have the students configure IGRP on the lab topology 7 3 5 Configuring IGRP To enable IGRP routing use the router igrp as number global configuration command To disable IGRP routing use the no router igrp as number command E config router igrp as number config router config no router igrp as number config RouterA RouterA RouterA RouterA eens leew oe ea To identify which networks will participate in the IGRP routing process use the network network address router configuration command To remove a network from the IGRP routing process use the no network network address command RouterA config router igrp 101 RouterA config r
38. are transmitted with the IP protocol so their delivery is unreliable ICMP packets have their own special header information which starts with a type field and a code field Potential causes of specific ICMP error messages The functions of ICMP control messages ICMP redirect change request messages ICMP clock synchronization and transit time estimation messages ICMP information request and reply messages ICMP address mask request and reply messages ICMP router discovery message ICMP router solicitation message ICMP congestion and flow control messages 100 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 8 Copyright 2004 Cisco Systems Inc Module 9 Basic Router Troubleshooting Overview When teaching Module 9 emphasize the fact that the ability to interpret a routing table is of fundamental importance to networking professionals This module is dedicated to routing tables and troubleshooting tools such as the show ip route command Module 9 Caution Students need to understand how to use these commands and interpret their output This module is usually very interesting to students Students who complete this module should be able to perform the following tasks Use the show ip route command to gather detailed information about the routes installed on the router Configure a default route or default network Understand how a router uses Layer 2 and Layer 3 addressing to move data through the
39. be a default deny any applied to the interface and all traffic will be halted If the IOS defaults to permit all there will be no security or performance regulation e Remember outbound filters do not affect traffic that originates from the local router These rules will help students become successful with using ACLs This is not an all inclusive list and it can be presented in any order 122 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 11 Copyright 2004 Cisco Systems Inc 11 1 4 The function of a wildcard mask A wildcard mask is paired with an IP address The binary numbers one and zero in the mask are used to identify how the corresponding IP address bits should be handled Wildcard masks are used for different purposes and follow different rules than subnet masks Wildcard masks are designed to filter individual or multiple IP addresses to permit or deny access to resources based on the addresses Another issue is that the ones and zeros mean something different in wildcard and subnet masks In the wildcard mask process the IP address in the access list statement has the wildcard mask applied to it This creates the match value which is used to determine if a packet should be processed by a specific ACL statement or sent to the next statement to be checked There are two special keywords that are used in ACLs the any and host options The any option substitutes for the IP address and 255 255
40. being routed The ping command sends a packet to the destination host and then waits for a reply packet from that host Results from this echo protocol can help evaluate the path to host reliability delays over the path and if the host can be reached or is functional The ping command can be invoked from both user EXEC mode and privileged EXEC mode To use the extended ping command the user must be in privileged EXEC mode Explain to the students that it is a good idea to use the ping command when the network functions properly to see how the command works under normal conditions This can also be used to make comparisons when troubleshooting The students should relate ping to reachability 9 2 6 Layer 7 troubleshooting using Telnet Telnet is a virtual terminal protocol that is part of the TCP IP protocol suite Telnet allows the verification between source and destination stations The telnet command provides a virtual terminal so administrators can use Telnet operations to connect with other routers that use TCP IP The telnet command will be discussed in later sections of the curriculum At this point students should understand the functions of Telnet 106 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 9 Copyright 2004 Cisco Systems Inc 9 3 Troubleshooting Router Issues Overview Essential Labs 9 3 4 9 3 5 and 9 3 7 Optional Labs None Core Tis All Optional Tis none Course Level Claim Students ca
41. can use pictures music color and movement This strategy is related to Howard Gardner s work with multiple intelligences 178 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Appendix B Copyright 2004 Cisco Systems Inc e Use visual advance organizers to introduce new concepts analyze and synthesize levels of comprehension Organizers prepare the brain for the arrival of new content This technique builds upon existing Knowledge to facilitate the acquisition of new knowledge e Use humor which is a powerful stimulant to the brain The mind easily latches onto the silly and unimaginable e Use movement and action These are important motivators that can help some students with learning disabilities process information The hands on labs will greatly benefit these students e Instruct students to talk about or write about what they have learned what they found interesting and what they still need to learn at the end of each topic Reflection moves new knowledge into long term memory e Offer additional time for students with learning disabilities to formulate responses to questions This extra time can be very important e Help students with learning disabilities maintain an emotional state that is free from anger and frustration Students can work through tasks more easily when they are calm and focused Web Links National Center for Learning Disabilities http www ncld org Strategies for Teaching Stu
42. co occur with learning disabilities incidence estimates vary Features can include marked over activity distractibility and or impulsivity which in turn can interfere with an individual s availability to benefit from instruction Figure 1 Learning Disabilities Instructors will probably have a few students with learning disabilities in their classes The following list summarizes some approaches to teaching students with learning disabilities Many of these suggestions also apply to students without learning disabilities e Engage the students with lesson starters that illicit emotion and feelings This introduction to learning instructs the brain to pay attention e Provide opportunities for teamwork Many students with learning disabilities will have a higher level of motivation to succeed in response to peer interactions than when working alone e Teach students to write their own personal learning goals Instruct them to write short and long term goals and provide feedback on their progress e Provide numerous models examples and representations of curriculum concepts e Speak aloud in class to benefit students with learning disabilities Discuss the steps and thoughts that occur during the problem solving process e Use simple memory tools to help students process information for retrieval at a later time These tools are called mnemonics and include rhythms or unique patterns of language that are easy to remember Mnemonics
43. command and is verified with the show version command The least significant bits indicate the location from which the router will be booted Zero will cause the router to boot in ROM monitor mode one will cause the router to boot from ROM and two to F will cause the router to use the boot system command in NVRAM Configuration Register Setting Location from which the router will boot 0x0 ROM monitor mode manual boot 0x1 ROM automatic 0x2 to OxF NVRAM More information can be found at the following website http www cisco com en US products sw iosswrel ps1828 products_ command reference cha pter09186a00800ca506 html 5 1 5 Troubleshooting IOS boot failure Students must be familiar with the boot sequence and the configuration register to be able to troubleshoot boot errors 53 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 5 Copyright 2004 Cisco Systems Inc If the router does not boot properly the show version command can be used to identify the configuration register setting The boot field indicates where the router is configured to boot from and the config register command is used to make any necessary changes If the router IOS does not boot properly there are several things that could be wrong e Boot system statement in configuration file e Incorrect configuration register value e Corrupted flash image e Hardware failure Instruct students to use the show version
44. command to check the configuration register value When a router does not boot properly it is usually because the configuration register setting is incorrect For students to understand the impact that the boot sequence and the configuration register has on routing they must perform the hands on labs Make sure each student can complete and explain the labs Discuss the results and purpose of the labs after they have been completed by all of the students Instruct students to verify the configuration register setting on a regular basis Occasionally change the configuration register settings and allow them to troubleshoot the errors that occur Additional Resources http Awww cisco com en US products hw routers ps233 products tech note09186a00800a65 a5 shtml http www cisco com en US products sw iosswrel ps1835 products command summary cha pter09186a00800801b1 html 5 2 Managing the Cisco File System Essential Labs 5 2 3 5 2 5 5 2 6a and 5 2 6b Optional Labs None Core Tis All Optional Tis none Course Level Claim Students can manage system image and device configuration files Certification Level Claim Students can manage system image and device configuration files Hands on skills none 54 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 5 Copyright 2004 Cisco Systems Inc 5 2 1 IOS file system overview A router or switch requires software to operate The following are two basic types o
45. consists of two steps 1 Enable the routing protocol 2 Identify the directly connected networks or the networks to advertise The global configuration command router rip is used to enable RIP as the routing protocol The network network address command allows the identification of directly connected networks that will participate in the routing process When the basic configuration of RIP is complete regular updates are sent every 30 seconds and triggered updates are sent upon notification of metric changes The following is an example of RIP configuration BHM config router rip selects RIP as the routing protocol BHM config router network 1 0 0 0 specifies a directly connect network BMH config router network 2 0 0 0 specifies a directly connect network Notice that the network statements configured under the RIP protocol are classful addresses Students commonly configure the network command by using the IP address of the subnet The IOS will change this to the classful network address The router interfaces associated with the directly connected networks will participate in the routing process These interfaces will send and receive routing updates RIP can be further customized through the use of some optional configuration parameters e Apply offsets to routing metrics e Adjust timers e Specify a RIP version e Enable RIP authentication e Run IGRP and RIP concurrently e Disable the validation of source
46. create their own rubrics based on established standards and performance objectives Assessment occurs continuously through self monitoring and self evaluation Students who are given direction and the freedom to choose their path of learning are empowered to accomplish high levels of achievement For Academy courses rubrics create specific expectation criteria for the final performance of a lab or activity In the demonstration of each task there is a specific set of performance levels for all objectives content and skills Each rubric contains a criterion that defines the elements that indicate learning proficiency Many rubrics are based on a four point scale where four points represent the best level Each point on the scale has specific criteria that describe the performance characteristics Before an assessment of student interactions classroom work or any performance lab or activity students should be aware of the expectations This will help them begin the process of self assessment as they progress through the individual tasks that are reflected in the rubric 230 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Appendix B Copyright 2004 Cisco Systems Inc Rubrics that are developed by both students and teachers can help students organize and prepare for learning through advance knowledge of their assessment expectations It also allows students to contribute to the development of the grading scale for their per
47. current router configuration Also make sure there is complete connectivity throughout the network before any of the ACLs are applied The following conditions must be taken into consideration when creating the ACLs e Workstation 2 and File Server 1 are on the management network Any device on the management network can access any other device on the entire network e Workstations on Eva and Boaz LANs are not permitted outside of their subnet except to access File Server 1 e Each router can telnet to the other routers and access any device on the network The team lead asks the technician to write down a short summary of the purpose of each ACL the interfaces upon which they will be applied and the direction of the traffic Then list the exact commands that will be used to create and apply the ACLs to the router interfaces Before the ACLs are configured on the routers review each of the following test conditions and make sure that the ACLs will perform as expected Telnet from Boaz to Eva SUCCESSFUL Telnet from Workstation 4 to Eva BLOCKED TELNET from Workstation 5 to Boaz BLOCKED TELNET from Workstation 2 to Boaz SUCCESSFUL TELNET from Workstation 2 to Eva SUCCESSFUL Ping from Workstation 5 to File Server 1 SUCCESSFUL Ping from Workstation 3 to File Server 1 SUCCESSFUL Ping from Workstation 3 to Workstation 4 SUCCESSFUL Ping from Workstation 5 to Workstation 6 SUCCESSFUL Ping from Workstation 3 to Workstation 5 BLOCKED Ping from
48. expired Make sure students understand that a triggered update is generated by the router that detects a topology change and sends the update to its neighbors 80 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 7 Copyright 2004 Cisco Systems Inc Network 10 4 0 0 is unreachable lt lt _ Router update timer at 18 seconds 7 1 7 Preventing routing loops with holddown timers Holddown timers are used to prevent update messages from reinstating inaccessible routes When a router receives an update that indicates that a network is unreachable it starts a hold down timer While the hold down timer is running the router will not accept any updates about the inaccessible route unless the update comes from the originator of the triggered update or from a router reporting a better metric to the inaccessible network If a router receives routing update information from a router other than the originator of the triggered update that says it has a route to the inaccessible network with a lower metric than the original metric the router ignores the update information while the holddown timer is still in effect Holddown timers are used to allow updates about bad routes to be propagated Routers that have already received the information will not accept update information about the bad route from neighbor routers that may not know that it is inaccessible Students may need some additional help with
49. honor Elaine and John Chambers as the 2002 NetDay Heroes in recognition of their extraordinary leadership and vision in both their professional and family commitments to education and education technology The Chambers have a long standing history of supporting education as individual philanthropists and corporate citizens As CEO of Cisco Systems Inc John has positioned Cisco s educational programs to represent powerful partnership models for corporations schools and nonprofits to achieve results in education Elaine and John Chambers received their 2002 Hero Awards at NetDay s annual Family Celebration on March 9 2002 at The TECH Museum of Innovation in San Jose CA Source http www netday org Figure 1 Challenges and Projects NetDay challenges are problem based labs or projects that are advocated by AAAS Project 2061 which is a science education reform project Unlike step by step labs these exercises encourage students to develop their own solutions to various problems or challenges The challenges vary in content and duration ranges from 50 minutes to 3 weeks These challenges consist of two basic parts First the lab asks students to solve a problem Second it asks the students to create a product For example a simple 50 minute challenge lab for the first semester might be titled Make a Patch Cable that Works Successfully A three week challenge that teaches more complex tasks might be called Wire the School Computer Lab
50. in CCNP 3 includes workstations hubs switches and routers CCNP 3 students acquire lab skills such as the following e Switch and VLAN configuration e Multilayer switching and redundancy technology implementation e Campus LAN design Required lab equipment for CCNP 4 includes workstations routers switches and a WAN simulator CCNP 4 students acquire lab skills and the ability to troubleshoot the following e LANs e WANs e Switches e Routers e TCP IP Protocols e Routing Protocols Standard and premium lab bundles are available A variety of optional bundles are also available The student to equipment ratio should be as low as possible Web Links Cisco Networking Academy Program http cisco netacad net 183 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Appendix B Copyright 2004 Cisco Systems Inc B 2 3 NETLAB Cisco Systems NETLAB Welcome to NETLAB LOGIN NETLAB allows you to access Cisco Network Academy equipment Username pods from anywhere on the Internet To access NETLAB you will rT tisSCT need a user ID and password assigned to you by your Cisco Network Academy Program instructor Password ore i e If this is the first time you have accessed NETLAB from this PC please verify your browser Submit Microsoft Intemet Explorer 5 x or Netscape 4 7x Java and Javascript enabled News and Announcements NETLAB Academy Edition Coming Soon NETLAB will give each Academy t
51. instructor led style of instruction is currently the most commonly used approach Academy instructors must communicate information to students based on required competencies and performance objectives Instructor led environments allow instructors to cover specified subject matter with a large group or small group of students at the same time This style of instruction can take place in an extended time frame which might require an entire class period or in a shorter time frame as a mini lecture Mini lectures focus on smaller chunks of content that students may need to hear at some point in the learning process An effective classroom strategy for this style of instruction is to present all lectures at a predetermined class time and as a precursor to individual and group work The current focus on the cooperative dynamics of learning has taken attention away from the importance of knowledge based processes and procedures Within the instructor led environment teachers can review strategies that will help students become better listeners This will prepare them to be more effective communicators in the academic and working world e A mini lecture is a 10 minute lecture format that might consist of the following elements e A hook e A pretest or focus question to test for comprehension e The actual lecture e A short question or activity 205 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Appendix B Copyright 2004 Cisco Sy
52. is the best As each routing process receives updates and other information it chooses the best path to any given destination and attempts to add this path to the routing table The router decides whether or not to add the routes presented by the routing processes based on the administrative distance of each route The route with the lowest administrative distance is considered the best route 103 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 9 Copyright 2004 Cisco Systems Inc Explain administrative distances to the students The administrative distance represents the trustworthiness of the source of a route The Cisco IOS is designed to trust directly connected routes more than any other source Directly connected routes have the lowest administrative distance of zero The IOS also trusts routes that are configured by a network administrator which are static routes These have an administrative distance of one Students should also learn the administrative distances of RIP IGRP EIGRP and OSPF The administrative distance must not be confused with routing metrics Metrics are calculated and compared among routes from the most trusted routing source The router will select the route from the best administrative source with the lowest metric This is an important concept for the students to understand 9 1 6 Determining the route metric Routing protocols use metrics to determine the best route to a destination T
53. is enabled Displays the type of device that has been discovered the name of the device the number and type of the local interface or port the number of seconds the CDP advertisement is valid for the port the device type the device product number and the port ID Displays information on the native VAN ID the duplex mode and the VTP domain name associated with neighbor devices when the detail keyword is used 4 1 4 Creating a network map of the environment 42 238 CDP uses advertisements to collect information about its neighbors Its limitation is that it only collects information from directly connected devices The telnet command can be used in conjunction with cdp commands to create a network map To do this a network administrator can console into one router and use the telnet command to move from router to router CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 4 Copyright 2004 Cisco Systems Inc If students have limited or no experience with the use of Telnet to move from device to device this concept and skill should be reviewed If students do not understand this capability it will be difficult to understand the procedure described in this RIO Demonstrate this capability if necessary Refer to the figure to show students how telnet is used to map a network Allow students to practice use of this command Instruct students to map their router setup or a setup performed by another group 4
54. is to route not to compute The main components of the router are as follows e RAM e NVRAM e Flash e ROM e Interfaces The following topics should be covered in this TI e Discuss the similarities of computers and routers such as the software they use e Explain the components of the router and what each component contains e Open a router and let the students examine the inside Point out the main components e Explain that just as a computer cannot work without an operating system and software a router cannot work without an operating system and configurations 1 1 3 Router LANs and WANs 12 238 Routers function in both LANs and WANs They are primarily used in WANs Explain that routers have both LAN and WAN interfaces Students should be able to identify the differences The two main functions of a router are to select the best path and to forward packets to the correct outgoing interfaces Networking models are useful because they facilitate modularity flexibility and adaptability Like the OSI model the three layer design model is an abstract picture of a network Models may be difficult to comprehend because the exact composition of each layer varies from network to network Explain that each layer of a three layer design model may include a router a switch a link or some combination of these Some networks may combine the function of two layers into a single device or may omit a layer entirely The three layer des
55. is up Internet address is 172 16 128 1 19 Broadcast address is 255 255 255 255 Address determined by setup command MTU is 1500 bytes 149 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Case Study Copyright 2004 Cisco Systems Inc Helper address is Directed broadcast not set forwarding is enabled Outgoing access list is not set Inbound access lis Proxy ARP is enabl Security level is Split horizon is e ICMP redirects are ICMP unreachables t is not set ed default nabled always sent are always sent ICMP mask replies IP fast switching IP fast switching IP multicast fast Router Discovery i are never sent is enabled on the same interface is nabled switching is enabled s disabled IP output packet accounting is disabled IP access violatio TCP IP header comp n accounting is disabled ression is disabled Probe proxy name r Gateway Discovery plies are disabled is disabled disabled Policy routing is Centre show ip access lists lt none applied gt Centre 150 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Case Study Copyright 2004 Cisco Systems Inc Phase 5 Documenting the Network Sample outputs Eva 2500 Configuration Management documentation Eva 2500 Eva show cdp neighbors
56. iterated This includes suggestions on how to choose effective problems how to set up the right environment for brainstorming sessions and how to analyze the results of these sessions The goal is for students to gain an appreciation for the importance of problem solving which is one of the most important aspects of engineering Cisco also wants students to experience the use of these procedures to gain a better comprehension of why some potential solutions work and others do not They will learn that the ability to employ good problem solving procedures and documentation will ultimately determine their success with problem solving Eventually 198 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Appendix B Copyright 2004 Cisco Systems Inc students will be able to use the lessons learned from failed problem solving attempts to save time when they try to solve new problems Chapter 5 Research Documentation and Testing is a good resource for students to learn how to conduct site surveys keep work logs produce engineering reports and create portfolios Web Links Dartmouth Problem Solving and Design Method http thayer dartmouth edu teps index html 199 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Appendix B Copyright 2004 Cisco Systems Inc B 3 3 Brainstorming C umes gt Examples of Networks Cy Figure 1 Cluster Diagram Brainstorming techniques can be useful for
57. major transport layer protocols and the interaction and transportation of application layer data Certification Level Claim Students can evaluate the TCP IP communication process and its associated protocols Hands on skills none 10 1 1 TCP operation IP addresses allow for the routing of packets within and between networks However it makes no guarantee about delivery The transport layer is responsible for the reliability of data flow This is accomplished through the use of sliding windows and sequencing numbers along with a synchronization process that ensures communication Have the students come up with an analogy One excellent example is a student who studies a foreign language for one year visits the country where the language is used and asks everyone to repeat their words for reliability and speak slowly for flow control 10 1 2 Synchronization or three way handshake TCP is connection oriented Prior to data transmission two hosts go through a synchronization process to establish a virtual connection This process ensures that both sides are ready for data and allows for the devices to determine the initial sequence numbers This process is a three way handshake Sequence numbers SYN and the role they play will be discussed in detail in a later section At this point it is important for students to understand that sequence numbers are used to initiate communication between two devices The sequence numbers give each host a way
58. must understand the differences between RAM ROM NVRAM and flash If the configuration is lost there should be backup copies available The backup configuration can be stored ona TFTP server The copy running config tftp command can be used to do this The steps to copy to a TFTP server are as follows e Enter copy running config tftp e Enter the IP address of the TFTP server at the prompt e Enter the name to assign to the configuration file e Answer yes each time to confirm the choices The steps to copy from a TFTP server to restore the configuration file are as follows e Enter copy tftp running config e Select a host or network configuration file at the prompt e Enter the IP address of the TFTP server where the config file is located e Enter the name of the config file or accept the default name e Confirm the configuration filename and the server address Make sure students realize that there are other ways to back up a configuration file Other methods will be discussed in later sections It is important for students to understand this process and all the procedures that are explained It is most important for students to understand that backups are an important part of network management 5 2 4 Managing configuration files using copy and paste Another way to create a backup copy of the configuration is to capture the output of the show running config command The output can be copied pasted into a text file and saved to create an
59. named ACLs Other types will be covered in the CCNP classes 127 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 11 Copyright 2004 Cisco Systems Inc 11 2 6 Restricting virtual terminal access Standard and extended access lists apply to packets that travel through a router They are not designed to block packets that originate within the router By default an outbound Telnet extended access list does not prevent router initiated Telnet sessions This type of ACL controls which users can telnet into a remote router To test this in the labs have students configure routers and telnet into a remote router to test connectivity Configure and apply the ACL to the vty lines to deny access Then test the Telnet again Here are the commands to configure virtual terminal access Rt1 config access list 2 permit 172 16 1 Rt1 config access list 2 permit 172 16 2 Rt1 config access list 2 deny any 0 0 0 0 255 0 0 0 0 255 Here are the commands to apply the access list Rt1 config line vty 0 4 Rt1 config line login Rt1 config line password secret Rtl config line access class 2 in 128 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 11 Copyright 2004 Cisco Systems Inc Module 11 Summary Before students take the final exam they should have mastered the configuration and placement of standard and extended IP access lists Onlin
60. network Use the ping command to perform basic network connectivity tests Use the telnet command to verify the application layer software between source and destination stations Troubleshoot by sequential testing of OSI layers Use the show interfaces command to confirm Layer 1 and Layer 2 problems Use the show ip route and show ip protocol commands to identify routing issues Use the show cdp command to verify Layer 2 connectivity Use the traceroute command to identify the path packets take between networks Use the show controllers serial command to ensure the proper cable is attached Use basic debug commands to monitor router activity 101 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 9 Copyright 2004 Cisco Systems Inc 9 1 Examining the Routing Table Essential Labs 9 1 1 9 1 2 and 9 1 8 Optional Labs None Core Tis All Optional Tis none Course Level Claim Students can configure verify analyze and troubleshoot simple distance vector routing protocols Certification Level Claim Students can troubleshoot and configure routing protocols based on user requirements Hands on skills none 9 1 1 The show ip route command One of the primary functions of a router is to determine the best path to a given destination A router learns paths from the configuration or from other routers through routing protocols They use RAM to store this routing information in routing tables A routing
61. not used in any calculation One additional item to note is that Cisco offers more support for EIGRP than IGRP Many of the newer releases of IOS do not support IGRP 7 3 2 IGRP metrics 87 238 IGRP uses several metrics to calculate the overall routing metric of each route e Bandwidth the lowest bandwidth value in a path e Delay the cumulative interface delay along a path e Reliability the reliability between source and destination determined by the exchange of keepalives e Load the load on a link between a source and a destination based on bits per second e MTU the maximum transmission unit value of a path The show ip protocol command is used to display parameters filters and network information about the routing protocol used by a router Each metric has a corresponding K value or weight By default only K1 and K3 are set to one These represent the K values for bandwidth and delay The K values of the other metrics are set to zero By default only bandwidth and delay are used to determine the composite metric or routing metric of each route This use of multiple components to calculate a composite metric provides greater accuracy than the RIP hop count metric to choose the best path The show ip route command displays the composite IGRP metric for a given route in brackets with the administrative distance A link with higher bandwidth will have a lower metric A link with lower cumulative delay will have a
62. options include the end of module online quiz in the curriculum and the online Module 1 exam Consider introducing formative assessments where the instructor supervises the students as they work on the router setup The use of formative assessments can be very valuable while students work through this router intensive and OS intensive course Students should understand the following main points e WAN and LAN concepts e Role of a router in WANs and LANs e WAN protocols e How to configure console connections e The identification and description of the internal components of a router e The physical characteristics of a router e The common ports on a router e How to connect router console LAN and WAN ports 17 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 1 Copyright 2004 Cisco Systems Inc Module 2 Introduction to Routers Overview Consider the prior knowledge of students when teaching Module 2 Some students may be familiar with command line interfaces CLIs Students who have only used GUIs may not know how to use CLIs to interact with a computer Students should experiment with CLIs to learn how to interact with a router Module 2 Caution Students need to know what the IOS is and what it does They also need to know the difference between the configuration file and the IOS It is also important for students to feel comfortable when they enter into and move around in the CLI Do not move too q
63. out an update to Router 1 about the status of Network A it cannot receive a report back from Router 1 about Network A From the description in the curriculum which is included above if split horizon were in use in Step 2 Router A would have ignored information about Network 1 from Router B More specifically Router B would not have attempted to update Router A about that particular network in the first place because Router A originally informed Router B about the status of Network 1 Refer to Figure 1 Routing Update for a graphical representation of this process CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 7 Copyright 2004 Cisco Systems Inc 7 1 5 Route poisoning Route poisoning is another process used by routers to prevent routing loops Briefly review the fact that routing loops are typically the result of slow convergence The loops are interrupted when maximum hop counts are defined so that packets that are caught in loops are eventually dropped Route poisoning is when the distance or hop count of a route is changed to 16 or 1 higher than the maximum number allowed which makes it unreachable from the perspective of the routers This process of route poisoning results in an update about the poisoned route that is sent out to neighboring routers before the routing update time has been reached X Reference the graphic in this section When Router A determines that Network X is down it poisons the ro
64. per destination basis implies that all packets headed for a particular host on the network during a given communication session will take the same path Students should be comfortable with the term round robin load balancing This means that packets will be equally shared between the equal paths This is done by alternating the packet output between the interfaces for each of the paths The students should also understand that this does not equally balance the traffic between the paths This is because the packets are of various sizes So even though the same number of packets will be forwarded out of the interfaces the amount of traffic will vary 7 2 10 Integrating static routes with RIP Static routes are user defined routes that force packets to take a specific path These are usually used when a dynamic route cannot be built the overhead of dynamic routing is not desirable or if another route for fault tolerance is desired A static route can be configured on the router with the ip route command and removed with the no ip route command These routes can then be redistributed or shared through the dynamic routing protocol with the redistribute static command 7 3 IGRP Essential Labs 7 3 5 and 7 3 6 Optional Labs 7 3 8 Core Tis All Optional Tis none 86 238 Course Level Claim Students can configure verify analyze and troubleshoot simple distance vector routing protocols Certification Level Claim Students can troubles
65. prior knowledge of students There are many forms of advanced organizers such as exposition narratives and graphics Graphic organizers are shown in Figures I through L2 These methods were publicized by a psychologist named David Ausubel in the late 1960s These techniques help students make connections between their current knowledge and the information needed to reach a more complete comprehension of a learning objective Graphic organizers also enable students to arrange large chunks of new information into smaller chunks These smaller pieces are easier to learn and understand 220 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Appendix B Copyright 2004 Cisco Systems Inc Cluster diagrams help students generate and organize thoughts When students brainstorm a question or concept is put in the center of a cluster and all of their ideas are added to the cluster Similar ideas are grouped together Cluster diagrams are also used as concept maps or to present course material to students They can also be used to assess how well students understand a concept Problem solving matrices are a standard part of design documentation In their simplest form a variety of design options such as network media network architecture or protocols are listed vertically and the specifications against which choices will be rated are listed horizontally In theory the option that earns the highest score against the specification rubric
66. request will be a broadcast When the router receives the request it will respond with an address mask reply This reply will identify the correct subnet mask This is an important concept for the students to understand This is also a good time to review IP addressing 8 2 6 Router discovery message When a host on a network boots and has not been manually configured with a default gateway it can learn the available routers through the process of router discovery This 98 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 8 Copyright 2004 Cisco Systems Inc process begins when the host sends a multicast router solicitation message to all routers with the address 224 0 0 2 If a router solicitation message is sent to a router that does not support the discovery process the solicitation will go unanswered However if it is supported a router advertisement is sent in return 8 2 7 Router solicitation message A host will generate an ICMP router solicitation message in response to a missing default gateway This message is sent multicast This is the first step in the router discovery process A local router will respond with a router advertisement that identifies the default gateway for the local host 8 2 8 Congestion and flow control messages 99 238 Congestion occurs when multiple computers try to access the same receiver or when traffic from a high speed LAN reaches a slower WAN connection The effect of c
67. reveal personal thoughts feelings and ideas Some students may choose not to share this type of information If instructors decide to practice this type of assessment in their classrooms there must be clear communication between the instructor and the students about the purpose of this activity The teaching and learning environment is strengthened when instructors and students take time each day for reflection Metacognition occurs when people think about their thought processes This can be done through written verbal kinesthetic or musical activities Reflection is an important tool to develop new comprehensions about the world When students ask essential questions about their learning experiences they can improve their information processing skills and become better problem solvers and communicators Journals provide a space for inner thought and reflection on experiences that occur in the teaching and learning process Instructors that incorporate journal writing into curriculum will usually set aside a period of time for this process The teacher and students can use this time to reflect on completed tasks or make predictions about future experiences Thoughts and ideas can be written down in a dedicated personal paper space or in a word processor file These thoughts can take many forms such as words sentences illustrations maps charts magazine pictures and newspapers Journal entries can take the form of guided or free style writin
68. router to display the port numbers However students must learn the most common port numbers These ports and their activities can be examined on a workstation from the command prompt with the netstat a command The ports that are listed as listening are services A good way to explain this concept is a server service listens on a given port number A client will initiate a session with the server by addressing that particular port number All inbound segments have a destination port number An application layer protocol or service looks at this port number to see if its port number is being addressed If it is not then the service ignores the segment Emphasize that the client initiates the session The server is listening and will respond when addressed 10 2 3 Ports for clients When a client connects to a service on a server a source and destination port must be specified Source ports which are set by the client are determined dynamically A client usually determines the source port by randomly assigning a number above 1023 Clients and servers use ports to distinguish what process each segment is associated with This is an important concept for the students to understand about port numbers Explain that the server responds with the same port numbers except the source and destination port numbers are swapped For example if the client initiates a session with a source port number of 1094 anda destination port number of 23 then the server
69. stress the fact that the fastest way to restore an IOS image to the router is to use TFTP from ROMmon to download the image http www cisco com en US customer products hw routers ps259 products tech note09186a0 08015bf9e shtml 5 2 8 File system verification 59 238 There are several commands used to verify the router file system One is the show version command This command is used to check the current image and available flash It also verifies the source of the IOS image and the configuration register boot field setting The show flash command is also used to verify the flash system This command identifies the amount of flash that is available It also confirms that there is ample space to store a new IOS image Configuration files may contain boot system commands These identify the source of the desired boot IOS image Multiple boot system commands are used to create a fallback sequence to discover and load an IOS Boot system commands are processed in the order of their appearance in the configuration file CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 5 Copyright 2004 Cisco Systems Inc Discuss the following alternatives with the students e NVRAM e TFTP server e ROM Make sure the boot commands are reviewed Stress the importance of familiarity with the bootup procedures 60 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 5 Copyright 2004 Cisco Systems Inc Module 5
70. table contains the best available routes to destinations The show ip route command displays the contents of the IP routing table The routing table contains entries for all known networks and subnetworks and a code that indicates how that information was learned Discuss how valuable the show ip route command is to network troubleshooting Routes can be added to a router through two methods e Static routing An administrator manually defines routes These routes do not change until a network administrator manually programs the changes e Dynamic routing Routers follows rules defined by a routing protocol to exchange routing information These routes change automatically as neighboring routers update each other with new information Discuss with the students the differences between static routing and dynamic routing This is an important concept for the students to understand The instructor should also emphasize that the router would not know what to do with a packet if there was no route to forward it toward the destination 9 1 2 Determining the gateway of last resort Routers do not maintain routes to every possible destination Instead routers can keep a default route or a gateway of last resort The router will use this default route to forward a packet to a different router Default routes can be statically entered by an administrator or dynamically learned through a routing protocol Before routers can dynamically exchange inf
71. teaching IT curriculum These techniques can be applied to areas such as introductions to new topics and integral parts of design work Figure 1 shows some responses to the question What does the word network mean There are four simple rules for this brainstorming activity e The wildest possible ideas are accepted e There will be no censorship of ideas e The instructor wants a high quantity of responses e Responses can build on the ideas of other people Another method for brainstorming is called carousel brainstorming This is a strategy used for creative thinking when multiple solutions are possible to solve an issue or problem During a carousel session problems are documented on large sheets of chart paper around a room Students in small cooperative groups are given different colored pens and asked to go around the room and brainstorm solutions to the problems listed on the different chart papers This is done in 30 second rotation sessions The process continues until students have an opportunity to respond to all problems or issues listed on papers around the room SCAMPER is another example of a brainstorming activity that encourages students to think creatively Scamper is an acronym for substitute combine adapt modify put to other uses eliminate and reverse It was first implemented in the 1940s by Alex Osborne and it was revised in the early 1980s by Bob Eberle 200 238 CCNA 2 Routers and Routing Basics v3 1 Instruc
72. the command history feature By default the command history records ten command lines in the history buffer To recall commands press Ctrl P or the Up Arrow key to recall repeated commands Press Ctrl N or the Down Arrow key to recall more recent commands in the history The Ctrl P and Ctrl N features are also likely to be tested on the CCNA exam CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 2 Copyright 2004 Cisco Systems Inc The syntax of IOS commands can be complex The feature used to recall commands can help students save time when they program or troubleshoot a router 2 2 9 Troubleshooting command line errors This troubleshooting lab allows students to log into the router and access various modes Demonstrate the use of the question mark as a helpful tool for students who do not know which command to enter Also demonstrate the use of the history command as a helpful tool for students to troubleshoot problems without retyping repeated commands 2 2 10 The show version command 24 238 The show version command displays information about the Cisco IOS software version This information includes the system image file name and the location from which it was booted It also contains the configuration register and the boot field setting Explain that an important aspect of router and IOS maintenance is to know exactly which version of the IOS is being used Cisco has numerous major and minor IOS relea
73. this program based upon a review of several factors Technical capacity will be one of the more important criteria A survey will be provided to interested Academies to identify the requirements for a successful solution Academies will need to have the proper infrastructure in place and must be able to demonstrate a sufficiently high level of technical expertise To learn how to utilize NETLAB the Cisco Networking Academy Program has created an online curriculum and comprehensive administrator instructor and student guides Although NETLAB seems intuitive and easy to use administrators and instructors should spend time becoming familiar with the numerous features of NETLAB Web Links NGD NETLAB http www netdevgroup com netlab htm 185 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Appendix B Copyright 2004 Cisco Systems Inc B 2 4 Simulations Terminal In this media activity you are logged in as user2 and your current working directory is home user2 dir1 Refer to the Class File Tree Structure by clicking the tree button located on the Menu Bar and type the commands that would accomplish the 4 lt 5 Figure 1 Simulations Research indicates that learning is more extensive when content is interactive and provides instant feedback The Academy curriculum contains a variety of interactive Flash activities One class of these activities is simulation Examples of simulations are content items s
74. to acknowledge the SYN bits so that the receiver knows the sender responds to the proper connection request This is done with bits in the TCP header These bits are called flags The two flags involved are Sequence numbers SYN and Acknowledge numbers ACK These flags are used to synchronize the SYN and ACK numbers between the hosts This will initialize the new session The three way handshake is a three step process that establishes the virtual connection between two devices 1 The source host initiates a connection The host sends a packet with the SYN bit set and indicates an initial sequence number of x with a bit in the header set to indicate a connection request 2 The destination host receives the packet records the sequence number of x replies with an acknowledgment of x 1 and includes its own initial sequence number of y It also sets the SYN bit to indicate the start of the return conversation 112 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 10 Copyright 2004 Cisco Systems Inc 3 The source host responds with a simple acknowledgement of y 1 to indicate that it received the previous ACK This finalizes the connection process The three way handshake is an important concept for the student to understand A relevant TI from CCNA 2 v2 1 4 is 9 1 6 10 1 3 Denial of service attacks Denial of service DoS attacks are designed to deny services to legitimate hosts that attempt to establi
75. 0 0 31 255 any banner motd CWarning This is a SECURE SYSTEM UNAUTHORIZED USER will be prosecuted C j 1 255 host 172 16 32 5 0 0 0 3 0 0 0 31 255 172 16 160 0 line con 0 exec timeout 0 0 password cisco login transport input none line aux 0 password cisco login line vty 0 4 password cisco login end Eva 153 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Case Study Copyright 2004 Cisco Systems Inc Security Management documentation Eva 2500 Eva tshow ip interface EthernetO is up line protocol is down Internet address is 172 16 160 1 19 Broadcast address is 255 255 255 255 Address determined by setup command MTU is 1500 bytes Helper address is not set Directed broadcast forwarding is enabled Outgoing access list is not set Inbound access list is 103 Proxy ARP is enabled Security level is default Split horizon is enabled ICMP redirects are always sent ICMP unreachables are always sent ICMP mask replies are never sent IP fast switching is enabled IP fast switching on the same interface is disabled IP multicast fast switching is enabled Router Discovery is disabled IP output packet accounting is disabled IP access violation accounting is disabled TCP IP header compression is disabled Probe proxy name replies are disabled Gateway Discovery is disabled Policy routing is disabled S
76. 0 24 172 16 0 0 30 Ri ee a 10 0 0 0 8 192 168 1 0 24 gt q C ISP2 e gt a 172 16 0 4 30 as 4 2 1 192 168 64 0 30 192 168 112 4 30 2 6 6 2 A Eastasman 1 192 168 72 1 24 192 168 64 0 20 192 168 72 1 24 192 168 64 0 20 S A a ax 192 168 120 0 20 STMP 192 168 80 0 20 192 168 96 0 20 Figure 1 Case Studies Case study teaching methods have become more important in many professions such as law medicine and business Case studies that are specified in the course or instructor developed can be used to integrate many concepts throughout the Academy curricula Figure 1 shows a case study from the CCNP curriculum The International Travel Agency is a fictitious business for which a CCNP certified individual might be asked to provide network services 202 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Appendix B Copyright 2004 Cisco Systems Inc Web Links Use of Master Classroom Technology to Implement a Case Study Approach to Learning http www mtsu edu itconf papers96 MASTER HTM Case Study Teaching in Science A Bibliography http ublib buffalo edu libraries projects cases article2 htm 203 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Appendix B Copyright 2004 Cisco Systems Inc B 3 5 Web research Cisco Systems Business Strategies amp Solutions Provisioned Services Products
77. 1 2 How ACLs work An ACL is a group of statements to permit or deny traffic on an inbound or outbound router interface The order in which ACL statements are placed is important The Cisco OS software tests the packet against each condition statement in order from the top of the list to the bottom When a match is found in the list an accept or reject action is performed and no other ACL statements are checked If additional condition statements are needed in an access list the entire ACL must be deleted and recreated with the new condition statements To simplify the process of revising an ACL it is a good idea to use a text editor such as Notepad and paste the ACL into the router configuration As a frame enters an interface the router checks to see if the Layer 2 address matches or if it is a broadcast frame If the frame address is accepted the frame information is stripped off and the router checks for an ACL on the inbound interface As a review ACL statements operate in sequential logical order If a condition match is true the packet is permitted or denied and the rest of the ACL statements are not checked 120 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 11 Copyright 2004 Cisco Systems Inc 11 121 238 If all the ACL statements are unmatched an implicit deny any statement is placed at the end of the list by default Even though the deny any is not visible it will deny any packets that
78. 1 5 Disabling CDP Although CDP is enabled by default on all Cisco devices there may be situations in which CDP must be disabled Three examples are included in the TI e f the bandwidth of a particular connection is inadequate CDP can be disabled to conserve bandwidth e Since CDP is a Cisco proprietary device if there is only one Cisco device ona network segment then there is no device with which to share information e lf a particular device is connected to some other network such as an ISP CDP can be disabled for security reasons This will prevent the device from advertising information about itself to outside devices CDP can be disabled at two levels e Theno cdp run command can be used in global configuration mode to disable CDP for the entire device This should be used when only one Cisco device is present and CDP would serve no purpose on the network segment e CDP can be disabled for a specific interface The network administrator must be in interface mode to perform this task The command is no cdp enable or no cdp advertise v2 based on the version of CDP that is used To determine if a particular interface has CDP enabled the show cdp interface command can be used in user or privileged mode The figures show the use of these commands Make sure students realize that CDP is enabled on all interfaces by default Demonstrate how to disable CDP at the interface level and globally Allow students to perform these commands
79. 1 Instructor Guide Case Study Copyright 2004 Cisco Systems Inc V Appendices A Cisco Online Tools and Utilities B Instructional Best Practices 156 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Appendices Copyright 2004 Cisco Systems Inc Appendix A Cisco Online Tools and Utilities Cisco Systems offer a wide range of online documents and tools to assist in the configuration troubleshooting and optimization of routers and switches These resources can be found on the Cisco Technical Assistance Center TAC website at http www cisco com tac To learn more about the Cisco TAC website visit http www cisco com public news training tac_overview html This document introduces ten valuable resources that are available to users at cisco com A cisco com user ID and password is required to access all of the tools on the Cisco TAC website A user ID and password can be obtained with a valid Cisco service contract at http tools cisco com RPF register register do 157 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Appendix A Copyright 2004 Cisco Systems Inc 1 Output Interpreter Cisco SYSTEMS Profile Contacts amp Feedback Help Site Map Select a Location i Language Technical Support B sol TECHNICAL SUPPORT Search CHNICAL SUPPOR R TOOLS amp UTILITIES co v Output Interpreter Search All Cisco com 7 Toolkit Roll Check out this new functionality
80. 192 168 2 0 255 255 255 0 s0 This should be interpreted as To reach the network 192 168 2 0 that has a subnet mask of 255 255 255 0 send the packet out interface serial 0 0 The administrative distance indicates the trustworthiness of the source of the route The router assigns an administrative distance of one to static routes by default The router assumes that if an administrator takes the time to figure out what route the packet should take then this routing information must be very reliable Only directly connected routes have a default administrative distance that is trusted more The default administrative distance for directly connected devices is zero Administrative distance should not be confused with the metric of the route The metric of the route indicates the quality of a route When a router decides which route to a particular destination to put in the routing table it compares the administrative distances of all the routes available to that destination The router then examines the routes with the lowest administrative distances and chooses the one with the lowest metric If the interface that a packet is to be sent to on the next hop is not up the route will not be installed in the routing table Here is an example of how a default administrative distance of 0 can be changed to an administrative distance of 255 Rt1 config ip route 192 168 2 0 255 255 255 0 192 168 1 2 255 CCNA 2 Routers and Routing Basics v3 1 Ins
81. 1992 2003 Cisco Systems Inc All rights reserved Important Notices Privacy Statement and Trademarks of Cisco Systems Inc Profile Contacts amp Feedback Help Site Map Select a Location Language Search Search All Cisco com ba Feedback Help TAC Case Open TAC Case Query Output Interpreter Explanations for console error message strings are listed in the Cisco Software System Messages guide http Awww cisco com cgi bin Support Errordecoder home pl 159 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Appendix A Copyright 2004 Cisco Systems Inc 3 Software Bug Toolkit Toolkit Roll Close Window Cisco SYSTEMS M Feedback Help SEARCH MY STUFF Select one of these options Enter known bug 1o Search example CSCdp94390 Search for Cisco lOS related bugs by release Click here for products running Cisco IOS This includes routers Catalyst and GSR 1 2000 Next To verify that you are running Cisco IOS type show version in enabled mode and look for the following Cisco Internetwork Operating System Software Search for bugs in other Cisco software and hardware products Find bugs for Catalyst OS Pix Firewall Network Management and more by selecting a product below Type your product name to find it in the list below Type your product name here CDN Software Service Provider Edition CWSI Campus Cisco 181 Analog Telephone Adaptor Close Wind
82. 20 1 via 199 6 13 1 00 00 06 Seriall R 219 17 100 0 24 120 1 via 199 6 13 1 00 00 06 Seriall R 192 5 5 0 24 120 2 via 199 6 13 1 00 00 06 Seriall C 199 6 13 0 24 is directly connected Seriall R 205 7 5 0 24 120 2 via 199 6 13 1 00 00 06 Seriall R 210 93 105 0 24 120 1 via 204 204 7 2 00 00 07 Serial0 4 2 6 Troubleshooting IP addressing issues Addressing issues are the most common problems that occur on IP networks Three commands can be used to perform troubleshooting telnet verifies the application layer software between the source and the destination This is the most complete test mechanism available ping uses the ICMP protocol to verify the hardware connection and the IP address of the network layer This is a very basic test mechanism traceroute is used to find failures in the path from the source to destination Traceroute uses time to live values to generate messages from each router along the path Troubleshooting is one of the most important skills of a network associate The majority of time in the workplace will be spent troubleshooting Students should develop these skills at every opportunity Help students learn the logical process what to look for and the tools to use Always use the OSI model to teach troubleshooting from Layer 1 to Layer 7 For students to become proficient at troubleshooting it must be a normal part of the labs Each lab should include a troubleshooting session
83. 255 255 mask This mask says to ignore the entire IP address or to accept any addresses The host option substitutes for the 0 0 0 0 mask This mask states that all IP address bits must match or only one host is matched The wildcard mask of a complete subnet mask can be found by subtracting the subnet mask from 255 255 255 255 For example if the subnet mask is 255 255 240 0 the following equation would be used 255 255 255 255 255 255 240 0 0 0 15 255 0 0 15 255 is the wildcard mask Emphasize the importance of assigning IP addresses within the subnetwork If addresses are logically assigned based on system use or location then an ACL can be created to permit or deny these hosts with a single statement These logical host IP address assignments should be based on the binary bit patterns of each address If these bit patterns have groupings of common bits in their addresses then an address and wildcard mask can refer to this group of hosts If addresses are made at random then the creation of ACLs to refer to particular groups becomes difficult or impossible without a statement for each host The IP address assignments should be consistent across the internetwork For example when a common group of bits is used to identify the network devices these same bits should be used to identify all network devices in the internetwork 11 1 5 Verifying ACLs The show ip interface command displays IP interface information and indicates if an
84. 3 Figure 7 Digital Signal Voice Channel Bandwidth Spectrum of Voice Signal Voice Pass Band 300 3 000 Hz VOLTAGE FREQUENCY KILOHERTZ Figure 8 Spectrum Diagram of a Voltage versus Frequency Graph 218 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Appendix B Copyright 2004 Cisco Systems Inc Data Link Data Link Figure 9 Data Encapsulation Field length Ethernet in bytes 7 1 6 2 46 1500 4 IEEE 802 3 Field length in bytes 7 1 6 6 2 46 1500 4 SOF Start of frame Delimiter FCS Frame Check Sequence Figure 10 Ethernet and IEEE 802 3 Frame Format 219 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Appendix B Copyright 2004 Cisco Systems Inc LANs are designed to Operate within a limited geographic area Allow multi access to high bandwidth media Control the network privately under local administration Provide full time connectivity to local services Connect physically adjacent devices Using SS pel Ep a E Figure 11 Local Area Networks and Devices WANs are designed to Operate over large geographical area Allow access over serial interfaces operating at lower speeds Provide full time and part time connectivity Connect devices separated over wide even global areas Using as Sh Rj Figure 12 Wide Area Networks and Devices Advanced organizers can be used to tap into the
85. 5 6 Lab exams Lab exams are also known as skills exams These exams give students an opportunity to demonstrate their knowledge of cable and router configuration Students use cables and routers to assemble a network in a lab Their performance task is to connect cables and routers so every router can successfully communicate with the other routers The number of routers to connect will vary based on equipment access This process is one that distinguishes the Cisco Networking Academy Program from all other programs When students graduate from the Academy they have been tested on their hands on expertise with equipment This practice supports authentic assessment and gives students higher credibility in the job market Lab Exam Skills Exam Examples from Academy Curriculum Curriculum Vendor Skills Tested Fundamentals of Voice and Data A n OOOO Figure 1 Lab Exams Lab exams include all of the following Cisco recommends a simple pass or fail grade with opportunities to retake the skills exam if necessary 235 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Appendix B Practical exams Performance exams Demonstration labs Skills based and performance assessments Authentic assessment Mastery learning Formative and summative exams Copyright 2004 Cisco Systems Inc Web Links Certification Magazine http www certmag com issues aug01 feature_long cfm CCIE http www cisco com warp public 625
86. 8 0 0 24 is directly connected FastEthernet0 0 C 192 168 1 0 24 is directly connected Serial0 0 S 192 168 2 0 24 is directly connected Serial0 0 Rtl 6 1 6 Troubleshooting static route configuration 67 238 The show interfaces command can be used to check the state and configuration of the interface that will be used for the route gateway The ping command is used to determine if end to end connectivity exists If an echo reply is not received after a ping the traceroute command will be used to determine which router in the route path is dropping the packets 192 168 1 0 24 192 168 0 0 24 192 168 2 0 24 50 0 192 168 1 2 192 168 1 1 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 6 Copyright 2004 Cisco Systems Inc 68 238 Here are the outputs of the show interface ping and traceroute commands Rtl show interfaces s0 Serial0 0 is up line protocol is Hardware is PowerQUICC Serial Internet address is 192 168 1 1 24 MTU 1500 bytes BW 128 Kbit DLY 2 reliability 255 255 txload 1 255 Encapsulation HDLC loopback not s Keepalive set 10 sec Last input 00 00 00 output 00 00 Last clearing of show interface Queueing strategy fifo Output queue 0 40 0 drops input 5 minu rate 0 bits sec 5 minute output rate 0 bits sec 0 194 packets input 12076 bytes Received 194 broadcasts 0 runts O input errors 0
87. 84 238 Some common RIP configuration errors include incorrect network statements discontiguous subnets and split horizons These RIP update issues can be identified with some basic show and debug commands The debug ip rip command enables rip debugging and will display all of the rip updates as they are sent and received The following is an example of the output of the debug ip rip command LAB A debug ip rip RIP protocol debugging is on AB A IP ignored vl update from bad source 223 8 151 1 on Ethernet0 IP sending vl update to 255 255 255 255 via Ethernet0o 192 551 network 204 204 7 0 metric 3 etwork 223 8 151 0 metric 3 etwork 201 100 11 0 metric 1 etwork 219 17 100 0 metric 2 etwork 199 6 13 0 metric 2 etwork 205 7 5 0 metric 1 etwork 210 93 105 0 metric 4 RIP sending vl update to 255 255 255 255 via Ethernetl 205 Tea L network 204 204 7 0 metric 3 etwork 223 8 151 0 metric 3 etwork 201 100 11 0 metric 1 etwork 219 17 100 0 metric 2 etwork 192 5 5 0 metric 1 etwork 199 6 13 0 metric 2 etwork 210 93 105 0 metric 4 RIP sending vl update to 255 255 255 255 via Serial0d 201 100 11 1 network 192 5 5 0 metric 1 network 205 7 5 0 metric 1 RIP ignored vl update from bad source 219 17 100 1 on Ethernet0O RIP received vl update from 201 100 11 2 on Serial0d 204 204 7 0 in 2 hops 223 8 151 0 in 2 hops AAT S 5 nga n
88. Appendix B to earn that point value 1 for comparison of media choices and proper use of matrix 2 for reasonable locations and justifications 1 for a chart which include planning porcesses installing jacks stringing cable and using test equipment Copyright 2004 Cisco Systems Inc Well planned oral examinations can be powerful learning experiences for students Careful preparation can minimize the intimidation that is felt by some students The models for oral exams are usually based on job interviews and graduate school oral exams A method that works particularly well for groups of diverse students is to give teams of students the exam questions answers and rubrics prior to the exam session Establish scheduled exam times which can be after school if necessary Students study and complete assessment activities in groups Then each individual member of a team enters the room alone and is asked one of the questions by the board The students do not know which question they will be asked in advance This method of oral testing usually motivates the students to study hard and with a lot of enthusiasm Examples of oral exams are found in Semester 2 Lesson Plans Instructors are encouraged to develop their own techniques for oral examinations and should use them to test for benchmark comprehension 234 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Appendix B Copyright 2004 Cisco Systems Inc B
89. CMP timestamp request The transit timestamp is filled in just before the ICMP timestamp reply is returned Originate receive and transit timestamps are computed in numbers milliseconds elapsed since midnight 00 00 Universal Time The host that originated the ICMP timestamp request can use these timestamps to estimate transit time across the network The host can subtract the originate time from the transit time to guess the transit time However this can vary widely based on traffic and congestion The host that originated the ICMP timestamp request can also estimate the local time of the remote computer This is an important concept for the students to understand Make sure that they also understand that NTP which is a UDP protocol is used to maintain the time between systems 8 2 4 Information requests and reply message formats ICMP information requests and reply messages were originally intended to allow a host to determine the number of the network it resided on However BOOTP and DHCP are now used to allow hosts to obtain the network number to which they are attached 8 2 5 Address mask requests A subnet mask is important to identify network subnet and host bits in an IP address If a host does not know the subnet mask it may send an address mask request to the local router The router responds with an ICMP address mask reply If the address of the router is known this request may be sent unicast If the address is not known the
90. Cisco SYSTEMS CCNA 2 Routers and Routing Basics v3 1 Instructor Guide This document is exclusive property of Cisco Systems Inc Permission is granted to print and copy this document for noncommercial distribution and exclusive use by instructors in the CCNA 2 Routers and Routing Basics course as part of an official Cisco Networking Academy Program I Welcome 1 238 Welcome to the CCNA 2 version 3 1 Instructor Guide Cisco Worldwide Education WWE has developed this guide to provide a helpful resource for instructors This introduction will emphasize four themes e Student centered instructor facilitated model e One size does not fit all e Hands on skills based learning e Global community of educators Student Centered Instructor Facilitated The CCNA curriculum has not been designed as a standalone e learning or distance learning course The teaching and learning model of the Cisco Networking Academy Program is based on instructor facilitation The Learner Model Academy Student diagram shows the emphasis that WWE puts on the learner The model begins with the prior knowledge of students The instructor guides learning events which are built from a variety of resources to help the students achieve their desired comprehension of networking Learner Model Academy Student CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Welcome Copyright 2004 Cisco Systems Inc One Size Does Not Fit All
91. Cisco Systems Inc The student roles within the group may be formal and assigned or informal and unassigned A formal or assigned role may be a leader a speaker a note taker a Summarizer or a timekeeper In informal groups roles may be unassigned but naturally assumed by members of the group Some group activities will not require the group members to assume any specific roles Teams A team usually has a specified purpose and consists of three to ten members The team members may be assigned as follows e Appointed e Selected by other members of the team e Grouped informally based on classroom seating arrangements e Selected alphabetically e Selected through some other random method Team members may or may not have assigned roles This depends on the performance task If there are specific roles they may be based on skill interest or necessity The end product or result of the team effort may contribute to the grades of all or individual team members Competitive teams The selection of team members for competitive team activities is similar to the previous description Each competitive team has a specific purpose They compete with other teams to determine which team can accomplish the criteria and objectives of a performance task with the most speed and accuracy The members of each team receive rubrics and criteria for the task Large groups A large group of students can be configured in a variety of ways e Smaller teams e
92. Dr Rowe s greatest contributions was to study the time between when an instructor finishes asking the class a question and when the instructor breaks the silence and prompts the class further to respond to the question Figure 1 shows a timeline At time Q the instructor finishes asking a question At time P the instructor breaks the silence either with encouragement or the correct answer Dr Rowe called the time between Q and P the wait time This concept can lead to significant improvements in student learning e The instructors who participated in the study had an average wait time of about 1 second after they asked a question and before they took further action to elicit a response Dr Rowe discovered that if the wait time was extended from about 1 212 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Appendix B Copyright 2004 Cisco Systems Inc second to beyond 3 seconds the following significant improvements in classroom dynamics occurred e Longer responses by students e More participation by more students with more confidence e Increase in student to student interactions e More questions asked e Improvements on complex assessments e Better classroom management Instructors who use question and answer techniques to teach networking should increase the wait time to see if student learning improves Instructors can read an article written by Dr Rowe to learn more about this concept Rowe M 1974
93. EC prompt Router copy running config startup config Students must understand that any changes that are made to the configuration will occur immediately These changes are made to the running configuration Students must also realize that configuration changes need to be saved to the startup configuration If they are not then they will be lost when the router is restarted Students should shut down interfaces during configuration and enable the interface after the configuration changes are completed Ask students the following questions e Which command will erase the configuration file in NVRAM e Which command will erase the configuration file in RAM e Which command will copy the RAM to NVRAM e Which command will copy the NRAM to RAM 3 1 7 Configuring an Ethernet interface An Ethernet interface can be configured from the console or a virtual terminal line By default interfaces are disabled Use the no shutdown command to enable an interface Use the shutdown command to turn off an interface if it needs to be disabled for maintenance or troubleshooting The following command is used to configure interface serial 0 0 The interface will change to up Both ends of the serial cable need to be configured for the interface to stay in an up state rtl config interface serial 0 0 rtl config if ip address 192 168 0 1 255 255 255 0 rtl config if no shutdown 00 20 46 SLINK 3 UPDOWN Interface Serial0 0 changed sta
94. Groups e Partners e Individuals e Whole class The parameters and criteria for large group discussion and participation should be established prior to the task or activity This is done so that all of the team members understand their roles and responsibilities within the group Whole class This type of group is designed to involve all of the students The parameters for participation and topic focus are clarified in advance so that all participants understand their roles and responsibilities within the class This student configuration facilitates the following activities e Teacher led discussions 209 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Appendix B Copyright 2004 Cisco Systems Inc e Student led discussions e Demonstrations e Presentations Web Links Teaching Strategies Group Work and Cooperative Learning http Awww crit umich edu tstrategies tsqwcl html Enhancing Student Thinking through Collaborative Learning ERIC Digest http Awww ericfacility net ericdigests ed422586 html 210 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Appendix B Copyright 2004 Cisco Systems Inc B 4 4 Jigsaws Figure 1 Jigsaw Puzzle The teaching and learning strategy known as the expert jigsaw was configured by Elliot Aronson in the late 1970s This strategy asks students to explore new information within the dynamics of a group setting Cooperative group skills are a prerequisite f
95. K4 0 K5 0 IGRP maximum hopcount 100 IGRP maximum metric variance 1 141 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Case Study Redistributing igrp 11 Routing for Networks V2 2 4600 Routing Information Sources Gateway Distance Last Update 172 16 64 1 100 00 00 37 Distance default is 100 Copyright 2004 Cisco Systems Inc Boaz show ip interface brief Interface IP Address OK Method Status Protocol Ethernet0 172 16 96 1 YES manual up up Serial0 172 16 64 2 YES manual up up Seriall unassigned YES unset administratively down down Boaz show version Cisco Internetwork Operating System Software IOS tm 3000 Softwar IGS J L Version 11 1 5 RELEASE SOFTWARE fcl Copyright c 1986 1996 by Cisco Systems Inc Compiled Mon 05 Aug 96 11 48 by mkamson Image text base 0x0303794C data base 0x00001000 ROM System Bootstrap Version 11 0 10c SOFTWAR ROM 3000 Bootstrap Software IGS BOOT R Versio SOFTWARE fcl P FI 11 0 10c RELEASE Boaz uptime is 5 hours 6 minutes System restarted by power on System image file is flash igs j 1 111 5 booted via flash Cisco 2500 68030 processor revision N with 6144K 2048K bytes of memory Processor board ID 22650091 with hardware revision 00000000 Bridging software SuperLAT software copyright 1990 by Meridian Technology Corp X 25 software Version 2 0 NET2 BFE and GOSIP comp
96. OT R Version 11 0 10c XB2 PLATFORM SPECIFIC RELEASE SOFTWARE fcl Centre uptime is 5 hours 18 minutes System restarted by power on System image file is flash igs j 1 111 5 booted via flash Cisco 2500 68030 processor revision D with 8192K 2048K bytes of memory Processor board ID 02782545 with hardware revision 00000000 Bridging software SuperLAT software copyright 1990 by Meridian Technology Corp X 25 software Version 2 0 NET2 BFE and GOSIP compliant TN3270 Emulation software copyright 1994 by TGV Inc 2 Ethernet IEEE 802 3 interfaces 2 Serial network interfaces 32K bytes of non volatile configuration memory 8192K bytes of processor board System flash Read ONLY Configuration register is 0x2102 Centre show host Default domain is not set Name address lookup uses domain service Name servers are 255 255 255 255 Host Flags Age Type Address es Centre perm OK 4 IP 172 16 64 1 172 16 128 1 VIZ 16 3222 Boaz perm OK 4 IP 172 16 64 2 172 16 96 1 Eva perm OK 4 IP 172 16 128 2 172 16 160 1 Centre show startup config Using 907 out of 32762 bytes version 11 1 service slave log service udp small servers service tcp small servers j hostname Centre enable secret 5 1SM1W5Swj 19efI57i0AxLPf4q0j j interface Ethernet0 description Centre LAN workgroup interface ip address 172
97. Operating System IOS e Establish communication between a terminal device and the router IOS and use IOS for system analysis configuration and repair e Identify the major internal and external components of a router and describe the associated functionality 5 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Course Overview Copyright 2004 Cisco Systems Inc e Connect router Fast Ethernet serial WAN and console ports e Perform save and test an initial configuration on a router e Configure additional administrative functionality on a router e Use embedded data link layer functionality to perform network neighbor discovery and analysis from the router console e Use embedded Layer 3 through Layer 7 protocols to establish test suspend or disconnect connectivity to remote devices from the router console e Identify the stages of the router boot up sequence and show how the configuration register and boot system commands modify that sequence e Manage system image and device configuration files e Describe the operation of the Internet Control Message Protocol ICMP and identify the reasons types and format of associated error and control messages e Identify configure and verify the use of static and default routes e Evaluate the characteristics of routing protocols e Identify analyze and show how to rectify inherent problems associated with distance vector routing protocols e Configure verify ana
98. Relation of wait time and rewards to the development language logic and fate control a part one wait time Journal of Research in Science Teaching 11 2 8l 94 b part two rewards 11 4 291 308 Many resources about different forms of wait time are also available on the Web 213 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Appendix B Copyright 2004 Cisco Systems Inc B 4 6 PMI Plus Minus Interesting Figure 1 PMI Many of the best instructional strategies help students think about their thought processes or engage in metacognition Other strategies encourage students to use knowledge in new and innovative ways There are many strategies that are currently implemented in classrooms This section will discuss three methods that are linked to easily understood instruction which encourages higher student achievement The first method is called Plus Minus Interesting PMI This practice is metacognitive and asks students to evaluate their thoughts about new information After students have read heard or interacted with new information they create a T chart The left side of the chart includes an area for items that might qualify as plus minus or interesting Students respond to the following questions in relation to specific content e What do they consider to be a Plus e What do they consider to be a Minus e What do they consider to be an interesting process comment or question St
99. S naming convention uses different fields in the name such as hardware platform identification feature set identification and the numerical release The first part of the IOS filename identifies the hardware platform The second part of the IOS filename identifies the various features that the file contains The third part of the filename indicates the file format It specifies if the IOS is stored in flash if it is in compressed format and if it can be released The fourth part of the filename identifies the IOS release This is an important concept for students to understand They should be able to look at an IOS filename and determine the hardware platform features file format and the release Students should also understand that these naming conventions vary for different releases This occurs as the feature sets are rebundled and renamed Show students some of the tools for IOS planning that are available on the Cisco website Most of these are only available to users who have obtained user ids through SmartNet http www cisco com warp customer 620 1 htm http Awww cisco com en US customer products sw iosswrel ios abcs ios networking the ent erprise0900aecd800a4e14 html CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 5 Copyright 2004 Cisco Systems Inc 5 2 3 Managing configuration files using TFTP The active configuration uses RAM and the default location for the startup configuration is NVRAM Students
100. TI Copyright 2004 Cisco Systems Inc Module 1 WANs and Routers Overview When teaching Module 1 show the students how router configuration relates to the Internet which is a global internetwork made possible by routers Students will learn the difference between WANs and LANs and will identify WAN connections encapsulations and protocols Module 1 Caution WANs will be taught in detail in CCNA 4 In CCNA 2 it is important to teach students the fundamental basics of WANs and roles that routers play in the WAN connection Inform the students that the serial interfaces will be used to simulate the DCE to DTE WAN connection Do not spend too much time on this module Students who complete this module should be able to e Identify organizations responsible for WAN standards e Explain the difference between WANs and LANs and the types of addresses they use e Describe the role of a router ina WAN e Identify internal components of a router and describe their functions e Describe the physical characteristics of a router e Identify common ports on a router e Connect Ethernet serial WAN and console ports 10 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 1 Copyright 2004 Cisco Systems Inc 1 1 WANs Essential labs None Optional labs None Core Tis All Optional Tis none Course level claim Students can identify the important characteristics of common WAN configurations and technologies differ
101. Tis have been highlighted for emphasis to assist the instructor in course and lesson planning These are not the only Tis that need to be taught Many core TIs will only make sense after the preceding Tls have been reviewed It may be useful to have a map of the core Tis which contain the most important knowledge and skills for success in the CCNA program The assessment process is multifaceted and flexible A wide variety of assessment options exist to provide feedback to students and document their learning The Academy assessment model is a blend of formative and summative assessments that include online and hands on skills based exams Hands On Skills Based The core of the CCNA 2 experience is the sequence of hands on labs Labs are designated as either essential or optional Essential labs include information that is fundamental to the CCNA Academy student experience This information will help students prepare for the certification exam succeed in job situations and develop their cognitive abilities In CCNA 2 students will learn about the following elements of basic router configuration e Hostnames banners and passwords e Interface configuration e 10S file system e Static routes and dynamic routing RIP version 1 and IGRP 2 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Welcome Copyright 2004 Cisco Systems Inc e Standard and extended access list configuration and placement e show debug ping trace and t
102. User prompt Other modes can be accessed from privileged mode to configure a router The students should have a lot of practice with hands on activities in the lab setup It is important for students to understand the various modes to be able to accurately configure a router It is not necessary to memorize all commands Students must understand each mode so they can make the configurations from the correct locations 2 2 6 Keyboard help in the router CLI 22 238 At the user mode prompt a question mark should be typed to display a list of commands available in the router From user mode the enable command will switch the router into the privileged mode If a question mark is entered from the privileged mode prompt many more commands are listed as available commands to use in the router Students should briefly review the types of commands in each mode There is no need to memorize all of the commands The context sensitive help is one of the most useful features of the IOS Teach the student that the question mark is extremely helpful in the router CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 2 Copyright 2004 Cisco Systems Inc To demonstrate the help feature instruct students to set the clock without telling them which commands to use The question mark 7 will guide students through the process 2 2 7 Enhanced editing commands Enhanced editing commands are on by default To disable enhanced e
103. Workstation 2 to Workstation 5 SUCCESSFUL Ping from Workstation 2 to Workstation 3 SUCCESSFUL Ping from Router Eva to Workstation 3 SUCCESSFUL Ping from Router Boaz to Workstation 5 SUCCESSFUL 135 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Case Study Copyright 2004 Cisco Systems Inc Phase 5 Documenting the Network In order to support the network properly documentation is required Create documentation that is logically organized to make troubleshooting simpler Configuration management documentation Boaz Center Eva show cdp neighbors show ip route show ip protocol show ip interface brief show version show hosts show startup config Security management documentation Boaz Center Eva show ip interface show ip access lists Instructor approval Date 136 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Case Study Copyright 2004 Cisco Systems Inc Case Study Deliverables The key lesson of this case study is the importance of thorough and clear documentation There should be two types of documentation completed General Documentation e Acomplete narrative of the project should be typed using word processing software Since the scenarios break up the entire task into pieces take care to address each scenario task so that any layperson could understand that particular task e Mi
104. a Telnet connection on port 23 and surf the net on port 80 at the same time Explain to the students that port numbers must be different because they represent different protocols and different sockets Emphasize the fact that sequencing and acknowledgement numbers are handled on a session by session basis Each session between hosts uses its own unique set of sequencing and acknowledgement numbers 10 2 6 Comparison of MAC addresses IP addresses and port numbers Port numbers are located at the transport layer and are serviced by the network layer The IP address is assigned at the network layer and is serviced by the data link layer that assigns the MAC address A good analogy is a letter The address on a letter consists of a name street city and state These can be compared to the port MAC and IP address used for network data The name on the envelope would be the same as the port number the street address would be the MAC address and the city and state would be the IP address Multiple letters can be mailed to the same MAC and IP address but different port numbers would be different family members living in the same household To better explain this the instructor may want to ask some questions and start a discussion e Could a protocol be routable with only Layer 3 addressing No A new frame is built as the packet is transmitted from the router interface The Layer 2 address is used for the delivery of data within the local segmen
105. al questions In this section Cisco presented some useful content tools and perspectives Ultimately instructors should decide what teaching methods are best for their students 238 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Appendix B Copyright 2004 Cisco Systems Inc
106. ality Hands on skills none 1 2 1 Introduction to WANs This section overviews the physical aspect of a router The physical layer is always studied first in networking topics The student will be able to identify internal components of the router and describe their functions describe the physical characteristics of the router identify common ports on a router and properly connect FastEthernet Serial WAN and console ports The components in a router are essentially the same as those in a computer In fact a router can be thought of as a computer designed for the special purpose of routing While the exact architecture of the router varies in different router series this section will introduce the major internal components The figures show the internal components of some of the Cisco router models Ask students the following questions e What are the common components of a router e What is NVRAM used for 1 2 2 Router physical characteristics It is not necessary to know the location of the physical components inside the router to understand how to use the router The exact components used and their locations vary in different router models 14 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 1 Copyright 2004 Cisco Systems Inc Ask students the following questions e What are the different types of RAM used by a router e Can the RAM be upgraded in a router 1 2 3 Router external connections T
107. amp Services Home Login Register Ce Learn about trends strategies and solutions that can help solve critical business problems optimize businesses and enable business productivity Discover how Cisco networking designs products and solutions can provide the quality of service availability and security thal today s Internet businesses require Learn about products and services available ontacts amp Feedback Site Help me co Search All Cisco com Toolkit SM Fl in here ta gain access to additional tools and content New User Registar now Fargo your password Click hara from Cisco and find information on product specifications documentation and troubleshooting Technologies Research the technologies that support your network infrastructure Find technical details about protocols and industry standards Ordering Cisco Minutes Teaming Up with One Economy 10 Bridge the Digital Omida Video 22 OCT 2002 Create place and manage orders for Cisco products and services Access ordering information and other support materials Technical Support Access Cisco Technical Assistance Center Cisco Honors 12 Small and TAC case management tools software Medium Sized Businesses downloads and other resources to help install configure and troubleshoot your network 22 OCT 2002 Cisco Systems Celabrates Five Years of Leadership Innevaton and Invasiment Protecton with Cisco 12000 Ser
108. ands CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 4 Copyright 2004 Cisco Systems Inc 4 2 3 Disconnecting and suspending Telnet sessions Network administrators may need to establish multiple Telnet sessions The keystroke Ctrl Shift 6 and then the letter X can be used to suspend a current Telnet session The suspend feature can be used to establish an additional Telnet session to another device The show sessions command displays a numbered list of current Telnet sessions like the following example Conn Host Address Byte Idle Conn Name 1 lab a 192 168 10 1 0 0 lab a 2 lab e 192 168 10 1 0 0 lab e A connection can be resumed by selecting the corresponding number The disconnect command will terminate a specific Telnet session The procedure for disconnecting a Telnet session is as follows e Enter the disconnect command e Follow the command with the name or IP address of the router e Example Denver gt disconnect paris The procedure for suspending a Telnet session is as follows e Press Ctrl Shift 6 and then the letter X e Enter the name of the router or IP address of the next connection Students often think that the Ctrl Shift 6 then X sequence will terminate a Telnet session They need to understand that this only suspends the session They also need to know how to resume and terminate a session 4 2 4 Advanced Telnet operation 46 238 A user may have multiple Telnet se
109. are not matched in the ACL An exercise to use with the students is to look at each line of an ACL and ask the students what each line accomplishes ACL statements are processed from the top down one line at a time until a match is made Remind students that at the end of each ACL is an implied deny all Since the statements are processed sequentially the order in which the commands are entered is extremely important Changing the order of the statements can completely change what the ACL accomplishes 1 3 Creating ACLs ACLs are created in global configuration mode When ACLs are configured on a router each ACL must be uniquely identified This is accomplished by assigning a number to it After the access list is created it must be assigned to the proper interface ACLs are assigned to one or more interfaces and can filter inbound traffic or outbound traffic with the ip access group command The ip access group command is issued in the interface configuration mode To assign an access list to an interface the direction of the traffic that the list will filter must also be defined Traffic that enters an interface is filtered with an inbound access list Traffic that leaves an interface is filtered with an outbound access list To alter an ACL that contains numbered ACL statements all the statements in the numbered ACL must be deleted with the no access list list number command The steps to configure an ACL are as follows rt1 config
110. asize the empowerment that students will gain from the ability to configure routers and the importance of familiarity with the IOS through extensive practice There are many tools available to teach IOS The curriculum text and graphics are used to introduce command syntax and context The online command references are integrated CiscoPedia is the IOS command reference in the form of a Windows help file All CCNA and CCNP commands are included Integrated e Labs provide guided practice of command syntax Standalone e SIMs provide more open ended practice of CCNA 2 level router configuration Hands on labs are integrated PDF files that should be the core of the learning experience Module 3 Caution Spend a lot of time on this module Students have wanted to program routers since the first day of CCNA 1 This module presents the core skills that the students will use to build all Cisco device configurations From this point in the CCNA 2 curriculum through the end of the CCNA 4 curriculum students may be deprived of the opportunity to learn about the IOS if the student to equipment ratio is high Only the local instructor can decide what mix of lab equipment group work creative rotations lab access remote access through NetLabs or other solutions e Labs e SIM CiscoPedia and other tools can be used to give students adequate opportunities to learn IOS After completing this module students should be able to perform the following
111. at is similar to a standard computer The router must load the IOS from one of several sources The router must also obtain a configuration file If a configuration file is not available the router will enter setup mode which prompts the user for a basic router configuration Make sure the students understand what the router needs as basic configuration information This provides a lot of information about how the router works It is very important for students to understand the difference between the IOS and the configuration file 2 2 4 Establish a console session To establish a HyperTerminal Console session students should complete the following steps 1 Connect the terminal with an RJ 45 to RJ 45 rollover cable and an RJ 45 to DB 9 or RJ 45 to DB 25 adapter 2 Configure the terminal or PC terminal emulation software for 9600 baud 8 data bits no parity 1 stop bit and no flow control Instruct the students to connect the cables from the router to the PC and to connect with the HyperTerminal program To configure a router a connection must be established between the PC and a router Make sure students understand that this is how routers need to be configured initially but it is not the only way to configure a router 2 2 5 Router login There are two levels of access to commands in a router e User EXEC mode e Privileged EXEC mode The user EXEC mode is a view only mode Enter privileged EXEC mode with the enable command from the
112. ates a ping that has timed out The traceroute command is used to view the path that packets use to reach a particular destination This is an excellent test to identify where packets are dropped in the network An asterisk indicates that the probe timed out Traceroute will continue to reach the next router in a path until the process times out or it is interrupted by the Ctrl Shift 6 escape sequence The purpose behind the traceroute command is to record the source of each ICMP time exceeded message to provide a trace of the path the packet took to reach the destination The device executing the traceroute command sends out a sequence of User Datagram Protocol UDP datagrams each with incrementing Time To Live TTL values to an invalid port address Default 33434 at the remote host First three datagrams are sent each with a TTL field value set to 1 The TTL value of 1 causes the datagram to timeout as soon as it hits the first router in the path This router then responds with an ICMP time exceeded message indicating that the datagram has expired Next three more UDP messages are sent each with the TTL value set to 2 This causes the second router in the path to the destination to return ICMP time exceeded messages This process continues until the packets reach the destination and until the system originating the traceroute has received ICMP time exceeded messages from every router in the path to the destination Since thes
113. be in one physical location In the Networking Academy lab the serial cables are connected back to back However in the real world the cables would be connected through a CSU or DCE device Discuss the differences between real networking environments and the router lab setup Help the students visualize the components between the V 35 connectors If they can understand this picture then they will realize that they are working with a complete WAN minus the carrier services 13 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 1 Copyright 2004 Cisco Systems Inc Each student should build a complete topology and then take it apart and let the next student do the lab These labs are a review of the cabling labs in CCNA 1 This may be one of the last opportunities students have to cable a network so do not miss this opportunity to make sure students complete the CCNA 2 Lab setup This is a good place to introduce troubleshooting and the Layer 1 issues that occur in CCNA 2 It is also a fairly simple and fun activity 1 2 Routers Essential Labs 1 2 5 1 2 6 and 1 2 7 Optional Labs None Core Tis All Optional Tis none Course Level Claim Students can properly connect router Fast Ethernet Serial WAN and console ports Certification Level Claim Students can describe the components of network devices They can also identify the major internal and external components of a router and describe the associated function
114. ble lists variations of the CDP command and their functions These commands should be used in privileged EXEC mode The table is located in this section of the curriculum Although not noted in the curriculum many of these commands can be executed in user mode Some of the configuration commands are done in global configuration mode and some require interface configuration mode Discuss the cdp enable and cdp run commands The cdp enable command is an interface configuration command that enables CDP on a particular interface The cdp run command is a global configuration command that enables CDP on a Cisco device Students should also be comfortable with the no form of these commands Relevant Tis from CCNA 2 v2 1 4 are 4 3 3 and 4 3 4 Demonstrate command usage after the class reviews the table Command Purpose cdp enable cdp advertise v2 clear cdp counters show cdp show cdp entry entry name protocol version show cdp interface type number show cdp neighbors type number detail Enables CDP on an interface Enables CDP Version 2 on an interface Resets the traffic counters to zero Displays the interval between transmissions of CDP advertisements the number of seconds the CDP advertisement is valid for a given port and the version of the advertisement Displays information about a specific neighbor which can be limited to protocol or version information Displays information about interfaces on which CDP
115. c routes with RIP How to verify RIP configuration IGRP features IGRP metrics IGRP routes IGRP stability features How to configure IGRP 91 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 7 Copyright 2004 Cisco Systems Inc e How to migrate RIP to IGRP e How to verify IGRP configuration e How to troubleshoot IGRP 92 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 7 Copyright 2004 Cisco Systems Inc Module 8 TCP IP Suite Error and Control Messages Overview 93 238 The main goal of Module 8 is for students to learn how the IP protocol uses the ICMP protocol to provide control messages to hosts on a network IP does not have the facilities to send error messages It uses ICMP to send receive and process error and control messages Module 8 Caution Error and control messaging is an important aspect of TCP IP Make sure the students understand that ICMP is the protocol that handles these functions for the TCP IP suite If time is an issue this module can be used as a reference for other modules when students encounter different ICMP error messages in their labs and in their use of programs such as browsers and e mail Students who complete this module should be able to perform the following tasks Describe ICMP Describe the ICMP message format Identify ICMP error message types Identify potential causes of specific ICMP error messages Describe ICMP control
116. can occur where datagrams travel in a circle and never reach their destination This could occur because no path exists between a source and a destination that conforms to the requirements of the routing protocol This could be caused by incorrect routing information Explain that paths with too many hops and circular paths create an excessively long route The packet will eventually reach the end of its life known as time to live TTL The TTL is not related to the hop count value of RIP RIP advertisements are broadcast That means they will not go farther than the local segment The reachability of RIP is controlled by the routing protocol It maintains a hop count metric that cannot exceed 15 This means that a route will not be advertised further than 15 hops It does not mean that packets cannot travel more than 15 hops The process is as follows 1 As each router processes the datagram the TTL value decreases by one 2 When the TTL value reaches zero the packet is discarded CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 8 Copyright 2004 Cisco Systems Inc 8 1 7 Echo messages ICMP message formats have three fields e Type e Code e Checksum The type field indicates the type of ICMP message that is sent The code field includes additional information that is specific to the message type The checksum field is used to verify the integrity of the data Create an example to help students understand this format Thi
117. ccie 236 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Appendix B Copyright 2004 Cisco Systems Inc B 5 7 Six lenses Six Lenses Equity Curriculum Teaching Learning Assessment Technology Figure 1 Six Lenses In any learning endeavor certain lenses are indispensable to ensure a high quality experience for students There are six different perspectives that are supported in the Academy courses Equity Curriculum Teaching Learning Assessment Technology It is important to ask questions about these factors in all Academy curriculums The following example uses UNIX Equity Do all Academy students have adequate access to information about UNIX Curriculum Do the online curriculum and skills based labs provide ample opportunities for students to learn about UNIX Teaching Do all Academy students have access to instructors who use instructional best practices to teach UNIX Learning Do students have adequate resources to construct their own iterative comprehension of UNIX Assessment Do all students have access to online and skills based formative and summative assessments Technology What technologies enable the effective teaching of UNIX 237 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Appendix B Copyright 2004 Cisco Systems Inc As instructors work through this orientation they are encouraged to revisit these essenti
118. ce is configured to verify the changes and that the interface is operational View these results with the students and discuss the results to make sure they understand the output This is an important concept and valuable tool for troubleshooting The students are not expected to understand all the fields contained in the show interfaces command output This command will be revisited in CCNA 4 and more information will be presented 9 3 3 Troubleshooting using show cdp CDP advertises device information to its direct neighbors that includes MAC and IP addresses and outgoing interfaces The output from the show cdp neighbors command displays information about directly connected neighbors This information can be used to debug connectivity issues The show cdp neighbor detail command returns specific device details such as the active interfaces the port ID and the device The version of Cisco IOS that is used on the remote devices is also shown 107 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 9 Copyright 2004 Cisco Systems Inc This is an important concept for the students to understand to help in the troubleshooting process Two important facts for the students to learn are that CDP is Cisco proprietary which means that it only works between Cisco devices and that CDP only works between directly connected devices 9 3 4 Troubleshooting using traceroute The traceroute command is used to discover the route
119. ce standards to add value to the organization Students need to understand why standards are important and begin to apply them in the lab Encourage students to create and use standards Remember to simulate real world environments in the classroom and lab A centralized support standard is necessary to manage a network Configuration security performance and other issues must be adequately addressed for the network to function properly The creation of standards for network consistency helps reduce network complexity the amount of unplanned downtime and exposure to network impacting events Emphasize that there should be a standard for everything and that each standard should be a written part of the documentation and procedures These should include how configuration files are named how interfaces are addressed and the description used on interfaces The use of these standards is very important for troubleshooting Explain to students that the same network associate will not always troubleshoot the network device If the previous CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 3 Copyright 2004 Cisco Systems Inc associate did not have or follow standards then the next associate will need to analyze how the device is supposed to be connected or configured For example if the headquarters router always has the lowest address in a subnet configured and the remote office uses the next address up then there is no ques
120. cols and autonomous systems The classes of routing protocols Distance vector routing protocol features and examples Link state protocol features and examples Route determination Routing configuration RIP IGRP OSPF EIGRP and BGP routing protocols Autonomous systems and IGP versus EGP Distance vector routing Link state routing 74 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 6 Copyright 2004 Cisco Systems Inc Module 7 Distance Vector Routing Protocols Overview 75 238 When teaching module 7 emphasize both skills development and conceptual understanding of the routing protocols RIP and IGRP Students must master the basic routing skills and concepts from this module to be successful in CCNA 3 Before students begin this section they should be able to connect to Cisco routers and switches with serial or Ethernet cables console and Telnet into a router and configure TCP IP on router interfaces Module 7 Caution Many students do not have prior experience with routing protocols Encourage the students to spend plenty of time in the labs and to experiment with RIP Since the labs are complex students may require additional time which may affect the availability of lab equipment Provide guidance on how to follow an effective well documented and patient troubleshooting strategy since students may need to troubleshoot their labs If the lab IOS does not support IGRP instructors should use EIGRP an
121. crosoft Excel or another spreadsheet program could be used to simply list the equipment and serial numbers e Cisco Network Designer CND Microsoft Visio or any paint program could be used to draw the network e Provide documentation that specifies how the security was tested A plan for monitoring the network should also be included Technical Documentation The technical documentation should include details of the network topology Use CND Visio or any paint program to draw the network Use the tables in the working copy of the case study as a reference and enter all table information into a spreadsheet program such as Microsoft Excel The spreadsheet should include the following details e IP addressing of all interfaces e DCE DTE information e Router passwords e Interface descriptions e P addressing and gateway assignments for all PCs The actual access control lists or router commands sequence should be included in this documentation using a word processing program Be sure to include the router interface the list is applied to and the direction Document the use of a routing protocol Router output from the following commands should be captured and placed into this documentation e show cdp neighbors e show ip route e show ip protocol 137 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Case Study Copyright 2004 Cisco Systems Inc e show ip interface e show version e show hosts e s
122. d From global configuration mode use the enable password command to restrict access to the privileged mode The line configuration mode can be used to establish a login password on the console terminal Use the command line vty 0 4 to establish a login password on incoming Telnet sessions CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 3 Copyright 2004 Cisco Systems Inc Discuss the differences between the various passwords Students need to understand when each password is used If students ask if user ids and passwords can be used instead of just passwords the answer is that they can but that is beyond the scope of this course Ask students the following questions e What is the command to set the enable password e What is the command to set the telnet password e What is the command to set the console password 3 1 4 Examining the show commands 30 238 There are many show commands which are used to examine the contents of files in the router and for troubleshooting From each mode in the router the show command can be used to see all the available options Some of the show command options are as follows e show interfaces e show controllers serial e show clock e show hosts e show users e show history e show flash e show version e show ARP e show protocol e show startup configuration e show running configuration Students may want to use the show running config command as their primar
123. d emphasize how it is similar to IGRP EIGRP is covered in CCNA 3 Students who complete this module should be able to perform the following tasks e Describe how routing loops can occur in distance vector routing e Describe several methods used by distance vector routing protocols to ensure that routing information is accurate e Configure RIP e Usethe ip classless command e Troubleshoot RIP e Configure RIP for load balancing e Configure static routes for RIP e Verify RIP e Configure IGRP e Verify IGRP operation e Troubleshoot IGRP CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 7 Copyright 2004 Cisco Systems Inc 7 1 Distance Vector Routing Essential Labs None Optional Labs None Core Tis All Optional Tis none Course Level Claim Students can identify analyze and show how to rectify inherent problems associated with distance vector routing protocols Certification Level Claim Students can troubleshoot and configure routing protocols based on user requirements Hands on skills none 7 1 1 Distance vector routing updates Distance vector routing protocols require routers to forward their entire routing table when passing along updates Convergence is a step by step process with distance vector routing protocols This means that routing table information is forwarded to neighbor routers which continue to forward the information to their neighbors This is contrasted with link state routi
124. d help on specific tasks but do not assume that they do The students will ask for help if they need it Use contrasting light and dark colors to help students differentiate between cables and routers Use proper lighting in all areas of the lab to help students see more effectively Provide pocket or lighted magnifiers for reading to assist students with low vision Provide hats or visors to reduce the glare that is associated with many vision disorders Use bold lines and write in large print when information is taught or presented Encourage all students especially those that are visually impaired in the classroom If feelings of hopelessness or fear occur a social worker or special teacher of the visually impaired may be called in to help these students cope with their learning environment When there are hearing impaired students in a classroom here are some general considerations to keep in mind Make sure the labs are well lighted so the speaker can be clearly seen 176 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Appendix B Copyright 2004 Cisco Systems Inc Be sensitive to background noise in the lab Turn radios cell phones and televisions off during work times If background noise is unavoidable with online learning instruct hearing impaired students to use ear phones to keep extraneous noise to a minimum Get close to the students when speaking Stress the importance of only one person tal
125. d on an interface to make a comment e Which type of information may be included in a description 3 2 3 Configuring an interface description 34 238 To configure an interface description enter global configuration mode From global configuration mode enter interface mode Use the following steps 1 Enter global configuration mode with the configure terminal command 2 Enter a specific interface mode such as interface ethernet 0 3 Enter the description command followed by the information to be displayed For example XYZ network Building 10 4 Exit interface mode and return to global configuration mode by pressing Ctrl Z Save the configuration changes to NVRAM with the copy running config startup config command Important concepts for students to understand are that each description is for a particular interface and the description is entered in interface configuration CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 3 Copyright 2004 Cisco Systems Inc Ask students the following questions e Which configuration mode is used to enter the description e What are the commands to add a description to an interface 3 2 4 Login banners Students must realize that a login banner can be seen by anyone This login banner should be a warning that users should not attempt to log in unless they are authorized A message such as This is a secure system authorized access only instructs unwanted in
126. d the last route update e show ip route e show ip route network e show ip protocols e show ip rip database Stress the importance of these commands Use examples to show the students the information generated by these commands 104 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 9 Copyright 2004 Cisco Systems Inc 9 1 9 Observing multiple paths to destination Some routing protocols support multiple paths to the same destination Multipath algorithms permit traffic over multiple lines provide better throughput and are more reliable Discuss with the students their ideas on why it would be better to have multiple paths through the network Discuss redundancy and reasons why all networks are not redundant 9 2 Network Testing Essential Labs 9 2 6 Optional Labs None Core Tis All Optional Tis none Course Level Claim Students can use embedded Layer 3 through Layer 7 protocols to establish test suspend or disconnect connectivity to remote devices from the router console Certification Level Claim Students can describe network communications in layered models perform simple LAN troubleshooting and use the OSI model as a guide for systematic network troubleshooting Hands on skills none 9 2 1 Introduction to network testing Basic testing of a network should move through each layer of the OSI reference model Begin with Layer 1 and work to Layer 7 if necessary Instruct the students to look fo
127. ddenly left the company This left redesign and implementation on this portion of the internetwork unfinished A technician is given the task to complete the design and implementation of the unfinished network After taking home the documentation to study over the weekend it is apparent to the technician why the network associate left suddenly The few documents that existed were poorly written So during the weekend the technician reconstructs the diagram above from an existing diagram that was found It represents the new internetwork design It shows the planned routers hubs switches circuits and the servers workstations at each site The server at the Center site is a file server accessed only by workstations on this internetwork The workstation at the Center site is used to manage all routers on the internetwork After returning to work Monday morning the technician presents the new diagram to the Network Infrastructure Team Leader that assigned the project After discussion it is determined that new documentation must be developed for the project The Team Leader the instructor must approve the documentation at each phase of the process Use the following information to implement the network Network address Required number of subnets Routing protocol 131 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Case Study Copyright 2004 Cisco Systems Inc Phase 2 IP Addressing Now that the basic plan i
128. dents who work individually will go through the same process without any team direction and input These students will make their own decisions about the relevancy of information They will rely on their peers and other data sources to determine which information is most useful During this time the teacher will assume a role that is different from the provider of skills and knowledge The instructor will become a facilitator of learning As students become immersed in their questions and desire to learn teachers can ask essential questions to support thinking and exploration As students struggle with challenges teachers can introduce problem solving strategies and encourage students to work through what is perceived to be a difficult situation As students master the course content teachers can introduce the next level of challenge Web Links Pedagogical Application of Technology A Consortium for Change http courses temple edu ta contructivist htm B 1 6 Multiple intelligences Verbal Linguistic Logical Mathematical Bodily Kinesthetic Musical Rhythmic Visual Spatial Intrapersonal Interpersonal Naturalist Figure 1 Multiple Intelligences The research of Howard Gardner provides great insight into how students learn Students learn in different ways There are multiple skills that go beyond the traditional verbal and mathematical abilities that are required to master new learning According to Gardner the
129. dents with Learning Disabilities http www as wvu edu scidis learning html 179 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Appendix B Copyright 2004 Cisco Systems Inc B 2 Lab Centric Instruction B 2 1 CCNA labs The CCNA curriculum teaches students how to plan design install operate and troubleshoot TCP IP Ethernet routed and switched networks with some remote connectivity The CCNA curriculum consists of four courses e Networking Basics e Routers and Routing Basics e Switching Basics and Intermediate Routing e WAN Technologies The curriculum is lab intensive Approximately 50 percent of all class time is spent on lab exercises The required lab equipment for CCNA 1 includes workstations hubs switches a variety of cable making and cable testing tools and cable installation materials CCNA 1 students acquire lab skills that enable them to perform the following tasks e Configure networking properties on workstations e Make and test patch cables e Install and test cable runs jacks and patch panels The required lab equipment for CCNA 2 includes workstations hubs switches and routers CCNA 2 students acquire lab skills that enable them to perform the following tasks e Interconnect networking devices e Use the Cisco Internet Operating System IOS to configure and test routers e Build and troubleshoot a five router network The required lab equipment for CCNA 3 includes workstations
130. distance vector routing protocols Several of the topics will be discussed later in the RLO It may be helpful to discuss related concepts such as holddown timers route poisoning and triggered updates in a combined lesson with the entire class Group discussions about how these features fit together to help prevent routing loops may be helpful to students 7 2 RIP Essential Labs 7 2 2 7 2 6 7 2 7 and 7 2 9 Optional Labs None Core Tis All Optional Tis none 81 238 Course Level Claim Students can configure verify analyze and troubleshoot simple distance vector routing protocols Certification Level Claim Students can troubleshoot and configure routing protocols based on user requirements Hands on skills none CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 7 Copyright 2004 Cisco Systems Inc 7 2 1 RIP routing process RIP is a distance vector routing protocol that uses hop count as the metric for path selection By default the maximum hop count for RIP is 15 and routing updates are broadcast every 30 seconds If RIP routes are received that would increase the metric to a number higher than 15 hops the network is considered unreachable and the route is discarded RIP also has other features that are used by distance vector routing protocols such as split horizon and hold down mechanisms to prevent incorrect routing information from being propagated 7 2 2 Configuring RIP Basic RIP configuration
131. diting mode the terminal no editing command can be used at the privileged mode prompt The editing command set provides a horizontal scrolling feature for commands that extend beyond a single line When the cursor reaches the right margin the command line shifts ten spaces to the left The first ten characters of the line cannot be seen but a user can scroll back to check the syntax It is represented by a dollar sign Some of the editing commands are as follows e Ctrl A moves to the beginning of the command line e Ctrl B moves back one character e Ctrl E moves to the end of the command line e Ctrl F moves forward one character e Ctrl Z moves back out of configuration mode e Esc and then B moves back one word e Esc and then F moves forward one word The syntax of IOS commands can be complex Keyboard editing features can be used to correct text that has been entered When a router is being configured repetitive command statements typing errors that need to be fixed and commands that need to be reused may be encountered Questions about the Ctrl key and Esc key sequences will probably appear on the CCNA exam 2 2 8 Router command history 23 238 The user interface provides a history of commands that have been entered This feature can be used to recall long or complex commands The command history feature can be used to complete the following tasks e Set the command history buffer size e Recall commands e Disable
132. dshake e Denial of service attacks e Windowing and window size e Sequencing numbers e Positive acknowledgement and retransmission PAR e UDP operation e Multiple conversations between hosts e Ports for services e Ports for clients e Port numbering and well known ports e Example of multiple sessions between hosts e Comparison of MAC addresses IP addresses and port numbers 118 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 10 Copyright 2004 Cisco Systems Inc Module 11 Access Control List ACLs Overview When teaching Module 11 emphasize the importance of access control lists ACLs Network administrators must establish a way to deny unwanted access to a network and allow internal users to access necessary services Security tools such as passwords callback equipment and physical security devices are helpful However they often lack the flexibility of basic traffic filtering and the controls most administrators prefer ACLs will be used for many aspects of networking These include security dial on demand routing and all types of route filtering techniques Quality of Service routers provide basic traffic filtering capabilities such as the use of ACLs to block Internet traffic An ACL is a sequential list of permit or deny statements that apply to addresses or upper layer protocols Module Caution It may be difficult for students to understand the concept of ACLs This topic will require additional t
133. due in 50 seconds Invalid after 270 seconds hold down 280 flushed after 630 Outgoing update filter list for all interfaces is not set Incoming update filter list for all interfaces is not set Default networks flagged in outgoing updates Default networks accepted from incoming updates IGRP metric weight Kl 1 K2 0 K3 1 K4 0 K5 0 IGRP maximum hopcount 100 IGRP maximum metric variance 1 Redistributing igrp 11 Routing for Networks 17252 16 2 0 0 Routing Information Sources Gateway Distance Last Update LIZ 6 12822 100 00 40 35 172 16 64 2 100 00 01 07 Distance default is 100 Centre show ip interface brief Interface IP Address OK Method Status Protocol Ethernet0 L72163 Arl YES manual up up Ethernet1 unassigned YES unset administratively down down Serialo0 172 16 64 1 YES manual up up Seriall 172 16 128 1 YES manual up up 146 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Case Study Copyright 2004 Cisco Systems Inc Centre show version Cisco Internetwork Operating System Software IOS tm 3000 Softwar IGS J L Version 11 1 5 RELEASE SOFTWARE fc1 Copyright c 1986 1996 by Cisco Systems Inc Compiled Mon 05 Aug 96 11 48 by mkamson Image text base 0x0303794C data base 0x00001000 ROM System Bootstrap Version 11 0 10c XB2 PLATFORM SPECIFIC RELEASE SOFTWARE fcl ROM 3000 Bootstrap Software IGS BO
134. e Since IP does not guarantee delivery it has no method to inform hosts when errors occur e IP has no built in method to provide information or control messages to hosts e ICMP is necessary to perform these functions for IP Explain to the students that unlike error messages control messages are not the result of lost packets or error conditions Instead they are used to inform hosts of conditions such as network congestion or the existence of a better gateway to a remote network Like all ICMP messages ICMP control messages are encapsulated 8 2 2 ICMP redirect change requests 97 238 An ICMP redirect change request can only be initiated by a gateway which is commonly used to describe a router All hosts that communicate with multiple IP networks must be configured with a default gateway This default gateway is the address of a router port connected to the same network as the host Normally there is a single gateway In some circumstances a host can connect to a segment that has two or more directly connected routers In these situations the default gateway may need to use a redirect change request to inform the host of the best path Explain this concept with the students and make sure they understand this important process Default gateways only send ICMP redirect change requests if the following conditions are met e The interface on which the packet comes into the router is the same interface on which the packet gets routed ou
135. e and Software which is sponsored by Hewlett Packard Company presents an in depth exposure to computer hardware and operating systems Students learn the functionality of hardware and software components and the suggested best practices for maintenance and safety issues Students learn how to assemble and configure computers install operating systems and software and troubleshoot hardware and software problems through hands on activities and labs An introduction to networking is also included This course helps students prepare for the CompTIA A certification exam This is designed as a 70 hour course However it addresses a broad range of topics that might benefit from a longer delivery model IT Essentials Network Operating Systems Network Operating Systems which is sponsored by Hewlett Packard Company is an extensive introduction to multiuser multitasking network operating systems NOSs This course will discuss the characteristics of the Linux Windows 2000 NT and XP NOSs Hands on labs will utilize the Windows 2000 and Linux NOSs Students will explore a variety of topics such as installation procedures security issues back up procedures and remote access This is a 70 hour course Fundamentals of Voice and Data Cabling Fundamentals of Voice and Data Cabling which is sponsored by Panduit is designed for students interested in the physical aspects of voice and data network cabling and installation The course focuses on cabling iss
136. e assessment options include the end of module online quiz in the curriculum and the online Module 11 exam Formative assessments such as short paper quizzes that instruct students to write out an access list in response to a scenario may help students achieve mastery Students should understand the following main points ACLs perform several functions within a router which includes the implementation of security access procedures ACLs are used to control and manage traffic For some protocols two ACLs can be applied to an interface an inbound ACL and an outbound ACL After a packet is matched to an ACL statement it can be denied or permitted access to the router Wildcard mask bits use the number one 1 and the number zero 0 to identify how to treat the corresponding IP address bits Access list creation and application is verified through the use of various IOS show commands The two main types of ACLs are standard and extended Named ACLs allow access lists to be identified by names instead of numbers ACLs can be configured for all routed network protocols ACLs are placed where they allow the most efficient control ACLs are typically used in firewall routers Access lists can also restrict virtual terminal access to the router 129 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 11 Copyright 2004 Cisco Systems Inc IV Case Study Overview and Objectives This case study allows
137. e datagrams are trying to access an invalid port Default 33434 at the destination host the host responds with ICMP port unreachable messages indicating an unreachable port This event signals the traceroute program to finish The show ip route command is used to identify the routes that are shown in the routing table These are routes to directly connected networks networks with static routes or networks that have been learned through a routing protocol Due to many security configurations throughout the Internet ping and trace may not always work to test connectivity through networking equipment outside of your control Many firewalls and access lists today do not allow ICMP traffic CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 4 Copyright 2004 Cisco Systems Inc The procedure to use the ping command is as follows e ping IP address or name of destination e Press Enter The procedure to use the trace command is as follows e trace IP address or name of destination e Press Enter Demonstrate a successful ping LAB Bi ping lab c Typ scape sequence to abort Sending 5 100 byte ICMP Echoes to 199 6 13 2 timeout is 2 seconds Success rate is 100 percent 5 5 round trip min avg max 32 35 36 ms Demonstrate an unsuccessful ping LAB D ping lab c Typ scape sequence to abort Sending 5 100 byte ICMP Echoes to 199 6 13 2 timeout is 2 seconds Success rate
138. e lessons or LOs Modules are also referred to as chapters e Learning objective LO A statement that establishes a measurable behavioral outcome LOs are used to organize content and to indicate how the acquisition of skills and knowledge will be measured LOs are also referred to as terminal objectives or RLOs e Lesson A set of Tls or enabling objectives that are grouped together and presented in a coherent format to meet an LO or terminal objective Lessons emphasize the role of the instructor Learning objectives emphasize the role of the students e Module caution Suggestions related to areas where difficulties may be encountered These are especially important for syllabus development lesson planning and pacing e Optional lab A lab that is for practice enrichment or differentiation e Essential lab A lab that is fundamental to the course e Reusable Learning Object RLO This is a Cisco Instructional Design term RLOs typically consist of five to nine RIOs In this guide RLOs are equivalent to lessons or learning objectives e Reusable Information Object RIO This is a Cisco Instructional Design term In this guide RIOs are equivalent to target indicators e Target indicator TI Tis are also referred to as enabling objectives or RIOs Tls typically consist of a text frame with graphics and several media content items 9 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Teaching Guide TI by
139. e sending and receiving devices must have the TCP IP protocol configured e This includes a correct IP address and subnet mask e A default gateway must be set if data will go outside the LAN e Devices must be place to route the data e The router must be configured correctly and the correct routing protocol must be used lf these conditions are not met communication cannot occur Instruct the students to discuss problems that could cause a network to be unreachable 8 1 5 Using ping to test destination reachability The ICMP protocol can be used to test the availability of a destination If a destination receives the ICMP echo request it formulates an echo reply to send back to the source If the sender receives the echo reply this confirms that the destination can be reached The process is initiated with the ping command Have the students do an exercise on the ping procedure Discuss the use of the DNS function Explain that the DNS must be available to use a domain name instead of an IP address when the ping command is used Also point out that a way to check the function of DNS is to ping the same destination by domain name and by IP address If the remote location responds to the IP address but not to the domain name then this indicates a DNS issue Explain that a location may be unreachable because of security restrictions ICMP may be a blocked protocol 8 1 6 Detecting excessively long routes 95 238 Situations in a network
140. each student should be capable of deciding on IP addresses of interfaces after the IP scheme has been chosen The Network Diagram IP Addressing on page 4 is the first document that should be approved by the instructor Phase 2 IP Addressing This Phase of the case study should be due after module 4 or 5 is completed Students should recreate the drawing during this Phase using CDN Visio or a paint program In the drawing the students should be advised to insert the appropriate interface connections on the routers The drawing should be approved by the instructor The following topics can be used for class discussion e The reasons for using private IP addressing 139 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Case Study Copyright 2004 Cisco Systems Inc e The concept of reserved address space for routers servers and hosts e The reasons for developing an IP address scheme to allow for future growth Phase 3 Basic Router and Workstation Configuration This Phase should be completed after students feel comfortable with basic router configuration sometime after Module 7 Students should be somewhat familiar with router configuration and understand the basic requirements The checklist included in Phase 3 will help them to include the essential items for router configuration The student should select which workstation is to be the TFTP server They must understand which devices need access to the TFTP serv
141. ed an agreement about the meaning of two significant concepts academic content standards and performance standards which were later published in the Goals 2000 Act Educational standards are important in all countries The Academy program can be tailored by region by country and by curriculum to achieve alignment with international educational standards 169 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Appendix B Copyright 2004 Cisco Systems Inc Web Links National Council for Teachers of English http Awww ncte org standards standards shtml Council for Teachers of Math http Avwww nctm org National Science Teachers Association http www nsta org American Association for the Advancement of Science htto www aaas org The National Academy of Science http www nas edu National Research Council NRC http www nrc cnrc gc ca 170 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Appendix B Copyright 2004 Cisco Systems Inc B 1 4 TIMSS report Participating Countries Australia New Zealand Belgium Flemish Phillippines Bulgaria Romania Canada Russian Federation Chile Singapore Chinese Taipei Slovak Republic Cyprus Slovenia Finland Macedonia Rep of Tunisia Pf Morocoo Netherlands Figure 1 TIMSS Report Participating Countries The Third International Mathematics and Science Study TIMSS indicate how U S students perform academically in comparison
142. ed from the router by issuing the command erase startup configuration Use the reload command to restart the router HyperTerminal can be used to restore the configuration e Enter global configuration mode e Select Transfer gt Send gt Text File in HyperTerminal e Select the name of the file e Read the lines of the file as they are entered into the router e Observe for any errors e Press Ctrl Z to exit global configuration mode after the configuration file is entered e Usethe copy running config startup config command to restore the startup configuration file Students must understand each of the procedures A backup configuration file is necessary for any network administrator Explain that minimal down time is required in any network 57 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 5 Copyright 2004 Cisco Systems Inc Discuss the difference between running configuration and startup configuration This concept is very important Also stress the benefits of comments in the configuration These comments can explain the function of the various commands Make sure that the students know that these comment lines begin with an exclamation point and that these lines are not stored in the router Some features of HyperTerminal do not work well with the version of HyperTerminal that comes with Windows XP A free educational upgrade to HyperTerminal 6 3 can be downloaded from the following website
143. eliability Since the UDP header is smaller than the TCP header UDP has less overhead 114 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 10 Copyright 2004 Cisco Systems Inc UDP is often used for applications and services such as real time audio and video These applications require less overhead They also do not need to be resequenced since packets that arrive late or out of order have no value 10 2 Overview of Transport Layer Ports Essential Labs 10 2 5 Optional Labs None Core Tis 10 2 5 Optional Tls 10 2 1 10 2 4 and 10 2 6 Course Level Claim Students can describe the operation of the major transport layer protocols and the interaction and transportation of application layer data Certification Level Claim Students can evaluate TCP IP communication process and the associated protocols Hands on skills none 10 2 1 Multiple conversations between hosts At any given moment thousands of packets destined for hundreds of different services travel through a network Servers provide services for a multitude of different requests This causes unique problems for addressing of packets For example if a server uses SMTP and WWW services a client cannot construct a packet that is destined for just the IP address of the server with TCP because both SMTP and WWW use TCP as their transport layer protocol A port number must be associated with the conversation to ensure that the packet reaches the app
144. elligence provides a confidence in oneself that allows a student to process new information through thought and reflection Strong intrapersonal intelligence indicates a strong personal connection to feelings and emotions which can take a student to a higher level of consciousness in learning e Interpersonal intelligence allows a student to accurately perceive the emotions feelings motivations and intentions of others Strong interpersonal intelligence indicates a strong team player mentality A student with this strength will work thoughtfully within group settings e Naturalist intelligence allows students to recognize natural phenomenon such as flora and fauna soil and land weather and environmental issues These students easily make choices related to issues such as survival in the wild or the proper clothing for different weather conditions Gardner believes that all individuals have strength in one or more of these intelligences and they will follow a changing pattern of strength that depends on their stages of human life and circumstances For student achievement to be maximized the Cisco Networking Academy Program encourages instructors to identify the intelligence that best reflects the learning style of individual students Web Links Project Zero http www pz harvard edu 174 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Appendix B Copyright 2004 Cisco Systems Inc B 1 7 Inquiry based learning
145. elnet commands to verify and troubleshoot Global Community WWE instructors are members of a global community of educators There are over 10 000 instructors that teach the same eight CCNA and CCNP courses in the program Instructors should take advantage of the diversity and skills of this community through their Regional Academies Cisco Academy Training Centers CATCs the Cisco Academy Connection CAC or through other forums WWE is committed to the improvement of the curriculum assessment model and instructional resources such as this guide Please submit any feedback through CAC Check CAC for new releases of instructional materials Guide Overview Section II provides a scope and sequence overview of the course Section III summarizes the most important learning objectives target indicators and labs and offers teaching suggestions and background information Section IV provides a case study related to network design implementation and troubleshooting Instructors can also devise their own case studies Section V includes four appendices e Cisco online tools and utilities e CCNA assessment guidelines e Evidence centered design of assessment tasks in the Networking Academy program e Instructional best practices 3 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Welcome Copyright 2004 Cisco Systems Inc Il Course Overview Target Audience The target audience is anyone who desires a practical and technica
146. ely identify and troubleshoot common problems that involve hardware configuration and performance issues These solutions which are provided directly by TAC engineers help resolve networking problems http Awww cisco com kobayashi support tac tsa launch_tsa html 163 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Appendix A Copyright 2004 Cisco Systems Inc 7 Software Advisor Close Window Toolkit Roll over Cisco SYSTEMS Se Feedback Help SOFTWARE SUPPORT FOR FEATURES SOFTWARE SUPPORT FOR HARDWARE Want to try out what s new in Software Advisor If you have one of the following supported products Switch Series 4000 4500 5000 5500 6000 6500 YOU Can tryit now For each entry point below you have the option to search for applicable software bugs using the Bug Toolkit Software Support for Features Search by Features Create your list of Cisco IOS or CatOS features What software releases support them Search by Release Select your Cisco IOS or CatOS release Which software features does it support Compare Releases Select two Cisco IOS releases Which software features are unique to each and which do they have in common Software Support for Hardware Cisco 10S PIX OS or WAN Switching Supported Hardware Create a list of hardware products Which minimum software releases are compatible with it CatOS Supported Hardware Populate your Catalyst chassis with CatOS hardware Wh
147. entiate between these and common LAN technologies and describe the role of a router in a WAN Certification level claim Students can evaluate the important characteristics of WANs and implement simple WAN protocols Hands on skills none 1 1 1 Introduction to WANs WANs differ from LANs in several ways e LANs connect workstations peripherals terminals and other devices in a single building or several buildings that are located next to each other and WANs connect large geographic areas e LANs connect devices and WANs connect data connections across a broad geographic area WANs operate at the physical and data link layers of the OSI model Devices used in a WAN are routers switches modems and communication servers The following topics are relevant to this TI e Discuss the various carriers and devices available for WAN connections e Show students what routers in a WAN look like e Explain what routers do Figure 3 is an important figure to review Best instructional practices for this TI include online study sessions with study guides group work and mini lectures This Tl provides essential background information for the CCNA exam 1 1 2 Introduction to routers ina WAN Routers and computers have four basic common components e CPU e Bus 11 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 1 Copyright 2004 Cisco Systems Inc e Memory e Interfaces However the main purpose of a router
148. er SCC Find with all of the words with the exact phrase with atleast one of the words without the words use one or more of these fields m m m Networking Professionals Connection Products amp Services Technical Support Services Introduction Learning amp Events TAC Training Resources Type of File All TAC Document Types C Case Studies Configuration Examples C Field Notices C Networking Solutions C Password Recovery QandAs Security Advisories Tech Notes White Papers Technologies Report Product Security Incident m Results per page 10 C25 C100 TAC Advanced Search can be used to access the same resources used by TAC Users can search the entire TAC database for technical documents published by the Cisco TAC for TAC technical support tools for documents that are located on http www cisco com or for entries in the Networking Professionals Connection discussion forums http Avww cisco com kobayashi support tac s_tac shtml 166 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Appendix A Copyright 2004 Cisco Systems Inc Appendix B Instructional Best Practices B 1 Definition of Best Practices B 1 1 What is meant by best practices Figure 1 Best Practices Since the early 1980s schools have explored the use of technology as an effective tool for teaching and learning in the classroom Curre
149. er Students should be guided to complete the chart in Phase 3 and then have the instructor approve the configuration After instructor approval students should enter their configurations and test them on the routers Phase 4 Access Control Lists This Phase should be completed after Module 11 This is a most critical portion of the case study Students must develop an access control list on paper first then type the ACL into a word processing application The instructor should guide the students through the process of copying and pasting ACLs into the router configuration Phase 5 Documenting the Network If the documentation requirements are clear to the students at the beginning of the case study the final Phase will have been completed throughout the life of the case study The Phase will help to reiterate the purpose of documentation that it should be done continually and revisited not only once During the last phase the deliverables list should be discussed again to make sure the student understands the requirements Optional An additional Phase could be a reflection phase so that the student can look objectively at this case study Questions might include Why have two types of documentation What happens when a piece of equipment fails and so forth 140 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Case Study Copyright 2004 Cisco Systems Inc Case Study Instructor Sample Out
150. er is the first number listed In some instances it may necessary to avoid the advertisement of routing updates out a specific interface This can be accomplished with the passive interface interface router configuration command For RIP to function in a non broadcast environment neighbor relationships must be configured This can be accomplished with the neighbor ip address router configuration CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 7 Copyright 2004 Cisco Systems Inc command The RIP version can also be changed with the version 1 2 router configuration command Other variations of this command may be placed on the interface to specify which version of packets to send and receive 7 2 5 Verifying RIP configuration The show ip protocol andthe show ip route commands can be used to verify the configuration of RIP The show ip protocol command displays information about all of the IP routing protocols that are used on the router This command can be used to verify that RIP is configured interfaces are correctly sending and receiving RIP updates and that the router is advertising the correct networks The basic timers filters and version can also be verified with the show ip protocol command The show ip route command can be used to verify that RIP routes are received These routes will be identified by an R which indicates that they were learned through RIP 7 2 6 Troubleshooting RIP update issues
151. er method The second method is to only permit traffic that is specified as appropriate With this type of list every type of traffic that is permissible requires a line in the list to permit it All other traffic will be denied by the implicit deny at the bottom of the list These lists consist of primarily permit statements and do not have a permit any at the end of the list While these lists require more planning and lines of code they are typically more secure The maintenance for this type of list is usually triggered by the implementation of a new application or service that requires access by hosts on the internetwork 11 2 3 Named ACLs IP named ACLs were introduced in Cisco IOS Software Release 11 2 to allow standard and extended ACLs to be given names instead of numbers The advantages of a named access list are as follows e Intuitively identify an ACL with an alphanumeric name e Eliminates the limit of 99 simple and 100 extended ACLs e Ability to modify ACLs without deleting and then reconfiguring them It is important to note that a named access list will allow the deletion of statements but will only allow for statements to be inserted at the end of a list The configuration of a named ACL is very similar to the configuration of a standard or extended ACL The first difference is that instead of starting the command with access list the named ACL uses ip access list rtl config ip access list extended Extended Access List
152. erfac switching is enabled s disabled ccounting is disabled n accounting is disabled ression is disabled Gateway Discovery Policy routing is SerialO is up Internet address i Broadcast address plies are disabled is disabled disabled line protocol is up s 172 16 64 2 19 TS 2994299 2008209 Address determined by setup command MTU is 1500 bytes Helper address is Directed broadcast Outgoing access li Inbound access lis Proxy ARP is enabl Security level is Split horizon is e ICMP redirects are ICMP unreachables ICMP mask replies not set forwarding is enabled st is not set t is not set ed default nabled always sent are always sent are never sent IP fast switching IP fast switching IP multicast fast Router Discovery i IP output packet a IP access violatio TCP IP header comp is enabled on the same interface is is disabled nabled switching is enabled s disabled ccounting is disabled n accounting is disabled ression is disabled Probe proxy name r Gateway Discovery plies are disabled is disabled disabled Policy routing is Seriall is administ ratively down Internet protocol Boaz show ip access Extended IP access permit ip 172 16 96 0 0 0 31 255 host 172 16 32 5 permit ip 172 16 96 0 0 0 31 255 172 16 96 0 0 0 31 255 144 238 CCNA 2 Routers and Routing Basics v3 processing disabled li
153. erialO is administratively down line protocol is down Internet protocol processing disabled Seriall is up line protocol is up Internet address is 172 16 128 2 19 Broadcast address is 255 255 255 255 Address determined by setup command MTU is 1500 bytes Helper address is not set Directed broadcast forwarding is enabled Outgoing access list is not set Inbound access list is not set Proxy ARP is enabled Security level is default Split horizon is enabled ICMP redirects are always sent ICMP unreachables are always sent ICMP mask replies are never sent IP fast switching is enabled nabled IP fast switching on the same interface is IP multicast fast switching is enabled Router Discovery is disabled IP output packet accounting is disabled IP access violation accounting is disabled TCP IP header compression is disabled Probe proxy name replies are disabled Gateway Discovery is disabled Policy routing is disabled Eva show ip access lists Extended IP access list 103 permit ip 172 16 160 0 0 0 31 255 host 172 16 32 5 15 matches 154 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Case Study Copyright 2004 Cisco Systems Inc permit ip 172 16 160 0 0 0 31 255 172 16 160 0 0 0 31 255 225 matches deny tcp 172 16 160 0 0 0 31 255 any eq telnet deny icmp 172 16 160 0 0 0 31 255 any 20 matches Eva 155 238 CCNA 2 Routers and Routing Basics v3
154. ermine the gateway of last resort Determine the route source and destination address Determine the route administrative distance Determine the route metric Determine the route next hop Determine the last route update Observe multiple paths to a destination Use a structured approach to troubleshooting Test by OSI layers Use indicators to troubleshoot Layer 1 Use the ping command to troubleshoot Layer 3 Use the telnet command to troubleshoot Layer 7 Use the show interfaces command to troubleshoot Layer 1 and Layer 2 Use the show ip route and show ip protocols commands to troubleshoot routing issues Use the following commands to troubleshoot various router problems show cdp traceroute show controllers serial debug 110 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 9 Copyright 2004 Cisco Systems Inc Module 10 Intermediate TCP IP Overview Module 10 is a good place to have the student compare IP and TCP It is essential for the students to understand that IP is connectionless and unreliable while TCP is connection oriented and reliable In this section the students will gain an understanding of the transport layer ports that allows for the full communications process between two hosts The following objectives will be covered e Multiple conversations between hosts e Ports used for services and clients e Port numbering and well known ports e Comparison of MAC addresses IP addre
155. ersus time graphs of signals as the time domain These graphs show the output from an oscilloscope which is a device that measures voltage These graphs summarize many important networking concepts particularly in the first semester curriculum e Bits e Bytes e Analog signals e Digital signals e Noise attenuation e Reflection 221 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Appendix B Copyright 2004 Cisco Systems Inc e Collision e AC e DC e RFI e EMI e Encoding e Transmission errors Web Links David Ausubel Advance Organizers http chd gse qmu edu immersion knowledgebase strategies cognitivism AdvancedOrganizers htm 222 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Appendix B Copyright 2004 Cisco Systems Inc B 4 8 Setting goals Students perform well when they have a plan and access to the necessary resources The research on goal setting and its impact on learning is impressive There are certain truths for students who set personal achievement goals When students set personal achievement goals they can identify and connect to a greater purpose to reach their goals Students identify how a goal fits into their future plans through reflection problem solving and decision making Students define the steps they need to take to reach long term and short term goals They set criteria for each level of achievement and conjure up a mental picture of the resul
156. es include standard desktop tools text editor printing and mail The course is designed for 70 hours About half of this time is spent on the instructor facilitated online multimedia material and the rest is spent on lab exercises Fundamentals of Java Programming Fundamentals of Java Programming which is sponsored by Sun Microsystems provides a conceptual comprehension of Object Oriented programming The course also teaches students how to use the JAVA language object oriented technologies to solve business problems Topics include the language fundamentals and the Java language application programming interface API Students will learn how to use this language to create classes objects and applications This course also addresses the demand for training and preparation to be a Sun Certified Programmer for JavaTM 2 Platform This is designed as a 70 hour course However it addresses some very advanced topics that might benefit from a longer delivery model or some pre selection and screening of students Fundamentals of Web Design Fundamentals of Web Design which is sponsored by Adobe Systems will focus on the overall production processes related to website design The emphasis of the course will be on design elements that involve layout navigation and interactivity Cisco Networking Academy students will learn Web design in preparation for higher education or jobs in the Internet economy Hands on Web design exercises will use Adobe Ph
157. es not reach all routers in a network quickly enough then incorrect routing information may be sent out by routers that have not received the updates which will replace the correct information in other routers In the example Router C sends out an update to neighbor routers that incorrectly indicates that a route to Network 1 exists This is a timing issue Router C sends out updates before its neighbors have a chance to send out their newly updated information Therefore the accurate information is replaced by inaccurate information which creates a routing loop A kinesthetic activity may be helpful to students to get a mental picture of how this process occurs Instruct students to write their updates on paper and reenact the scenario from the figure and description 77 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 7 Copyright 2004 Cisco Systems Inc 7 1 3 Defining a maximum count The previous section described a situation in which slow convergence created the impression that a fictitious path to a network existed which leads to a routing loop Routing loops have a packet that circles a network uses up bandwidth and never reaches its destination Distance vector algorithms are designed to prevent these loops by defining a maximum hop count This value is known as a routing metric A metric is the criteria used by a router to determine the best path to a destination network Metrics vary for different prot
158. f essential software e The operating system e The config file The operating system that is used in almost all Cisco devices is the Cisco IOS The IOS is the software that allows the hardware to function as a router or a switch The software a router or switch uses is referred to as the configuration or config file The configuration file contains the instructions that define how the device will route or switch The IOS is stored in Flash memory The configuration file is stored in NVRAM Discuss with the students the differences between these types of memory and help the student understand by opening a router and showing the inside of the router to the students Discuss RAM ROM flash and NVRAM Students must understand the differences between them One difference to discuss is that the IOS in flash or RAM is several megabytes and the configuration file in NVRAM is up to a few kilobytes Version 12 and newer releases of the IOS provide a single interface to all file systems This is referred to as the Cisco IOS File System IFS The IFS can be used to perform all the file system management for a router Explain that the IFS is based on UNIX file systems 5 2 2 IOS naming convention 55 238 Many different versions of the IOS are available The IOS supports many different hardware platforms and features This is a continuous development process To identify the different versions Cisco has a naming convention for the IOS files The IO
159. f routing packets over multiple equal cost paths to increase throughput RIP can load balance over as many as six equal cost paths although four is the default Packets are sent round robin over the equal cost paths this means that the equal cost paths are used in turn Since the metric for RIP is hop count equal cost paths indicate that a network can be reached through multiple paths that have the same hop count CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 7 Copyright 2004 Cisco Systems Inc This does not consider the bandwidth of each link So while load balancing may allow packets to travel multiple paths to reach a destination huge bandwidth differences among equal cost paths could actually slow throughput 7 2 9 Load balancing across multiple paths A router may have multiple paths to a given destination network If these paths have different metrics the router will use the route with the best metric to forward packets If multiple routes have the same metric associated with them the router will use load balancing to spread out the traffic that is forwarded to a particular network This helps reduce traffic on a given route to speed up communications Load balancing is enabled by default on routers that use RIP and IGRP With the exception of BGP IP routing protocols route to four parallel routes by default The administrator also has the option of load balancing on a per packet or per destination basis A
160. following categories e Content e Product e Process 227 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Appendix B Copyright 2004 Cisco Systems Inc Progress Throughout the year students should review their reflections and acknowledge the growth in their comprehension Prior to a reporting period students should write a brief paper that explains their growth in knowledge and the skills they acquired in the preceding weeks Some examples of reflection and journal writing for Academy courses are as follows Key ideas from class presentations Discussions Activities related to lesson content Personal analysis that shows a connection with the content purpose Questions or statements that indicate a need for further clarification or inquiry Attention to the process required to accomplish an important task Application of learned material to other content or subjects A demonstration of the connection between concept or content Thoughtfulness as demonstrated by goals for improvement Other actions that demonstrate self learning Acquired knowledge Important concepts Skills Improvements Effective strategies Ineffective strategies Group activities Instructor performance Progress Shortcomings Goals for further learning Applications of knowledge 228 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Appendix B Copyright 2004 Cisco Systems Inc Web Links Student Reflect
161. form the analysis Users paste the output of one or more supported commands into Output Interpreter to receive a report that includes errors warnings and relevant troubleshooting information The report also includes crash analysis and error message decodes which were previously supported by the Stack Decoder and the Error Message Decoder tools http www cisco com cgi bin Support Outputlnterpreter home pl 158 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Appendix A Copyright 2004 Cisco Systems Inc 2 Error Message Decoder Cisco SYSTEMS Technical Support M g TECHNICAL SUPPORT TOOLS amp UTILITIES Error Message Decoder This tool will help you research and resolve error messages for Cisco IOS Software Catalyst Switches Software and Cisco Secure PIX Firewall Software Follow the steps below to receive a description recommended action and related resources for your one or two line error message Standard error messages have the following structure FACILITY SEVERITY MNEMONIC Message tent Ex SYS 2 MALLOCFAIL Other console messages like debugs or router crashes are not supported by this tool Please check the help file for more information Copy the error message from your device paste it here then click Submit Paste Error Message l M suggest related documents within results Submit RESELLERS ABOUT CISCO Home Logged In Profile Contacts amp Feedback Help Site Map
162. formance labs or activities Web Links RUBISTAR http rubistar 4teachers org Rubrics and Assessments http nome socal rr com exworthy rubric htm 231 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Appendix B Copyright 2004 Cisco Systems Inc B 5 4 Portfolio A portfolio is an example of authentic assessment As students complete major presentations or networking projects they save them in a portfolio A portfolio of accomplishments must be presented before many companies will hire an individual Portfolios show growth over time and include student reflections on different periods of learning Academy students might keep a portfolio of their experience in building a network and examples of configurations they created for different scenarios Community projects are also good examples of accomplishments A portfolio is a paper electronic or online collection that shows the best work of a student As with any educational initiative portfolios are continually revised and improved Many secondary school districts encourage portfolio based assessments The Cisco Networking Academy Program is well suited for this type of assessment Students maintain their portfolios to include all of their best work throughout all semesters of a curriculum This portfolio can contribute to graduation criteria It can also serve as an impressive display for potential employers Web Links Guidelines for Portfolio Assessment in Teachi
163. formation Sources Gateway Distance Last Update 172 16 128 1 100 00 00 07 Distance default is 100 Eva tshow ip interface brief Interface IP Address OK Method Status Protocol Etherneto0 172 16 160 1 YES manual up down Serial0d unassigned YES unset administratively down down Seriall 172 16 128 2 YES manual up up Evatshow version Cisco Internetwork Operating System Software IOS tm 3000 Software IGS J L Version 11 1 5 RELEASE SOFTWARE fcl Copyright c 1986 1996 by cisco Systems Inc Compiled Mon 05 Aug 96 11 48 by mkamson 151 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Case Study Copyright 2004 Cisco Systems Inc Image text base 0x0303794C data base 0x00001000 ROM System Bootstrap Version 11 0 10c SOFTWARE n ROM 3000 Bootstrap Software IGS BOOT R V SOFTWARE fcl Eva uptime is 5 hours 4 minutes System restarted by reload rsion 11 0 10c RELEASE System image file is flash igs j 1 111 5 booted via flash Cisco 2500 68030 processor revision N with 6144K 2048K bytes of memory Processor board ID 06147980 with hardware revision 00000000 Bridging software SuperLAT software copyright 1990 by Meridian Technology Corp X 25 software Version 2 0 NET2 BFE and GOSIP compliant TN3270 Emulation software copyright 1994 by 1 Ethernet IEEE 802 3 interface 2 Serial network interfaces
164. g Milken Family Foundation http www mff org edtech North Central Regional Educational Laboratory http www ncrel org Alabama Best Practices Center http www bestpracticescenter org index asp Mid Continent Research for Education and Learning http Avww mcrel org B 1 2 NETS NETS Standards National Educational Technology Standards for Students NETS National Educational Technology Standards for Teachers NET T National Educational Technology Standards for Administrators NET A Figure 1 NETS Standards The International Society for Technology in Education ISTE is a nonprofit professional organization that prepares students teachers and administrators for a business world that demands proficiency in information technology The ISTE has written National Educational Technology Standards NETS for students teachers and administrators The NETS for Students NETSsS are divided into six categories Basic operations and concepts Social ethical and human issues Technology productivity tools Technology communication tools Technology research tools Technology problem solving and decision making tools ISTE also features NETS for Teachers NETSsT There are six categories for teacher standards that are based on current research on teaching and learning with technology The ISTE has considered the need for planning and integration as well as the emergence of new technologies in classrooms The six categorie
165. g Through this type of reflection teachers and students can track their comprehension of issues and themes over time Academy instructors may want to instruct students to keep a technical or engineering journal to record details about all aspects of their network design and installation experiences This may not seem important at first However it will help students develop a habit that will become more important as they increase their networking experiences These journals are usually paperbound composition books in which pages are dated and added but never removed The entries would include things such as daily reflections troubleshooting details procedures and observations equipment logs hardware and software notes and router configurations Student reflection is an important element of instruction with limited time requirements The process helps students analyze and become more responsible for their learning During reflection the students think about an aspect of the lesson and write a reaction in the study guide This internalization of learning helps the students set goals and make sense of the learning process It also links prior learning to present and future learning The reflection process helps students analyze and synthesize new comprehension Students use the cognitive processes of assimilation and accommodation to move learning from short term to long term memory After each lesson students should reflect on one or more of the
166. h is available and free to all CCNA and CCNP students Flash simulations are meant to complement hands on experience with lab equipment and actual programming These simulations have many cognitive benefits For example simulations allow students to perform a simulative lab activity prior to an actual lab activity This helps students increase their level of comprehension in a simulated environment before they are required to demonstrate a final proficiency with equipment and programming In the future many more simulations across the curricula will be developed for the Cisco Networking Academy Program B 2 5 Sponsored curriculum labs IT Essentials and Il Sponsored by Hewlett Packard Figure 1 Sponsored Curriculum Labs 187 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Appendix B Copyright 2004 Cisco Systems Inc PANDUIT PAN NET Cable Management a El on ea Fundamentals of Voice and Data Cabling Sponsored by Panduit Figure 2 Sponsored Curriculum Labs O O OOOO OOO Fundamentals of UNIX Sponsored by Sun Microsystems Figure 3 Sponsored Curriculum Labs 188 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Appendix B Copyright 2004 Cisco Systems Inc The six sponsored curricula also require dedicated labs and a variety of hardware and software They are summarized in the following sections IT Essentials PC Hardware and Software IT Essentials PC Hardwar
167. he following configuration modes are available in global configuration mode e Interface e Subinterface e Controller e Map list e Map class e Line e Router Global configuration commands are used in a router to apply configuration statements that affect the entire system Use the privileged EXEC command configure terminal to enter global configuration mode Explain that Cisco IOS is modal Emphasize that in the CLI that there are different modes to accomplish different tasks There are several advantages to this One is that the commands are generally shorter because the object of the mode i e the interface or routing protocol to CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 3 Copyright 2004 Cisco Systems Inc be changed does not need to be specified in the command Another advantage is that only the parameters or objects of the mode i e the interface or routing protocol can be modified by the command This helps prevent accidental configuration of the wrong object There are shortcuts to show students at a later time e config t for configure terminal e int fa0 0 for interface fastethernet 0 0 Students commonly enter the correct command at the incorrect prompt If the students are unable to enter a command check the mode The prompt will be either Router config or Router config if Ask students the following questions e Which mode is the user in when first logging into the router
168. he interface This information will be used when the ip access group command is applied Next have the students decide on which router to configure an ACL Remind them that a standard ACL is applied closest to the destination When the students have the correct router they must then decide which interface to apply the ACL to and if it should filter in or out Ask the students which interface is closest to the destination and then ask if the packet is going in or out the interface 124 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 11 Copyright 2004 Cisco Systems Inc 11 2 2 Extended ACLs Extended ACLs are used more often than standard ACLs because they provide a greater range of control Extended ACLs check the source and destination packet addresses and also check for protocols and port numbers This provides greater flexibility to define what the ACL will filter Packets can be permitted or denied access based on where the packet originated and its destination or protocol types and port addresses For a single ACL multiple statements may be configured The syntax for the extended ACL statement can get very long and will often wrap in the terminal window The wildcards also have the option of using the host or any keywords in the command The extended ACL uses the source and destination address Ask students what ports are used for FTP Telnet SMTP HTTP and DNS The students need to have these ports memorized
169. he metric is a value that measures the desirability of a route Some routing protocols use only one factor to calculate a metric For example RIP only uses hop count as a metric Other protocols base their metric on bandwidth delay load reliability ticks maximum transmission unit and cost Discuss with the students the differences between each of these metrics so they fully understand what is used to calculate the best route Each routing algorithm interprets what is best in its own way The algorithm generates a number called the metric value for each path through the network The smaller the metric value is the better the path Review the administrative distances covered in an earlier section Make sure students understand the difference between administrative distances and metrics Also explain that routes from different protocols cannot be compared since routing protocols use different metrics and different methods to determine the metric value 9 1 7 Determining the route next hop Routing algorithms fill routing tables with information Destination or next hop associations tell a router that a particular destination can be reached if the packet is sent to a particular router that represents the next hop on the way to the final destination Have students look at routing table examples and determine the next hop router for a network 9 1 8 Determining the last routing update A network administrator can use the following commands to fin
170. he opprtunity to make Cisco equipment accessible to students from anywhere on the Internet If you are an instructor interested in NETLAB for your Academy please send an e mail to info netdevgroup com Figure 1 NETLAB Many educators are interested in remote access to shared lab equipment to give students more access to hands on experiences Remote access technologies can be used in courses such as the CCNA CCNP and sponsored curriculum to help lower student to equipment ratios in distance learning situations These technologies are currently fully implemented only for the CCNA courses This course will examine this issue in more depth and suggest how instructors and Academies can use these technologies or implement their own versions of them Cisco Networking Academy now offers the NDG NETLAB solution This web based appliance allows Cisco Networking Academies to host live router topologies and curriculum over the Internet The NETLAB automation and sharing capabilities allow Cisco Networking Academies to maximize the use of their equipment and save money in the process The networking hardware is identical to the lab bundle used in Cisco Networking Academies worldwide This will allow students to maintain a consistent topology to practice the configuration commands covered in the Academy curriculum and labs The use of NETLAB in the Cisco Networking Academy will allow students to log in create and edit configuration files Students can als
171. he three basic types of connections on a router are LAN interfaces WAN interfaces and management ports LAN interfaces allow the router segment network boundaries within a LAN and reduce broadcast traffic within a LAN WAN connections are provided through a service provider which connects two or more distant site through the Internet or PSTN The LAN and WAN connections provide network connections through which frames are passed The management port provides an ASCII or text based connection for the configuration and troubleshooting of the router Ask students the following questions e What are the three basic types of connections on a router e What is the console connection used for 1 2 4 Management port connections The management ports are asynchronous serial ports They are the console port and the auxiliary port Not all routers have an auxiliary port These serial ports are not designed as networking ports To prepare for initial startup and configuration attach an RS 232 ASCII terminal or a computer that emulates an ACSII terminal to the system console port It is essential for students to understand the difference between network interfaces and non network interfaces The instructor may need to talk about the differences extensively Discuss the following topics e The network ports use network encapsulation frames while the non network ports are bit and byte oriented e There is no addressing involved in the serial management po
172. hen reflect on the process to better understand the mathematical concepts This study encourages educators to examine teaching practices and content to determine the methods that will lead to higher student achievement The most recent implementation of this study is TIMSS 1999 which included 38 countries The 1999 assessment measured the mathematics and science abilities of eighth grade students Extensive data was collected from students teachers and school principals about the mathematics and science curricula They also investigated instructional practices home contexts school characteristics and policies The next TIMSS assessment will occur in 2003 171 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Appendix B Copyright 2004 Cisco Systems Inc Web Links Third International Math and Science Study http isc bc edu timss1999benchmark html TIMSS International Study Center http timss bc edu B 1 5 Student centered learning Online Curriculum _S Resources Hands On Labs Online Assessment contructs their understanding via a variety of experiences Simulations Case Studies and Remote x Labs Field Work Skilled Instructor Figure 1 Learner Model Academy Student Figure 1 illustrates the Cisco Networking Academy learner model The model is designed to maximize student performance Instructors are encouraged to strengthen and enhance the online curriculum and labs When all componen
173. hoot and configure routing protocols based on user requirements Hands on skills none CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 7 Copyright 2004 Cisco Systems Inc 7 3 1 IGRP features IGRP is a Cisco proprietary distance vector interior gateway routing protocol Distance vector routing protocols mathematically compare routes to determine the best path IGRP was designed to take advantage of the simplicity of RIP and adds other metrics for best path selection and better scalability The metrics available with IGRP are bandwidth delay load reliability and maximum transmission unit MTU These metrics can be used to make better mathematical decisions about best paths than the hop count metric used by RIP By default bandwidth and delay are the two metrics that are used and the others are set to zero IGRP shares its routing information through the use of timed updates every 90 seconds Draw an example on the board to demonstrate how IGRP can make better routing decisions than RIP There are three important points to emphasize e IGRP is Cisco proprietary If students can select which routing protocols to use the internetwork will have to be all Cisco devices for IGRP to be chosen e The default update time of IGRP is 90 seconds and the updates are broadcast e The default algorithms of IGRP are bandwidth and delay The others can be used if the algorithm is changed MTU is only exchanged in the update It is
174. how startup config e show ip access list 138 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Case Study Copyright 2004 Cisco Systems Inc Case Study Instructor Notes Phase 1 Project Description This phase of the case study can begin early in the semester as students should be familiar with subnetting The entire case study should be discussed in class so that all students understand that the purpose of this study is not only to practice configuration and troubleshooting but also to learn how to document their work The following are some good web sites that will help the students understanding of documentation http www ittoolkit com articles tech importofdocs htm http www serverwatch com tutorials article ohp 1475021 http Awww ethermanage com ethernet 100quickref chi4qr_16 html http tampabay bizjournals com tampabay stories 1997 11 24 smallb2 html The network address assigned should be one of the private IP address ranges or a subnet of one Class Range A 10 0 0 0 10 255 255 255 B 172 16 0 0 172 31 255 255 C 192 168 0 0 192 168 255 255 The routing protocol should be IGRP The first part of Phase 1 should probably be completed as a class so that students understand the purpose of the case study Along with a discussion of Phase 1 the deliverable piece should also be covered The instructor should decide whether or not this is a group project Certainly
175. hubs switches and routers CCNA 3 students acquire lab skills that enable them to perform the following tasks e Switch configuration e VLAN configuration e Intermediate routing protocol implementation e Use of access control lists to provide traffic control and security on a simple network 180 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Appendix B Copyright 2004 Cisco Systems Inc The required lab equipment for CCNA 4 includes workstations hubs switches and routers Optional WAN simulation equipment is also recommended Students acquire lab skills in the following WAN technology areas e PPP e ISDN e Frame Relay Students also must pass a comprehensive lab skills exam as part of this course Standard and premium lab bundles are available A variety of optional bundles are also available The student to equipment ratio should be as low as possible Web Links Cisco Networking Academy Program http cisco netacad net 181 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Appendix B Copyright 2004 Cisco Systems Inc B 2 2 CCNP labs Lo2 Lo1 12 0 0 1 24 11 0 0 1 24 Lo3 0 1 13 0 0 1 24 10 1 1 1 30 S 0 1 10 1 1 2 30 pce DTE CATES S 0 0 1 172 16 2 1 24 DLCI 18 Adtran 1 1 Frame Relay OSPF Area 0 Adtran 1 2 DLCI 16 RIP S 0 0 1 172 16 2 3 24 Lo 1 172 16 200 1 24 Lo 2 172 16 210 1 24 172 16 10 1 24
176. ich CatOS release will support all the installed hardware Note The Catalyst 4000 5000 and 6000 Series have both Cisco IOS and CatOS supported hardware Close Window TT 1992 2003 Cisco Systems Inc All rights reserved Important Notices Privacy Statement and Trademarks of Cisco Systems Inc The Software Advisor helps users choose the appropriate software for network devices Users can match software features to Cisco IOS and CatOS releases compare IOS releases or find out which software releases support their hardware http Awww cisco com cqgi bin Support CompNav Index p 164 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Appendix A Copyright 2004 Cisco Systems Inc 8 Feature Navigator Il Cisco SYSTEMS Profile Contacts amp Feedback Help Site Map Select a Location Language Products amp Services M co Search O GENERAL INFORMATION Search All Cisco com v Cisco Feature Navigator Il What Took Hours Now Takes Minutes Cisco Feature Navigator is a web based application that allows you to quickly find the right Cisco 10S Software release for the features you want to run on your Network Solution Finder for Modular Routers Dynamic Configuration Tool Bug Toolkit Feature Quickly find which Cisco IOS release supports your features IP BGP etc MIB Locator Search by feature of Navigate Cisco IOS software release by searching on Release Quickly find the feat
177. iculum shows the command entered as clock rate but on some Cisco routers the command can be entered as clockrate Both will result in the same running configuration The second item is that interfaces are shutdown by default and must be enabled with the no shutdown command The shutdown command will turn off an interface Instruct students to check for interfaces that are shutdown when troubleshooting the student labs This can be checked by typing show interface serial 0 00rshow run int serial 0 0 for the interface serial 0 0 Ask students the following questions e What command turns on an interface e What command turns off an interface e What command is entered on an interface at the DCE end of the cable 3 1 6 Making configuration changes To verify changes use the show running config command This command will display the current configuration If the intended variables are not displayed the environment can be corrected in the following ways e Issue the no form of a configuration command e Restart the system and reload the original configuration file from NVRAM 31 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 3 Copyright 2004 Cisco Systems Inc e Remove the startup configuration file with the erase startup config command e Restart the router and enter setup mode To save the configuration variables to the startup configuration file in NVRAM enter the following command at the privileged EX
178. ies Routers Learning amp Events Get dates locations and registration details for training seminars events and certifications Learn more about the Cisco Networking Academy Program and other educational certification programs 22 OCT 2002 Cisco Systems to Acquire Figure 1 Cisco com The Internet has a tremendous amount of resources for people who want to understand or install networks Students can also research products answer questions or perform extension activities Academy students are encouraged to use the links built into the Instructors Guide or their favorite websites The online documentation for Cisco Systems Sun Microsystems HP Panduit and other sponsors is particularly important In terms of bandwidth capabilities the Web resources related to networking far exceed any textbook or online curriculum Students must find the resources and be cautious consumers The ability to use the Internet as a resource is a very useful skill for students to develop Web Links Cisco http www cisco com Sun http www sun com index xml Adobe http www adobe com Panduit http www panduit com Hewlett Packard http Awww hp com Google http Awww google com Yahoo http www yahoo com 204 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Appendix B Copyright 2004 Cisco Systems Inc B 4 Instructional Strategies B 4 1 Instructor led classrooms Figure 1 Instructor Led Classrooms The
179. ign model consists of the following e The core layer forwards packets as quickly as possible e The distribution layer provides a boundary by using filters to limit what gets to the core e The access layer feeds traffic into the network and controls entry into the network CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 1 Copyright 2004 Cisco Systems Inc 1 1 4 Role of Routers ina WAN There are several encapsulations associated with serial lines e HDLC e Frame Relay e PPP e SDLC e SLIP e LAPB Some of the most common WAN technologies are as follows e POTS e ISDN e X 25 e Frame Relay e AIM e 11 73 E1 and E3 e DSL e SONET Ask students to briefly explain each of the WAN technologies and discuss the differences between technologies and encapsulations They will be covered in detail in CCNA 4 It is important to encourage student interest and enthusiasm in this TI The world of WAN technologies is briefly introduced Many students will be familiar with one or more of the technologies used Many of these topics will be covered in CCNA 4 and students should be encouraged to do additional research on one of these technologies and present it to the class 1 1 5 Academy approach to hands on labs In the Networking Academy lab all the networks are connected with a serial or Ethernet cable This allows the students to see and touch all of the equipment In a real network the routers would not
180. igned for use between two different autonomous systems An example of an EGP protocol is Border Gateway Protocol BGP BGP is the routing protocol used on the Internet Interior routing protocols are designed to be used within an autonomous system BGP is the routing protocol used on the Internet Interior routing protocols are designed to be used within an AS 73 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 6 Copyright 2004 Cisco Systems Inc Module 6 Summary Before students begin Module 7 they must be able to configure static routes and use the show ip route ping and traceroute commands to perform basic network testing Online assessment options include the end of module online quiz in the curriculum and the online Module 6 exam Formative evaluations of students as they work on the routers may be valuable in this module Students should understand the following main points A router will not forward a packet without a route to a destination network Network administrators must manually configure static routes Default routes are special static routes that provide routers with gateways of last resort Static and default routes are configured with the ip route command Static and default route configuration can be verified with the show ip route ping and traceroute commands How to verify and troubleshoot static and default routes Routing protocols Autonomous systems Purpose of routing proto
181. ime for students to understand Work through numerous examples Have students finish the hands on labs and e Labs Consider spending less time on Modules 1 5 8 and 10 to make sure ACLs are properly learned Students who complete this module should be able to perform the following tasks e Describe the differences between standard and extended ACLs e Explain the rules for placement of ACLs e Create and apply named ACLs e Describe the function of firewalls e Use ACLs to restrict virtual terminal access 11 1 Access Control List Fundamentals Essential Labs None Optional Labs None Core Tis All Optional Tis none Course Level Claim Students can identify the application of packet control with various access control lists Certification Level Claim Students can implement access lists develop an access list to meet user specifications and evaluate rules for packet control Hands on skills none 119 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 11 Copyright 2004 Cisco Systems Inc 11 1 1 Introduction to ACLs ACLs are lists of conditions that are applied to traffic that travels across a router interface These lists tell the router what types of packets to accept or deny ACLs can be created for all routed network protocols ACLs filter network traffic and determine if routed packets are forwarded or blocked at the router interfaces The ACL parameters that can be defined include source and destina
182. ion Questions http oblmm k12 ca us PBLGuide PlanAssess StReflectionQuestions html 229 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Appendix B Copyright 2004 Cisco Systems Inc B 5 3 Rubrics Grading Rubric Final Project Group Members Site Name Site URL The final project combines several key concepts from the curriculum and the lab exercises completed in GoLive Photoshop LiveMotion and Illustrator The student site must accommodate the following A minimum of 10 pages including a home page w mission statement Figure 1 Grading Rubric Sample Another good instructional practice is the use of rubrics as a form of assessment A rubric allows criteria to be established for outcomes that are acquired through individual or group projects Levels of success and quality are identified at different levels of a predetermined scale Quantitative data can be associated with each level of performance Rubrics assess observable learning behavior all curriculum content associated with a project and other components such as design research skills organization of thought cooperative skills and the ability to communicate emerging knowledge The rubric has two primary functions for teaching and learning Rubrics communicate expectations and give students a level of achievement to work toward One of the most important benefits of rubric assessment is the control it gives to students Students can
183. is 0 percent 0 5 Demonstrate a successful trace LAB A trace lab e Typ scape sequence to abort Tracing the route to LAB E 210 93 105 2 B B 201 100 11 2 32 msec 24 msec 24 msec B C 199 6 13 2 32 msec 52 msec 40 msec B D 204 204 7 2 64 msec 64 msec 64 msec B E 210 93 105 2 60 msec 64 msec DD DD BwWN FP Demonstrate an unsuccessful trace LAB A trace lab d Typ scape sequence to abort Tracing the route to LAB D 204 204 7 2 1 LAB B 201 100 11 2 36 msec 28 msec 24 msec 2 LAB C 199 6 13 2 36 msec 44 msec 40 msec 3 LAB C 199 6 13 2 H H 48 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 4 Copyright 2004 Cisco Systems Inc Show a routing table LAB C show ip route Codes C connected S static IGRP R RIP M mobile B BGP D EIGRP EX EIGRP external O OSPF IA OSPF inter area El OSPF external type 1 E2 OSPF external type 2 EGP i IS IS L IS IS level 1 L2 IS IS level 2 candidate default U per user static route Gateway of last resort is not set C 204 204 7 0 24 is directly connected Serial0 C 223 8 151 0 24 is directly connected Ethernet0 R 201 100 11 0 24 1
184. is an error reporting protocol for IP When datagram delivery errors occur ICMP is used to report these errors back to the sender of the datagram This is an excellent opportunity to show the students this procedure in the lab setup They should be shown that ICMP does not correct the encountered network problem ICMP just reports on the status of the delivered packet to the sender Its function is not to propagate information about network changes 8 1 3 ICMP message delivery 94 238 ICMP is a message protocol for TCP IP protocol suite ICMP messages are encapsulated as data in ICMP packets in the same way that IP data is delivered ICMP messages have their own header information They are subject to the same failures as any other data The students should realize that ICMP is a Layer 3 protocol that does not use IP packets ICMP uses IP addressing but has a different structure than an IP packet Show the students that this scenario could generate more error reports and cause increased congestion on an already ailing network For this reason errors created by ICMP messages do not generate their own ICMP messages Stress to the students that it is possible to have a datagram delivery error that is never reported back to the sender of the data CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 8 Copyright 2004 Cisco Systems Inc 8 1 4 Unreachable networks Network communications depend on certain basic conditions e Th
185. is chosen However design is a repetitious process and many layers of matrices are typically created with increasingly refined specifications weighted rubrics and significant brainstorming and research Flowcharts are a standard part of computer programming Flowcharts and process flow diagrams are generally used to graphically represent various branches of a process Flowcharts are used throughout the curriculum to describe configuration troubleshooting and communications processes Block diagrams are standard in the electronics industry A few simple symbols or pictorials and arrows are used to indicate the flow of information Block diagrams include simple descriptions of the functions of the various blocks Block diagrams represent an intermediate level of detail for electrical systems They are not circuit level schematic diagrams A block diagram of the following components is a good accompaniment to flowcharts that explain the processes that occur among the blocks e The internal components of a PC e The internal components of a router e The devices make up the LAN or a WAN In networking there are logical topological diagrams and physical topological diagrams Logical topologies refer to logical interconnections and the flow of information in a network Physical topologies refer to the devices ports interconnections and physical layout of a network Both of these diagrams are used extensively Electrical engineers refer to voltage v
186. isco IOS ROM monitor is used to recover from system failures and recover a lost password Boot ROM is used to modify the Cisco IOS image in flash There is a limited subset of features in this mode Normal operation of a router requires the full Cisco IOS image Discuss the three operating environments Students should be able to identify these environments Students must be familiar with the IOS to control the router Cisco technology is in the IOS not in the hardware 2 1 5 Operation of Cisco IOS software There are numerous IOS images for different Cisco device models Each devise uses a similar basic command structure for configuration The configuration and troubleshooting skills acquired on a specific device will apply to a variety of products The naming convention for the different Cisco IOS Releases contains three parts e The platform on which the image runs e The special capabilities and feature sets supported in the image e Where the image runs and whether it has been zipped or compressed One of the major constraints for the use of a new IOS image is compatibility with the router flash and RAM memory The students should also understand that the same IOS is used on the smallest to the largest Cisco products This will assure students that the skills they develop on small Cisco routers can be applied to larger routers and switches Show students various naming conventions and identify the three parts of the naming convention Fo
187. ith practice students will be able to diagnose and fix the problems in a finite amount of time This method must be integrated with labs that do the following e Expose students to a working system e Demonstrate the typical failure modes of that system e Allow students to experience first hand the symptoms of those failure modes 194 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Appendix B Copyright 2004 Cisco Systems Inc e Provide opportunities for students to practice diagnosis and repair Web Links Teaching Methods Web Resources http Awww mhhe com socscience education methods resources html The Universal Troubleshooting Process UTP http Awww troubleshooters com tuni htm Journal of Technology Education http scholar lib vt edu ejournals JTE v2n2 html deluca htm 195 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Appendix B Copyright 2004 Cisco Systems Inc B 3 Project based Instruction B 3 1 Challenges and projects NetDay Hero Awards Each year NetDay recognizes outstanding individuals who through their heroic and selfless leadership have made significant contributions to education and education technology This award the NetDay Hero Award honors individuals who have made a life long commitment to improving and enhancing educational opportunities for children through the use of technology 2002 Hero Award Recipients Elaine and John Chambers We are proud to
188. ities e Groups of five students to take oral exams and work as network or programming teams There are a variety of ways to engage students through cooperative learning Instructors can divide the class into student groups to conduct reviews ask questions learn content and work on performance labs or other activities It is important to know how and when to use groups for the most effective instruction The following examples illustrate some of the types of groups and the purposes for which they might be used Pairs or partners There are different methods that instructors can use to partner students e Each student can choose another student with whom they want to work e The instructor can assign partners e Students can work with other students based on the classroom seating arrangement Students can work in teams of two or they can form a larger group Students can also partner with three students in classes with an odd number of students A pair may partner with another pair so that the absence of one student will not disrupt their work Small groups Small groups usually have three to five students Small groups can be formed in the following ways e The students can choose their own partners e The instructors can assign members to a group e The students can work with other students based on the classroom seating arrangement 208 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Appendix B Copyright 2004
189. izon is enabled ICMP redirects are always sent ICMP unreachables are always sent ICMP mask replies are never sent IP fast switching is enabled IP fast switching on the same interface is disabled IP multicast fast switching is enabled Router Discovery is disabled IP output packet accounting is disabled IP access violation accounting is disabled TCP IP header compression is disabled Probe proxy name replies are disabled Gateway Discovery is disabled Policy routing is disabled Ethernetl is administratively down line protocol is down Internet protocol processing disabled Serial0 is up line protocol is up Internet address is 172 16 64 1 19 Broadcast address is 255 255 255 255 Address determined by setup command MTU is 1500 bytes Helper address is not set Directed broadcast forwarding is enabled Outgoing access list is not set Inbound access list is not set Proxy ARP is enabled Security level is default Split horizon is enabled ICMP redirects are always sent ICMP unreachables are always sent ICMP mask replies are never sent IP fast switching is enabled IP fast switching on the same interface is enabled IP multicast fast switching is enabled Router Discovery is disabled IP output packet accounting is disabled IP access violation accounting is disabled TCP IP header compression is disabled Probe proxy name replies are disabled Gateway Discovery is disabled Policy routing is disabled Seriall is up line protocol
190. ject the range of control must remain flexible There will be times when the instructor takes control of the learning environment times when the students exercise more independence and times when the instructor and students share control of the direction for learning The instructor is always a role model for lifelong learning Teachers show students that even instructors address problems on a daily basis in and out of school They also model the fact that sometimes problems are solved successfully and other times they are not Students begin to realize that they will often require a team approach to find the solution to essential questions In inquiry based learning this team consists of the students and the instructor 175 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Appendix B Copyright 2004 Cisco Systems Inc Web Links Big Rocks and Powerful Kingdoms Personal Learning in Science and Social Studies http www ascd org readingroom classlead 9911 2nov99 html Using the Internet to Promote Inquiry based Learning http Awww biopoint com msla links html Project Based Learning What is it http www 4teachers org projectbased B 1 8 Special needs Special Needs Visually impaired Hearing impaired e Physically impaired Figure 1 Special Needs When there are visually impaired students in a classroom here are some general considerations to keep in mind Ask visually impaired students if they nee
191. kets with a greater port number log Log matches against this entry log input Log matches against this entry including input interface Ate Match only packets with a lower port number neq Match only packets not on a given port number 125 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 11 Copyright 2004 Cisco Systems Inc precedence Match packets with given precedence value psh Match on the PSH bit range Match only packets in the range of port numbers rst Match on the RST bit syn Match on the SYN bit time rang Specify a time range tos Match packets with given TOS value urg Match on the URG bit lt cr gt Next enter eq gt or any of the above The eq gt and 1t define ranges of port numbers The students need to know the standard port numbers and if they use TCP or UDP At the end of every ACL is the implied deny all statement A common error is failure to enter a permit statement If the ACL does not contain a permit statement nothing will be permitted There are two ways to design security with ACLs The first is to create an ACL that specifically denies potentially harmful traffic and permits all other traffic Most of the ACL statements will consist of deny statements with a permit any command as the last entry in the list This generally has the advantage of being easier to create and has fewer lines It is also less secure than the oth
192. king at a time during group work Initiate conversations with students by specifically calling their names Be patient when students are tired or frustrated with the impact of their disabilities in the lab learning environment Speak face to face It is important to be on equal eye level with a student when having a conversation Reword sentences or phrases if necessary to convey messages to students who are speech readers Be conscious of speaking distinctly and not too fast When there are physically impaired students in a classroom here are some general considerations to keep in mind Be prepared to give physically impaired students more time if necessary to complete hands on labs tasks and exams Consider giving these students shorter work assignments with rest periods built into the schedule Establish open communication with the student parent and doctor to find the right balance of work that matches individual endurance and capability Configure the lab space to accommodate wheel chairs and other transportation aids Provide preferential seating in the lab to accommodate transportation devices Offer a copy of instructor notes to the student for review on tests Use a computer for testing Provide special devices for students with physical disabilities such as word processors ergonomically designed furniture laptop computers Kurzweil print readers portable tape recorders for books on tape and voice synthesis p
193. l introduction to the field of networking This includes high school community college and lifelong learning students who are interested in careers as network technicians network engineers network administrators and network help desk staff Prerequisites The successful completion of this course requires the following e Reading age level of 13 or higher e Successful completion of CCNA 1 The following prerequisites are beneficial but not required e Prior experience with computer hardware and command line interfaces e Background in computer programming Course Description CCNA 2 Routers and Routing Basics is the second of four CCNA courses that lead to the Cisco Certified Network Associate CCNA designation CCNA 2 focuses on initial router configuration Cisco IOS Software management routing protocol configuration TCP IP and access control lists ACLs Students will learn how to configure a router manage Cisco IOS software configure routing protocols on routers and set access lists to control access to routers Course Objectives The CCNA certification indicates knowledge of networking for the small office home office SOHO market and the ability to work in small businesses or organizations that use networks with fewer than 100 nodes A CCNA certified individual can perform the following tasks e Install and configure Cisco switches and routers in multiprotocol internetworks that use LAN and WAN interfaces e Provide Level
194. l provide the path to their success In any online or self paced program there is a strong need for a course facilitator This person helps get students excited and keeps them excited about what they are learning This person also monitors student progress The online lessons are an important part of Academy instruction However they should not be overly used Remember that a primary goal of the Cisco Networking Academy Program is to train students to design install and maintain networks This is fundamentally a hands on lab based endeavor When the online curriculum is used in a classroom students should view the content individually or in pairs of two while the instructor circulates throughout the room to check for problems and comprehension Instructors may periodically interrupt students to provide additional information or clarify content Study Guides provide an organized method for students to record the important concepts of each lesson These can be used for review and reflection Self paced instruction includes the following components e Learn Knowledge is gained through vocabulary content and activities e Vocabulary Students use the glossary to list and define new terms e Notes or Ideas Important information from the lesson is recorded e Activity Students complete the activity assigned in class e Apply Students organize plan record process draft record findings and show the results of the performance
195. lab or activity e Reflect Students think about and respond to questions about the learning Their responses focus on the content product process and progress 207 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Appendix B Copyright 2004 Cisco Systems Inc B 4 3 Cooperative collaborative work Cooperative work occurs when students work in groups for extended periods of time Students work together for the benefit of all group members Research shows that cooperative learning environments stimulate cognitive activities in the areas of higher order thinking problem solving and collaboration Students who work in cooperative group situations reach objectives and goals with better accuracy than if they work individually on a task Cooperative work is a foundation strategy used when instructors ask students to analyze and synthesize complex information This strategy supports advanced thought processes such as the creation of graphic organizers and the use of logical induction to solve problems Students learn to be team players and acquire skills that will help them in their professions Cooperative work occurs when students work in groups for extended periods of time to enhance the learning experience and create an energetic classroom atmosphere Students might be grouped together as follows e Groups of two students to study online curriculum e Groups of three students to complete cabling lab and programming activ
196. lgorithm that is used Each of the three types has advantages and disadvantages 6 2 5 Distance vector routing protocol features 70 238 Distance vector routing algorithms are used to send periodic copies of a routing table Each router receives a routing table from its directly connected neighboring routers RIP sends its entire table every 30 seconds and IGRP sends its entire table every 90 seconds The algorithm eventually accumulates network distances so that it can maintain a database of CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 6 Copyright 2004 Cisco Systems Inc network topology information This is measured in hop counts or the number of routers in the path to a destination network Distance vector algorithms do not allow a router to know the exact topology of an internetwork The router only uses hop count to determine the best path Distance vector algorithms require each router to send its entire routing table to each of its neighbors This creates network traffic and there is a limit to the number of hops a distance vector routing protocol will use The RIP maximum hop count is 15 and IGRP is 255 Explain that distance vector routing protocols use the view of neighboring routers to develop their view of the internetwork The router will use copies of neighboring routing tables to build its routing table 6 2 6 Link state routing protocol features The second basic algorithm used for routing is the
197. liant TN3270 Emulation software copyright 1994 by TGV Inc 1 Ethernet IEEE 802 3 interface 2 Serial network interfaces 32K bytes of non volatile configuration memory 8192K bytes of processor board System flash Read ONLY Configuration register is 0x2102 Boaz show hosts Default domain is not set Name address lookup uses domain service Name servers are 255 255 255 255 Host Flags Age Type Address es Centre perm OK 4 IP 172 16 64 1 172 16 128 1 172 16 32 1 Boaz perm OK 4 IP 172 16 64 2 172 16 96 1 Eva perm OK 4 IP 172 16 128 2 172 16 160 1 142 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Case Study Copyright 2004 Cisco Systems Inc Boaz show startup config Using 1090 out of 32762 bytes l version 11 1 service slave log service udp small servers service tcp small servers j hostname Boaz enable secret 5 155 T E4 v86z708zMLehnIWA0T7LB l interface Ethernet0 description Boaz LAN workgroup interface ip address 172 16 96 1 255 255 224 0 ip access group 101 in no keepalive j interface Serial0 description Boaz WAN interface to Centr ip address 172 16 64 2 255 255 224 0 no fair queue interface Seriall no ip address shutdown l router igrp 11 network 172 16 0 0 ip host Centre 172 16 64 1 172 16 128 1 172 16 32 1 ip host Boaz 172 16 64 2 172 16 96 1 ip hos
198. link state algorithm Link state algorithms are also known as Dijkstras algorithms Link state routing uses the following e A topological database e The SPF algorithm and the resulting SPF tree e A routing table of paths and ports to each network e A link state advertisement LSA which is a small packet sent between routers that contains link information Link state routing requires more memory Routers send updates when there is a change in the table There is less network traffic because the routers are not sending updates every 30 or 90 seconds The routers in an area elect a Designated Router DR and a Backup Designated Router BDR When a change is made in the network the router that notices the change sends an update to the DR When an update occurs only the change is sent instead of the entire routing table The DR then sends the network change to all routers in the area with a multicast An important concept to mention is that routers that use a link state routing protocol develop a common view of the internetwork A link state protocol collects links from neighboring routers to create a routing table Students also need to understand that the updates from the routers contain information about the links These links can be locally connected or received from other routers Students also need to know that the updates are partial updates 6 3 Routing Protocols Overview 71 238 Essential Labs None Optional Labs None Core Tis
199. logies Web Links Network security issues http cisco com warp public 779 largeent issues security IP Telephony http Avww cisco com warp public 779 largeent learn technologies IPtelephony html Wireless solutions http www cisco com warp public 779 smbiz netsolutions find wireless shtml 193 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Appendix B Copyright 2004 Cisco Systems Inc B 2 7 Troubleshooting If symptoms stop If symptoms persist Figure 1 Steps in the Problem Solving Model Troubleshooting is a form of educational inquiry that is necessary in most Academy courses even if it is not formally taught There are literally over a hundred approaches to troubleshooting Figure LU shows one approach This is the preferred method for Cisco courses Instructors may use their own preferred method Troubleshooting and debugging skills are necessary for students who seek further education and employment in the IT industry Instructors will typically need to spend more time on lab preparation to teach students about troubleshooting However the overall benefit to the student is worth this investment Troubleshooting is used to identify and correct hardware software and programming problems One instructional troubleshooting method involves deliberately introducing a finite number of problems in a structured lab environment that have been experienced previously by the students W
200. lower metric CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 7 Copyright 2004 Cisco Systems Inc The lower the metric is the better the route Make sure that students understand that the default metrics for IGRP are bandwidth and delay The other metrics can be used but are not used by default Allow the students to configure IGRP on a mesh network and adjust the metrics to see how the routing table is changed Students should also be instructed to trace the path to a network before and after the metric changes to verify the different path selection 7 3 3 IGRP routes IGRP advertises three types of routes e Interior e System e Exterior Interior routes are defined as routes between subnets that are connected to the same router interface System routes are routes within the same autonomous system These routes are derived from directly connected networks and through routes learned from other IGRP routers System routes do not contain subnet information Exterior routes are routes between autonomous systems A gateway of last resort can be used to transfer information to a destination outside of a local autonomous system Describe the graphic included in the TI in depth Explain the concepts of interior routes and multiple subnets on the same router interface Autonomous systems should also be explained 7 3 4 IGRP stability features 88 238 Features designed to enhance the stability of IGRP consist of holddo
201. lyze and troubleshoot simple distance vector routing protocols e Use commands incorporated within IOS to analyze and rectify network problems e Describe the operation of the major transport layer protocols and the interaction and carriage of application layer data e Identify the application of packet control through the use of various access control lists e Analyze configure implement verify and rectify access control lists within a router configuration Course Overview 6 238 The course has been designed for 70 contact hours Approximately 35 hours will be designated to lab activities and 35 hours will be designated to curriculum content A case study on routing is required The format and timing should be determined by the Local Academy CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Course Overview Copyright 2004 Cisco Systems Inc The following changes have taken place since CCNA version 2 x e More emphasis on router configuration early in semester e More efficient presentation and practice of IOS e IGRP moved from CCNA 3 to CCNA 2 e Access lists moved from CCNA 3 to CCNA 2 e Revisions to TCP IP coverage e More focus on routing tables e Case study is required with format and timing determined by the Local Academy e More interactive flash activities e Sequence of over 40 e Labs e Lab focus on two router labs 7 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Course Overview Copyrigh
202. messages Identify a variety of ICMP control messages that are used in networks Determine the causes for ICMP control messages CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 8 Copyright 2004 Cisco Systems Inc 8 1 Overview of TCP IP Error Message Essential Labs None Optional Labs None Core Tis 8 1 1 8 1 2 8 1 4 8 1 5 8 1 6 and 8 1 8 Optional Tis 8 1 3 8 1 7 and 8 1 9 Course Level Claim Students can describe the operation of ICMP and identify the reasons types and format of associated error and control messages Hands on skills none 8 1 1 ICMP IP is considered a best effort or unreliable method for the delivery of network data If the data does not reach its destination the sender is not notified that the transmission has failed ICMP is the component of the TCP IP protocol stack that addresses the limitations of IP ICMP does not overcome the unreliability issues in IP but ICMP does allow for testing Reliability must be provided by upper layer protocols Explain the difference between a guaranteed method and a best effort This is a good time to show students how a successful ICMP works Introduce problems into the lab setup to demonstrate how ICMP relays messages in a network Explain that ICMP is a Layer 3 protocol of the TCP IP suite It is not an IP packet It uses the IP addressing scheme but has a different packet format than IP 8 1 2 Error reporting and error correction ICMP
203. n addresses so they should be placed as close to the destination as possible For example a standard ACL should be placed on Fa0 0 of Router D to prevent traffic from Router A Administrators can only place access lists on devices that they control A standard ACL should be placed close to the destination First have the students decide which router is closest to the destination and then pick which interface is the closest to the destination An ACL can be applied to any of the interfaces but if an ACL is applied to the wrong interface a negative result is possible The extended ACL should be placed closest to the source Have the students decide which router is closest and then choose the correct interface The in or out commands also need to be correct or the ACL will not work Students commonly forget to apply the ACL or filter in the wrong direction 11 2 5 Firewalls A firewall is an architectural structure that exists between the user and the outside world to protect the internal network from intruders A network firewall usually consists of several different machines that work together to prevent unwanted and illegal access ACLs should be used in firewall routers which are often positioned between the internal network and an external network such as the Internet ACLs must be configured on border routers which are routers situated on the boundaries of the network to provide security benefits CCNA 2 will cover standard extended and
204. n use the commands incorporated within IOS to analyze and rectify network problems Certification Level Claim Students can perform simple WAN troubleshooting Hands on skills none 9 3 1 Troubleshooting Layer 1 using show interfaces The Cisco IOS contains many troubleshooting commands The show commands are widely used The show interfaces command is used to check the status and statistics of the interfaces The show interfaces serial command displays the line and data link protocol status It also provides information to help diagnose other Layer 1 issues that are not as easy to determine These problems include line interruptions faulty switch faulty DSU or faulty router hardware Have the students view the results displayed by these commands and discuss the results to make sure they understand the output This is an important concept and valuable tool for troubleshooting 9 3 2 Troubleshooting Layer 2 using the show interfaces The show interfaces command is possibly the most important tool to discover Layer 1 and Layer 2 problems in the router The first parameter refers to the physical layer The second parameter indicates if the IOS processes that control the line protocol consider the interface to be usable This is determined by whether keepalives are successfully received If the interface misses three consecutive keepalives the line protocol is marked as down The show interfaces serial command should be used after a serial interfa
205. nd tell the students they can only talk to the people in their group This is similar to a protocol that uses autonomous system numbers It is possible for routers with different autonomous system numbers and different protocols to communicate if redistribution is used Redistribution will not be covered in this section CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 6 Copyright 2004 Cisco Systems Inc At this point students do not have to understand the details of an autonomous system They just need to understand the basic concepts of an autonomous system Students do not have enough experience to understand policy based routing 6 2 3 Purpose of a routing protocol and autonomous systems The goal of a routing protocol is to fill the routing table with known networks or destinations and the best route to reach these destinations Although routers can forward packets without a routing protocol configured using a protocol allows for dynamic updates The router can be configured with static routes When static routes are used the administrator must configure a route for each network Instruct the students to think of all the networks on the Internet and the different paths to each network Then instruct the students to think about how fast the Internet changes A routing protocol will dynamically learn routes to all networks even when the paths change The router knowledge needs to reflect an accurate consistent view of
206. net a given address space Base network address amp Mask Pair to any number of specified VLSM subnets EVENTS PARTNERS amp RESELLERS ABOUT CISCO Home Logged In Profile Contacts amp Feedback Help Site Map 1992 2003 Cisco Systems Inc All rights reserved Important Notices Privacy Statement and Trademarks of Cisco Systems Inc IP Subnet Calculator is a Web based resource that is used to calculate the subnet mask based on several variables This tool can be used to verify network settings http Avww cisco com cgi bin Support lpSubnet home p 161 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Appendix A Copyright 2004 Cisco Systems Inc 5 Password Recovery Procedures Solutions Products Ordering Support Partners Training Corporate Password Recovery Procedures Document ID 6130 Please provide your feedback on this document This page is the index of password recovery procedures for Cisco products Note For security reasons the password recovery procedures described here require physical access to the equipment High End Routers Cisco 12000 Series Routers Cisco 7100 Series Routers Cisco uBR 7200 Cisco AGS Cisco 7000 Series Routers Cisco uBR7100 Cisco 7500 Series Routers Route Processor Module Cisco 7000 Series Route Switch Cisco 7200 Senes Routers Cisco uBR10000 Processor RSP7000 LAN Switches EtherSwitch FastSwitch FastHub Catalyst 2100 Series Catalyst 2950 Series
207. ng protocols which forward their routing tables out to all routers in their area These routing tables include information about the total cost of a route and the logical address of the first router on the path to each network contained in the table Routers need to update the information in their routing tables to continuously make good path determination decisions Periodically changes in a network will affect the decisions made by a router For example a router may be taken off line for upgrades or repairs or an interface ona router may go down If routers are not aware of the changes that have occurred in a network they may switch packets to interfaces that are no longer connected to the best route Distance vector routing protocols typically send out updates at certain time intervals such as every 30 seconds for RIP Sometimes distance vector routing protocols initiate updates when topology changes occur For example IGRP sends out flash updates sooner than its standard update interval of 90 seconds 7 1 2 Distance vector routing loop issues 76 238 Routing loops can occur if slow convergence on a network causes inconsistent routing entries If a network goes down this information may not get propagated across the network quickly enough As a result a router may develop an incorrect view of the network and send out this incorrect information Use the following example in class e Just before the failure of Network 1 all routers ha
208. ng English http www etni org il ministry portfolio default htm 232 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Appendix B Copyright 2004 Cisco Systems Inc B 5 5 Oral exams Date Time Place Member Member Member Member Member Time 25 min slots 1 300325 ssas 4 00 4 25 ra30 465 5 00 525 fsa0 555 NOTE ANY MEMBER OF ANY GROUP MAY BE ASKED ANY OF THESE QUESTIONS 1 1 1 1 l A lc N i n A E N N A Learning Goals Encouraging students skills in quick recall of facts and concepts and thinking on their feet Assessing student understanding in ways deeper than multiple choice questions Learning professional standards for answering questions and articulating concepts orally under time pressure Engaging students multiple intelligencces and proviving a Figure 1 Oral Exams reer Prompt Time Limit Pitre best i given Point Value Sample Responses minutes to student Give the student a situation a school to be wired or a project they completed during the semester Choose media justifying your choice with a matrix Draw a simple physical topology locationg POP MDF IDF MCC ICC HCC backbone Justify all choices of locations Draw a simple flowchart of what you would do to design install and test the cabling you ve intalled Figure 2 Oral Exams 233 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide
209. ns of the different file types on the router e Describe the parts of the IOS name e Use TFTP and copy and paste to save and restore configuration files e Use TFTP to load an IOS image e Use XModem to load an IOS image e Use show commands to verify the file system 51 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 5 Copyright 2004 Cisco Systems Inc 5 1 Router Boot Sequence and Verification Essential Labs 5 1 3 and 5 1 5 Optional Labs None Core Tis All Optional Tis none Course Level Claim Students can Identify the stages of the router boot up sequence and show how the configuration register and boot system commands modify that sequence Certification Level Claim Students can describe the components of network devices Hands on skills none 5 1 1 Stages of the router power on boot sequence The purpose of the router boot up sequence is to verify the operation of hardware and load the correct IOS and configuration file The router must follow a predefined set of steps while it boots up When the router is first powered on it executes the power on self test POST These diagnostics are located in ROM and verify the proper operation of the router hardware If the router passes the POST the bootstrap loader in ROM executes The bootstrap basically indicates a starting point in memory that will load other instructions Now the router is ready to load the operating system which is Cisc
210. nt When it is received another three octets are sent If the data is not received due to overflowing buffers no acknowledgment is sent Therefore it is known that the data must be retransmitted and the transmission rate should be slowed To slow the transmission rate the window size can be reduced The transmitting host will transmit a smaller amount and wait on the acknowledgement before transmitting more segments Make sure the students understand the differences between these processes This will help them understand the entire TCP process One final but very important concept is that sequencing and acknowledgement numbers are handled on a session by session basis Each session between hosts uses its own unique set of sequencing and acknowledgement numbers 10 1 7 UDP operation The TCP IP protocol stack contains many different protocols Some are e IP provides connectionless unreliable transmission at Layer 3 e TCP provides connection oriented reliable transmission at Layer 4 e UDP provides connectionless unreliable transmission at Layer 4 Both TCP and UDP use IP as their underlying protocol TCP must be used when applications need to guarantee the delivery of a packet When applications do not need a guarantee UDP is used It is a faster connectionless delivery mechanism Stress to the students that UDP does not use windowing or acknowledgments and does not require sequencing numbers Application layer protocols provide more r
211. nt research supports certain practices and strategies that help teachers maximize student learning Instructional concepts such as student centered learning and brain compatible learning have emerged as powerful contributors to advanced student achievement These types of techniques are referred to as best practices The Academy teaching community consists of over 20 000 instructors Each instructor brings unique experiences and talents to the program This section presents options that have been successful for certain audiences and certain topics This section does not imply that all of these techniques apply equally well to all students in all curricula These techniques or best practices form the foundation for effective teaching and learning environments across the Academy curriculum The Academy program includes CCNA CCNP Fundamentals of UNIX Fundamentals of Voice and Data Cabling Fundamentals of Java Fundamentals of Web Design and IT Essentials The ideas presented in this module are taken from international sources such as kindergarten through high school community colleges universities instructional design and training models and the IT teaching community 167 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Appendix B Copyright 2004 Cisco Systems Inc Web Links International Society for Technology in Education http www iste org Southeast Center for Teaching Quality http www teachingquality or
212. ntains a cache of host name to address mappings for use by EXEC commands A host name resolution is the process a computer system uses to associate a name with a network address CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 3 Copyright 2004 Cisco Systems Inc Ask students the following questions e What is a host name is associated with e Can each unique IP address have a host name associated with it 3 2 7 Configuring host tables This is a simple process Students need to understand that the host table provides local host resolution 3 2 8 Configuration backup and documentation The configuration of network devices determines the behavior of a network The following tasks are used to manage device configurations e List and compare configuration files on devices e Store configuration files on network servers e Perform software installations and upgrades Configuration files should be stored as backup files Configuration files can be stored ona network server on a TFTP server or on a disk that is stored in a safe place Configuration backup files and documentation should be stored in a safe place in case there is a need to recover these files later For example the startup configuration of a router can be stored in another place such as ona network server or on a TFTP server as a backup If the router goes down the stored file could be placed back on the router This would minimize the down time Configu
213. o IOS The IOS can be found in flash TFTP or ROM The boot field of the configuration register will indicate the location of the IOS image After the operating system is loaded and operational the configuration file from NVRAM is loaded and executed If no configuration file exists in NVRAM the router will prompt the user to use a question driven setup menu Review the figure in this TI with the students This is an excellent visual representation of the different aspects of the boot process Each student should be able to reproduce this figure from memory Remove the configuration from NVRAM to demonstrate the process used to check for a TFTP server and then enter the setup menu Demonstrate the use of Ctrl C to exit from the setup menu 5 1 2 How a Cisco device locates and loads the Cisco IOS The router can load the Cisco IOS from several different locations that can be specified by the operator The boot system commands can be used to identify a fallback sequence of locations to look for the IOS 52 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 5 Copyright 2004 Cisco Systems Inc It is important to realize that these boot system commands must be saved in NVRAM to be executed at the next start up If no boot system commands are saved in NVRAM the router will use the default fallback process flash TFTP and finally ROM Review the figure in this section to explain the process that is followed to load the
214. o program one or more of the devices Students can work in teams to configure an entire topology or schedule individual time to practice new commands Since the NETLAB environment equipment is similar to the equipment used by Cisco Networking Academy programs students can practice configuration tasks just as they would with their Networking Academy equipment Since the NETLAB equipment can be accessed from any PC with a browser that is connected to the Internet students can perform these configuration tasks outside of the Academy 184 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Appendix B Copyright 2004 Cisco Systems Inc Students will usually access the equipment in the evening or on the weekends from their homes or another location with Internet access Some instructors may choose to implement use of the NETLAB system within the classroom This is especially useful when students are just beginning to learn new configuration tasks Instructors can use the instructor led lab features of NETLAB to lead the class through a lab During instructor led sessions the instructor can issue configuration commands to one or more devices while students shadow the Telnet session of the instructor Another way instructors can use NETLAB within the classroom is the team approach A team of students is given an assignment to configure one or more of the routers in a topology The team can use NETLAB to share access and control over the ro
215. o there is no need to focus on the show command in this TI A router and switch cannot function without an operating system Cisco IOS is the installed software in all Cisco routers and Catalyst switches A computer needs an operating system such as Windows or UNIX Discuss how the hardware cannot function without this software Make sure the students understand the role of the IOS 2 1 2 Router user interface Cisco IOS software uses a command line interface CLI as its console environment The CLI is accessible through several methods e Console port e Auxiliary port e Telnet session Students should know the difference between these methods They should also be comfortable with the term CLI 2 1 3 Router user interface modes 19 238 The user EXEC mode allows a limited number of basic monitoring commands This mode is often referred to as a view only mode The privileged EXEC mode provides access to all router commands To enter the privileged mode from user mode the enable command must be entered The privileged mode is used to access other modes to configure the router CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 2 Copyright 2004 Cisco Systems Inc Students should be able to identify the router prompts The user mode prompt is Router gt The privileged mode prompt is Router 2 1 4 Cisco IOS software features Cisco IOS devices have three operating environments e ROM monitor e Boot ROM e C
216. ocols Some protocols such as RIP use only the metric of hop counts Other routing protocols may use bandwidth delay and other factors If the only metric used by a routing protocol is hop count then a router makes its path determination decisions based on the lowest number of routers that a packet will have to pass through to reach its destination The maximum hop count value defines how many routers a packet can pass through before the destination network is unreachable Each time a packet passes through a router the distance number is increased When the default or defined maximum is reached the network is considered unreachable and the looping ceases A non technical example is a timed test If someone takes a timed test they have a predefined amount of time to complete it When the maximum amount of time has been reached the test ends even if some questions have not been answered 7 1 4 Eliminating routing loops through split horizon Another possible source for a routing loop occurs when incorrect information that has been sent back to a router contradicts the correct information that it sent The following example explains how this problem occurs 1 Router A passes an update to Router B and Router D that indicates that Network 1 is down Router C transmits an update to Router B that indicates that Network 1 is available at a distance of four by way of Router D This does not violate split horizon rules 2 Router B incorrectly conclude
217. ongestion on a network is dropped packets that result in a loss of data To reduce data lost ICMP messages must be sent to the source of the congestion This type of ICMP message is called a source quench message The source quench message notifies the sender of the congestion and asks the sender to reduce its rate This usually reduces the congestion The rate of transmission will slowly increase if no other source quench messages are received One way ICMP source quench messages might be used effectively is in a SOHO Develop an example of network congestion Have the students come up with their own ideas about the factors that cause network congestion CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 8 Copyright 2004 Cisco Systems Inc Module 8 Summary Before students begin Module 9 they should know where to look for many of the error messages they may encounter Online assessment options include the end of module online quiz in the curriculum and the online Module 8 exam This is a very descriptive module so vocabulary or scenario based quizzes may be the preferred form of assessment Students should understand the following main points IP is a best effort delivery method that uses ICMP messages to alert the sender that the data did not reach its destination ICMP echo request and echo reply messages allow the network administrator to test IP connectivity to aid in the troubleshooting process ICMP messages
218. onsole Hands on skills none 4 1 1 Introduction to CDP CDP is a Cisco proprietary protocol that is used for Layer 2 troubleshooting and network documentation CDP is used to acquire protocol and platform information from neighboring devices It is enabled by default on Cisco devices and requires all media that is used to be Subnetwork Address Protocol SNAP enabled Most media is SNAP enabled During the boot up process each Cisco device sends CDP advertisements to a multicast address to collect information from its neighbors These advertisements are periodically repeated so that updated information can be gathered CDP advertisements are also used by the receiving devices to learn about the sender CDP information is dynamic It is constantly updated through periodic advertisements Reporting devices provide a Time to Live TTL value for the data CDP operates at Layer 2 and is upper layer independent Review Figure 1 with students CDP allows each Cisco device to collect information from its neighbors regardless of the Layer 3 protocols the devices are configured to use Discuss the following characteristics of CDP e CDP runs on all Cisco devices such as routers switches and bridges e CDP is Cisco proprietary e CDP is upper layer independent e CDP information is exchanged only by directly connected neighbors Students may not be familiar with multicasting A brief explanation may be required at this point The following link pro
219. oot the topology and correct any problems they find Emphasize the fact that the show run command which makes it easy to troubleshoot problems in a lab may not be very effective in real situations The show run command should be used to verify configuration changes CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 7 Copyright 2004 Cisco Systems Inc Module 7 Summary Before students begin Module 8 they must be able to configure and troubleshoot RIP and IGRP by themselves Online assessment options include the end of module online quiz in the curriculum and the online Module 7 exam Formative skill assessments such as timed competitions to see who can get hands on or e Lab routing to work the fastest should be used The emphasis of any assessment should be on the ability to demonstrate mastery Students should understand the following main points How routing information is maintained through distance vector protocols How routing loops occur in distance vector How to define a maximum to prevent count to infinity How to eliminate routing loops through split horizon Route poisoning How to avoid routing loops with triggered updates How to prevent routing loops with holddown timers How to prevent routing updates through an interface Load balancing across multiple paths RIP process RIP configuration The ip classless command Common RIP configuration issues Load balancing with RIP How to integrate stati
220. operating properly 38 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 3 Copyright 2004 Cisco Systems Inc Module 4 Learning about Other Devices Overview Module 4 will introduce students to the Cisco Discovery Protocol CDP CDP is enabled by default on all Cisco devices CDP allows devices such as Cisco routers to obtain information about directly connected routers switches and bridges CDP functions at Layer 2 in the OSI model It operates independently of Layer 3 which means that devices can gather information about other directly connected devices regardless of network layer protocol issues The first lesson will explain how CDP is used to acquire information about neighboring routers Students should already know how use serial and Ethernet connections to physically connect routers Students should also know how to use programs such as HyperTerminal and Telnet to perform router configuration tasks Review these skills if necessary Have students perform a standard lab setup configuration as an optional skill review The second lesson will introduce students to the TCP IP protocol Telnet Telnet is a remote connection utility that allows network administrators to perform configuration and management tasks on routers and switches Students will learn how to establish manage and terminate Telnet sessions with remote devices Students should already be familiar with basic router setup and configuration Student
221. or this type of learning Students are divided into three groups which are called home groups Each group is assigned a number or a name The content to be learned is broken into three sections The content is distributed so each home group receives one of the three sections of content The use of color codes is a useful technique to implement within this activity Three different colors are used to distinguish between the three content sections to be learned Members from each group move to an expert group where the main points of the content are discussed Members of the expert group process this new information and return to their home groups to teach other members the main points of what they learned from the activity Research states that this is one technique that stimulates significant learning within the brain since it requires critical analysis and articulation before the acquired knowledge can be taught to others Web Links Training How To Do Tasks http www cvm tamu edu wklemm logic10 html 211 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Appendix B Copyright 2004 Cisco Systems Inc B 4 5 Ask the right questions H Q P Q Question Asked P Prompt Breaks Silence T Wait Time Figure 1 Ask the Right Questions In classrooms and labs across the United States students are typically given questions that test their low level and high level cognitive abilities Instructors who ask low level questions ex
222. ormation an administrator must configure at least one router with a default route 102 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 9 Copyright 2004 Cisco Systems Inc An administrator can use two different commands to configure default routes e ip route 0 0 0 0 0 0 0 0 next hop ip address exit interface e ip default network The ip default network command establishes a default route in networks with dynamic routing protocols Discuss the important concept of the gateway of last resort and the two commands used to configure default routes Have the students brainstorm and present their ideas on why routers do not maintain routes to every possible destination to the class One thing the students should know is that the ip route 0 0 0 0 0 0 0 0 command is referred to as the quad zero route 9 1 3 Determining route source and destination Path determination occurs at the network layer which is Layer 3 The path determination function enables a router to evaluate the available paths to a destination and to establish the preferred way to handle a packet The network layer provides best effort end to end packet delivery The network layer uses the IP routing table to send packets from the source network to the destination network Discuss Layer 3 of the OSI model as a review This should be a concept that the students have already mastered 9 1 4 Determining L2 and L3 addresses While network layer addres
223. ortant concept for the students to understand to help in the troubleshooting process In the output of the show ip route command clarify the values that represent the administrative distance metric next hop interface and the update time In the show protocols output clarify the values that represent the update timers the networks being routed and the routing sources 9 3 6 Troubleshooting using show controllers The show controller serial command can be used to identify the type of cable that is connected to the routers without inspecting the cables This can be used to find a serial interface with no cable the wrong type of cable or a defective cable The show controller serial command queries the integrated circuit chip that controls the serial interface and displays information about the physical interface It also produces a tremendous amount of output which includes the cable type Most of the output is internal technical details about the controller chip status This information requires specific knowledge of the integrated circuit This is an important concept for the students to understand to help in 108 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 9 Copyright 2004 Cisco Systems Inc the troubleshooting process Students need to realize that there is a lot of output that will be completely unfamiliar to them The two main reasons for them to use this command are to discover the cable type connected
224. otoshop Adobe Illustrator Adobe GoLiveTM Adobe LiveMotionTM and Adobe Premiere This course has been designed as a 70 hour course However since it uses five Adobe applications it may be beneficial to use a 190 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Appendix B Copyright 2004 Cisco Systems Inc longer delivery model or some pre selection and screening of students About half of the course time is spent on the instructor facilitated online multimedia material and the rest is spent on lab exercises Web Links Instructor Community New Courses http cisco netacad net cnacs prot doc new_courses html 191 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Appendix B Copyright 2004 Cisco Systems Inc B 2 6 Emerging technologies Figure 1 PIX Firewall PhotoZoom Figure 2 IP Phone 192 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Appendix B Copyright 2004 Cisco Systems Inc iD MeN CPUE JIL P E mimin aja Figure 3 Wireless LAN In the future new technologies such as network security IP telephony and wireless LANs may be the basis for Academy courses Each of these courses will have an associated lab bundle which will allow for the successful implementation of the labs The goal of these course will be to train professionals who can implement network security LI IP telephony 2 wireless LANs 3 and other networking techno
225. outer network 192 168 1 0 RouterA config router igrp 101 RouterA config router no network 192 168 1 0 The autonomous system number is used to identify the router to other IGRP routers and to tag routing information Have the students configure IGRP on the lab topology 7 3 6 Migrating from RIP to IGRP With the creation of the IGRP in the early 80s Cisco Systems was the first company to solve the problems associated with RIP IGRP was designed to have a greater maximum hop count which gave it more scalability for larger companies IGRP uses multiple metrics to determine the best path bandwidth and delay as opposed to the hop count metric used by RIP As a result of these improvements IGRP enabled many large complex and topologically diverse internetworks to be deployed Have the students configure the lab topology with RIP and then migrate to IGRP Make sure that students understand that RIP is still the most implemented routing protocol in smaller internetworks Also emphasize that IGRP can only be used ina fully Cisco environment 7 3 7 Verifying IGRP Configuration 89 238 The following commands and available switches can be used to verify the configuration of IGRP e show interface e show ip protocol e show ip route e show running config The show interface command can be used to verify issues that are specifically related to the interface configuration such as the ip address physical connectivity and keepalives The
226. ow lth 1992 2003 Cisco Systems Inc All rights reserved Important Notices Privacy Statement and Trademarks of Cisco Systems Inc The Software Bug Toolkit is a Web based resource that is used to search for software bugs based on version and feature sets The toolkit can be used to determine why a feature does not work http Awww cisco com cgi bin Support Bugtool launch bugtool p 160 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Appendix A Copyright 2004 Cisco Systems Inc 4 IP Subnet Calculator Profile Contacts amp Feedback Help Site Map Select a Location Language Technical Support y B co Cisco SYSTEMS STIG AETEIBETS Search TECHNICAL SUPPORT IP Subnet Calculator Search All Cisco com ba SUBNETS SUPERNETS CIDR Toolkit This tool provides a way to calculate IP subnetting which is fast easy and error free Choose a function by clicking below or by selecting one of the tabs above Feedback Help Subnets Related Tools This tab will help calculate all ofthe possible Subnets a given address space Base network address amp Mask pair can be Subnetted by TAC Case Open specifying the number of subnets required hosts per subnets or the subnets mask TAC Case Query 2600 3600 3700 Memory Supernet CIDI Caladar This tab will help you calculate Classless Interdomain Routing CIDR route for a given address CIDR mask pair VLSM This tab will help variably Sub
227. pect students to respond with basic recall of facts and comprehension based on information they heard in a lecture or read from the curriculum An example of a low level question is to ask students to name the levels of the food pyramid or list the elements on the periodic table This is the most common type of question that students are asked in schools High level questions are more open ended and interpretive Students are required to analyze and synthesize information With high level questions students are asked to communicate their knowledge through logic reasoning and evidence An example of a high level question is to ask students to predict the next world epidemic or explain why rockets cannot launch into outer space in extremely cold weather The average wait time for teachers after they ask a question in a classroom is approximately 1 5 seconds Research indicates that with just a 3 second waiting period student answers are more accurate and organized Instructors should ask students questions about the concepts that they will continue to understand long after the little details fade away from their short term memories These concepts will require teachers and students to reflect on the intrinsic value of the questions that they ask and the truths that these questions may uncover The late Dr Mary Budd Rowe was an accomplished science educator at the University of Florida and Stanford University Dr Rowe studied classroom dynamics One of
228. perators to verify VTP domain configuration in adjacent network nodes Native VLAN TLV CDPv2 Indicates the assumed VLAN for untagged packets on each interface and is implemented only for interfaces the support the IEEE 802 1Q protocol Full or Half Duplex TLV Indicates the status duplex configuration of a CDP broadcast interface and is used by network administrators to diagnose connectivity problems between adjacent network devices The show cdp neighbors command displays CDP information collected by a device about its neighbors It can be issued at a console connected to a Cisco network device Demonstrate the show cdp neighbors command and the show cdp neighbors detail command Note that much of the information outlined in the table can only be seen if the detail option is utilized This command variation is seen in subsequent RIOs Some information is only displayed with CDP v2 which is implemented with IOS version 12 0 3 T Demonstrate how the show cdp neighbors command and its variations can be consoled into a router that is connected to another router or a switch to show students the output The show cdp neighbors command allows students to perform the associated Flash e Lab CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 4 Copyright 2004 Cisco Systems Inc 4 1 3 Implementation monitoring and maintenance of CDP CDP implemented by default on all interfaces that support it The following ta
229. point indicates that a datagram has been successfully downloaded 5 2 6 Managing IOS images using XModem 58 238 If the IOS image in flash has been erased or corrupted the IOS may need to be restored from ROM monitor mode ROMmon First the flash should be examined with the dir flash command If an image appears to be valid an attempt should be made to boot from that image This is done with the boot flash command If the router boots properly then the students should determine why the router booted from the ROMmon prompt instead of flash The show version command can be used to check the configuration register Students can use the show startup config command to see if there is aboot system command that instructs the router to use the IOS to monitor ROM If the router will not boot properly a new IOS image will need to be downloaded The IOS file can be recovered with one of the following methods e Use xmoden to restore the image through the console e Use TFTP from the ROMmon mode to download the image To restore the image through the console the local PC needs to have a copy of the IOS file to restore and a terminal emulation program CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 5 Copyright 2004 Cisco Systems Inc The default console speed of 9600 bps can be used or it can be changed to 115200 bps This will speed up the download The console speed can be changed with the confreg command To
230. puts Phase 5 Documenting the Network Sample outputs Boaz 2500 Configuration Management documentation Boaz 2500 Boaz show cdp neighbors Capability Codes R Router T Trans Bridge B Source Route Bridge S Switch H Host I IGMP Device ID Local Intrfce Holdtme Capability Platform Port ID Centre Ser 0 120 R 2500 Ser 0 Boaz show ip route Codes C connected S static I IGRP R RIP M mobile B BGP D EIGRP EX EIGRP external O OSPF IA OSPF inter area El OSPF external type 1 E2 OSPF external type 2 E EGP i IS IS Ll IS IS level 1 L2 IS IS level 2 candidate default U per user static route Gateway of last resort is not set 172 16 0 0 16 is subnetted 4 subnets I 172 16 128 0 100 10476 via 172 16 64 1 00 00 20 Serial0 I 172 16 32 0 100 8576 via 172 16 64 1 00 00 20 Seriald Cc 172 16 96 0 is directly connected Ethernet0O G 172 16 64 0 is directly connected Serialo0 Boaz show ip protocols Routing Protocol is igrp 11 Sending updates every 90 seconds Invalid after 270 seconds Outgoing update filter hold down 280 list for all next due in 34 seconds flushed after 630 interfaces is not set Incoming update filter list for all interfaces is not set Default networks flagged in outgoing updates Default networks accepted from incoming updates IGRP metric weight K1 1 K2 0 K3 1
231. r example in cpa25 cg 1 cpa25 is the Cisco Pro 2500 Router cg is the feature capability such as communication server remote access server or ISDN and the 1 is the run location or compressed status Explain that it is important to install and maintain various IOS versions especially newer versions with advanced features Encourage the students to conduct research online at www cisco com for more information on how to obtain various IOS images 20 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 2 Copyright 2004 Cisco Systems Inc 2 2 Starting a Router Essential Labs 2 2 1 2 2 4 and 2 2 9 Optional Labs None Core Tis All Optional Tis none Course Level Claim Students can describe the purpose and fundamental operation of the router IOS Certification Level Claim Students can establish communication between a terminal device and the router IOS and use it for system analysis configuration and repair Hands on skills none 2 2 1 Initial startup of Cisco routers This section teaches students about the startup process for a router Students learn how to establish a HyperTerminal session and log into a router Students will then be introduced to the help feature and enhanced editing commands When a Cisco router powers up it performs a POST This executes diagnostics from ROM on all hardware modules After the POST the following events occur as the router initializes e Bootstrap is loaded from
232. r simple solutions first when they test a network Some of the most common problems on IP network result from errors in the addressing scheme Reinforce how important IP addressing schemes are to a network Explain to students that a large part of their role in the workplace will require troubleshooting 9 2 2 Using a structured approach to troubleshooting Troubleshooting is a process that allows a user to find problems in a network There should be a structured or orderly process to troubleshooting based on the networking standards defined by an administration Documentation is a very important part of the troubleshooting process Emphasize to the students that documentation is important but probably the least performed task in network management Have the students brainstorm ideas about why a structured approach is important to troubleshooting Discuss the ideas with the class Emphasize the two structured approaches explained in the curriculum Since these are not the only two approaches instruct the students to work in groups and develop their own structured approaches to troubleshooting The students need to understand that the troubleshooting process can create additional problems To prevent this make sure students know that they should reverse any processes they use to solve the issue Failure to do so can add to the network problems 105 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 9 Copyright 2004 Cisco
233. ration management is an important aspect of network management The backups of the configurations should be current and maintained in multiple locations These backups should be available for maintenance and troubleshooting but protected from unauthorized access Configurations can be used by hackers to gain useful information about a network infrastructure Ask students the following questions e What is the purpose of configuration backup and documentation e Where can the configuration files be stored e What would minimize the down time of a router 3 2 9 Backing up configuration files 36 238 A current copy of the configuration can be stored ona TFTP server The copy running config tftp command can be used to store the current configuration on a network TFTP server A router can be configured by loading the configuration file stored on one of the network servers The configuration of a router can also be saved to a disk or hard drive by CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 3 Copyright 2004 Cisco Systems Inc capturing text in the router If the file needs to be copied back to the router it can be pasted into the router Ask students the following questions e What is the command used to copy RAM to NVRAM e What is the command used to copy NVRAM to RAM 37 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 3 Copyright 2004 Cisco Systems Inc Module 3 Summary
234. re are eight intelligences that people have a predetermined strength to use e Verbal Linguistic intelligence allows students to understand verbal and written forms of words Students with strong verbal linguistic intelligence easily recognize sounds languages and inflections of speech e Logical Mathematical intelligence allows students to understand and interact with numbers symbols and patterns especially within the disciplines of math and science 173 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Appendix B Copyright 2004 Cisco Systems Inc e Bodily Kinesthetic intelligence gives students a strong connection to new content through the movement and manipulation of body and external objects Activities help students create cognitive connections for easy recall and comprehension e Musical Rhythmic intelligence centers around melody tune pitch rhythm and patterns found in types of music or cadence For some students music presents an environment that fluctuates from peaceful to highly energetic Their brains respond accordingly and the recall of new information becomes tied to a specific rhythm or cadence e Visual Spatial intelligence is based on the ability to recognize and respond to visual content through written words or artistic designs Visual Spatial strength helps students interpret maps and charts and form mental images of information that is communicated by another person e Intrapersonal int
235. restore the IOS image from the PC students should use the xmodem command The format of the command is xmodem c image_file_name The c instructs the Xmodem process to use CRC to check for errors during the download The router then sends a warning message that the bootflash will be erased Now the Xmodem transfer needs to be started from the terminal emulator Instruct students to select Transfer gt Send and then specify the image name and location in the Send File popup Select the xmodem protocol and start the transfer After the download is complete the console speed must be changed back to 9600 bps and the configuration register should be changed back to 0x2102 This is done with the confreg 0x2102 command 5 2 7 Environment variables The IOS can also be restored from a TFTP session The fastest way to restore an IOS image from the router is to use TFTP from ROMmon to download the image This is done with the tf tpdnid command The environmental variables provide a minimal configuration To seta ROMmon environment variable the name is typed followed by an equal sign and the value for the variable All variable names are case sensitive The minimum variables required to use the t tpdnld command are as follows e The IP address of the LAN e The subnet mask e The default gateway e The IP address of the TFTP e The IOS filename on the server Discuss these procedures with the students and make sure they understand each concept Also
236. rive out of order to the destination The sequence numbers indicate the correct order in which to put the bytes back together Also mention that UDP does not use sequencing numbers Sequencing numbers also act as reference numbers so that the receiver knows if it has received all of the data and can identify any missing pieces so the sender can retransmit them Explain that this offers increased efficiency since the sender only needs to retransmit the missing segments 10 1 6 Positive acknowledgements A common step in sliding windows synchronization and data sequencing is acknowledgment An acknowledgment field follows the sequence number field TCP uses acknowledgement and retransmission to control data flow and confirm data delivery This is a good time to stress the main difference between IP and TCP IP has no verification method to determine that data has reached its destination Positive acknowledgment and retransmission PAR is a common technique that is used to provide reliability With PAR the source sends a packet starts a timer and waits for an ACK before the next packet is sent If the timer expires the source retransmits the packet and starts the timer again TCP uses expectational acknowledgments in which the acknowledgement number refers to next octet that is expected Windowing is also a flow control mechanism If there is a window size of three the source can send three octets to the destination It then waits for an acknowledgme
237. rograms Web Links Disabilities Teaching Strategies and Resources http www as wvu edu scidis sitemap html 177 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Appendix B Copyright 2004 Cisco Systems Inc B 1 9 Learning disabilities What are some words commonly associated with learning diabilities Dyslexia perhaps the most commonly known is primarily used to describe difficulty with language processing and its impact on reading writing and spelling Dysgraphia involves difficulty with writing Problems might be seen in the actual motor patterns used in writing Also characteristic are difficulties with spelling and the formulation of written composition Dyscalculia involves difficulty with math skills and impacts math computation Memory of math facts concepts of time money and musical concepts can also be impacted Dyspraxia Apraxia is a difficulty with motor planning and impacts upon a person s ability to coordinate appropriate body movements Auditory Discrimination is a key conponent of efficient language use and is necessary to break the code for reading It involves being able to perceive the differences between speech sounds and to sequence these sounds into meaningful words Visual Perception is critical to the reading and writing processes as it addresses the ability to notice important details and assign meaning to what is seen Attention Deficit Hyperactivity Disorder ADD ADHD may
238. ropriate service Port numbers are used to keep track of different conversations that cross the network at the same time Port numbers are needed when a host communicates with a server that uses multiple services Both TCP and UDP use port numbers to pass information to the upper layers Software developers use the well known port numbers defined in RFC1700 Conversations that do not involve applications with well known port numbers are assigned port numbers that have been randomly selected from a specific range Port numbers have the following ranges e Numbers below 255 are used for public applications e Numbers from 255 1023 are assigned to marketable applications e Numbers above 1023 are unregulated A good analogy to help students understand this process is a post office box number Each piece of mail is sent to a zip code city and then a P O Box Similarly the IP address and transport layer send the packet to the correct server but the port number guarantees that the packet will contact the correct application 115 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 10 Copyright 2004 Cisco Systems Inc 10 2 2 Ports for services Services that are used on hosts must have a port numbers assigned so communication can occur Some ports are reserved in both TCP and UDP These are considered well known ports Students must know these port numbers Explain to the student that a question mark can be used in the
239. rts e The serial interface for management is asynchronous and the serial WAN interface is synchronous Ask students the following questions e Which port is preferred for troubleshooting and why e Do all routers have an auxiliary port 1 2 5 Console Port Connections The console port is a management port used to provide out of band access to a router It is used for the initial configuration of the router monitoring and disaster recovery procedures 15 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 1 Copyright 2004 Cisco Systems Inc Students may not be familiar with the term out of band Out of band refers to the fact that the management control communications use a different path or channel than the data communications Ask students the following questions e What type of terminal emulation must the PC or terminal support e What are the steps to connect the PC to a router 1 2 6 Connecting Router LAN interfaces In most LAN environments an Ethernet or FastEthernet interface is used to connect the router to the LAN The router is a host that connects to the LAN through a hub or a switch A straight through cable is used to make this connection The correct interface must be used If the wrong interface is connected the router or other networking devices may be damaged This is generally not true within LAN interfaces However if LAN interfaces are connected to some form of WAN interface such as
240. s are as follows Technology operations and concepts 168 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Appendix B Copyright 2004 Cisco Systems Inc e Planning and designing learning environments and experiences e Teaching learning and curriculum e Assessment and evaluation e Productivity and professional practice e Social ethical legal and human issues The ISTE has also developed the National Educational Technology Standards for Administrators NETS A Administrators must be prepared to lead the way to systemic reform Based upon a U S consensus a recognized set of indicators are used within school systems that utilize technology effectively The following six categories encourage strong leadership in the area of information technology e Leadership and vision e Learning and teaching e Productivity and professional practice e Support management and operations e Assessment and evaluation e Social legal and ethical issues Web Links ISTE website http www iste org B 1 3 Literacy math and science standards Since the late 1980s states and school districts across the United States have begun to raise standards in core subjects Academic standards are now used to clearly identify what students should learn and what teachers should teach State and local standards keep the education system accountable for student achievement As state standards have gained momentum educators have reach
241. s in place the team leader assigns the technician to develop a prototype for the new internetwork Use the network address assigned along with the subnetting requirements to subnet the network From the IP addressing scheme assign IP addresses to the appropriate interfaces on all routers and computers in the internetwork Use the diagram below as a guide Obtain approval of this phase of development from the team leader before proceeding to Phase 3 Instructor approval Date Network Diagram IP Addressing Network Address of Subnets Subnet Mask Server 1 Address Server 1 Address Default Gateway Default Gateway Router Interface IP Address Router Interface Router Interface DCE or DTE DCE or DTE IP Address IP Address Router Interface DCE or DTE Router Interface IP Address DOE or DTE IP Address l Router Interface l Router Interface IP Address IP Address Workstation 3 IP Address 4 Workstation 5 IP Address Workstation 4 IP Address r Workstation 6 IP Address Default Gateway y Default Gateway 132 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Case Study Copyright 2004 Cisco Systems Inc Phase 3 Basic Router and Workstation Configuration After the team leader inspects the prototype cabling the technician is assigned to create a basic configuration on the router and workstations Use the diagram and planning sheets to create a basic configuration for
242. s is an important concept to help the student understand causes of ICMP destination unreachable messages 8 1 8 Destination unreachable message Hardware failures improper protocol configuration disabled interfaces and incorrect routing information are some of the reasons for unsuccessful delivery of data Give the students examples similar to the figures in the curriculum Specify values and indicate the reason for each failure Explain that the students must understand the various causes of ICMP destination unreachable messages to effectively troubleshoot an IP network 8 1 9 Miscellaneous error reporting Devices that process datagrams may not be able to forward a datagram due to some type of error in the header The error does not relate to the state of the destination host or network but it will still prevent the datagram from being processed and delivered 96 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 8 Copyright 2004 Cisco Systems Inc 8 2 TCP IP Suite Control Messages Essential Labs None Optional Labs None Core Tis None Optional Tis All Course Level Claim Students can describe the operation of ICMP and identify the reasons types and format of associated error and control messages Hands on skills none 8 2 1 Introduction to control messages ICMP is an integral part of the TCP IP protocol suite All IP implementations must include ICMP support for the following reasons
243. s should possess basic router configuration skills and be able to physically connect the devices Students will use embedded Layer 3 through Layer 7 protocols to establish test suspend or disconnect connectivity to remote devices from the router console Module 4 Caution Most students do not understand that CDP and Telnet are powerful troubleshooting tools At this point it is important to provide additional support for students who have not mastered Module 3 Cover this module extensively Many of the next modules are lab intensive and time intensive Students who complete this module should be able to perform the following tasks e Enable and disable CDP e Usethe show cdp neighbors command e Determine which neighboring devices are connected to which local interfaces e Use CDP to gather network address information about neighboring devices e Establish a Telnet connection e Verify a Telnet connection e Disconnect from a Telnet session e Suspend a Telnet session e Perform alternative connectivity tests 39 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 4 Copyright 2004 Cisco Systems Inc e Troubleshoot remote terminal connections 4 1 Discovering and Connecting to Neighbors Essential Labs 4 1 4 and 4 1 6 Optional Labs None Core Tis All Optional Tis none Course Level Claim Students can use embedded data link layer functionality to perform network neighbor discovery and analysis from the router c
244. s that Router C still has a valid path to Network 1 ata less favorable metric Router B sends an update to Router A to inform Router A of the new route to Network 1 3 Router A now determines that it can send to Network 1 by way of Router B Router B determines that it can send to Network 1 by way of Router C and Router C determines that it can send to Network 1 by way of Router D Any packet that is introduced into this environment will loop between routers 4 Split horizon attempts to avoid this situation As shown in Figure 1 if a routing update about Network 1 arrives from Router A Router B or Router D cannot send information about Network 1 back to Router A Split horizon reduces incorrect routing information and reduces routing overhead 2 78 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 7 Copyright 2004 Cisco Systems Inc 79 238 B Do not update Router A about routes to network 1 D Do not update Router A about routes to network 1 Figure 1 Routing Update Router 2 Router 1 Figure 2 Split Horizon Split horizon is another mechanism to help prevent routing loops Split horizon does not allow the originator of network information to receive updates about the network from another router This prevents the originator of correct information from being influenced by the incorrect information of another router Use the figure in this section for reference If Router 2 sends
245. s that packets take when they travel to their destination The traceroute command can also be used to test the network layer on a hop by hop basis The traceroute command output shows a list of hops that the traceroute successfully reaches Traceroute output can also be used to indicate the specific hop at which the failure occurs Traceroute also provides output that indicates the relative performance of the links There must be routes in both directions for the traceroute or ping data to successfully make a round trip between routers This is an important concept for the students to understand to help in the troubleshooting process Help students associate traceroute with determining actual path 9 3 5 Troubleshooting routing issues The show ip route command is perhaps the most important command for troubleshooting routing issues This displays the contents of the IP routing table The output shows the entries for all known networks and subnetworks and how that information was learned If the output of the show ip route command does not show the expected learned routes then it is possible that routing information is not being exchanged In this case use the show ip protocols command on the router to check for a possible misconfigured routing protocol The show ip protocols command output can be used to diagnose a multitude of routing issues It can be used to identify a router that is the source of incorrect router information This is an imp
246. ses There are many different versions and different features to meet the requirements of a network Students should know that the show version command shows much more than just the version of the IOS This is an important command Explain to students is that this is the only command that can be used to examine the configuration register CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 2 Copyright 2004 Cisco Systems Inc Module 2 Summary 25 238 Before students move on to Module 3 they must be able to interact with the router through a HyperTerminal session and the CLI Online assessment options include the end of module online quiz in the curriculum and the online Module 2 exam Make sure students know how to access the command line prompt Formative assessments related to lab work are relevant to Module 2 Students should understand the following main points Understand the basic operation of IOS Identify various IOS features Identify methods to establish a CLI session with the router Use HyperTerminal to establish a CLI session Log into the router Use the help feature in the command line interface Use the enhanced editing commands Use the command history Troubleshoot command line errors Use the show version command CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 2 Copyright 2004 Cisco Systems Inc Module 3 Configuring a Router Overview When teaching Module 3 emph
247. ses are used to get packets from their source to destination it is important to understand that a different type of address is used to get packets from one router to the next For a packet to get from the source to the destination both Layer 2 and Layer 3 addresses are used Explain how important this concept is for the students to understand The Layer 3 address is used to route a packet from the source network to the destination network The source and destination IP addresses remain the same The MAC address changes at each hop or router A data link layer address is necessary because the source host must have a way to address the next hop router to which the packets are being forwarded For students to understand the routing process the Layer 2 and 3 addresses must be understood Be sure to review the various names for IP addresses such as a Layer 3 address a network layer address or a logical address Review the same concept for a MAC address that it is also called a Layer 2 address a data link address or a physical address It is also important to understand that the MAC will change while the IP will remain the same Remind the students that the packet will remain intact from the source host to destination host At each hop along the path a new frame is created and addressed in the frame to the next hop 9 1 5 Determining route administrative distance One of the most intriguing aspects of Cisco routers is how the router chooses which route
248. sh connections DoS attacks are commonly used by hackers to halt system responses One example is SYN flooding which occurs during the three way handshake process As a packet with the SYN bit set is sent it includes its IP address and the destination IP address This information is then used by the destination host to send the SYN ACK packet back In the DoS attack the hacker initiates a synchronization but spoofs the source IP address The destination device responds to a non existent unreachable IP address and is placed in a waiting state This waiting state is placed in a holding area that uses memory Hackers flood the host with these false SYN requests to deplete all the connection and memory resources of the host To defend against these attacks system administrators may decrease the connection timeout period and increase the connection queue size This is an important concept for the students to understand to help prevent hackers from creating chaos in a network 10 1 4 Windowing and window size Data is often too large to be sent in a single data segment TCP breaks data into segments A good analogy is small children who cannot eat large pieces of food Their food must be cut into smaller pieces to be eaten Another way to explain the advantages of this segmentation is to ask the students to imagine a 200 MB file that needs to be transferred Ask students the following questions e What if networking did not allow the file to be segmented
249. sses and ports Consider the use of network analysis or protocol sniffing software such as Fluke Protocol Inspector to analyze the operation of TCP on live networks Module 10 Caution TCP was introduced in CCNA 1 but there is much more detail in this section Students need to understand TCP TCP ports and sessions are the foundations of network performance control and security This is very challenging material for students who are still trying to separate the functions of Layer 2 headers Layer 3 headers and Layer 4 headers The numbering of bytes in the back and forth exchange of SYN and ACK in TCP is difficult to understand Work out examples for students Students who complete this module should be able to perform the following tasks e Describe TCP and its functions e Describe TCP synchronization and flow control e Describe UDP operation and processes e Identify common port numbers e Describe multiple conversations between hosts e Identify ports used for services and clients e Describe port numbering and well known ports e Understand the differences and the relationship between MAC addresses IP addresses and port numbers 111 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 10 Copyright 2004 Cisco Systems Inc 10 1 TCP Operation Essential Labs 10 1 6 Optional Labs None Core Tis 10 1 6 Optional Tis 10 1 1 10 1 5 and 10 1 7 Course Level Claim Students can describe the operation of the
250. ssions open at the same time The number is limited by the session limit The user can switch between these sessions with the Ctrl Shift 6 and then X key sequence To resume a Telnet session the resume command with the session id may be used The connection id of all open Telnet sessions can be viewed with the show sessions command Command Purpose Ctrl Shift 6 then X Escapes the current connection and returns to the EXEC prompt resume Makes the connection The resume session number command can be used to resume a Telnet session The process id of a session can also be entered to resume the session CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 4 Copyright 2004 Cisco Systems Inc The show sessions command output is as follows Stanly_Lab show sessions Conn Host Address Byte Idle Conn Name 1 lab b 192 168 10 1 4 5 lab b 2 lab d 192 168 10 1 0 0 lab d 3 lab e 192 168 10 1 0 0 lab e 4 2 5 Alternative connectivity tests 47 238 Connectivity can be tested with several other commands such as ping traceroute and show ip route The ping command uses ICMP to send an echo request to a destination and then awaits an echo reply from that destination This is a good test for basic connectivity reliability and delay This test can be performed from the user or privileged EXEC mode A successful ping is indicated by exclamation points A period indic
251. stability and routing packets Frame Relay c7 NEW PVCs SVCs Traffic Shaping dial backup PPP over Frame Relay configuration performance and connectivity issues IP Routing Protocols c7 NEW Common issues on configuration routes missing from routing table route not being redistributed network not being advertised neighbor not forming or flapping Internet and network connectivity NAT PBR HSRP and error messages Routing protocols covered include EIGRP OSPF BGP and RIP LAN Switching c7 NEW Configuration connectivity VLANs trunking autonegotiation passwords and catalyst hardware issues Hardware Troubleshooting Catalyst switches 2900XL 3500XL 2948G L3 4908G L3 4000 4912G 2980G 2948G 5000 5500 2926G 2926 6000 6500 MSFC MSFC2 access servers AS5200 5300 AS5350 5400 AS5800 and MC3810 Access Concentrator Router and 10S Architecture c7 NEW Router crashes upgrades installation password recovery error messages memory hardware and booting problems for Cisco routers 800 1600 2500 2600 3600 3700 4000 4500 4700 7200 UBR 7200 amp 7500 modules 7500 RSP VIP FEIP amp GEIP and access servers AS5200 AS5300 amp AS53800 Security c7 NEW Connectivity hardware software features and upgrades licensing password recovery for the PIX and VPN 3000 Concentrator and VPN client installation The TAC Case Collection is an evolution of the Troubleshooting Assistant tool It allows users to interactiv
252. stems Inc Studies have found that relatively short engaging lectures that include demonstrations are excellent adjuncts to the online curriculum and lab activities 206 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Appendix B Copyright 2004 Cisco Systems Inc B 4 2 Self paced instruction Academy courses implement self paced instruction and learning strategies In self paced instruction students learn new content at a speed of comprehension that best fits their learning style The content is presented in modules which are chunks of information that fit together into a comprehensive whole Modules are effective because they allow students to acquire new knowledge in manageable pieces This method of teaching and learning is used in online environments Self paced instruction in an online environment allows students to journey through new competencies or knowledge with flexible time and space requirements The purpose of online learning should be stated early in the course so students understand what objectives and performances they will be required to master during a course experience As they begin their voyage into new content students will encounter linked resources through the Internet and other electronic connections Through exploration and experimentation online learning will allow students to become actively involved with the content Curiosity and inquiry will drive student interest Self paced instruction wil
253. structor picks a number between decimal 0 and 255 and each student must decide if they should sit to represent binary 0 or stand to represent binary 1 Many IT processes and algorithms can be expressed through kinesthetic activities Role playing occurs when students act out or dramatize a scenario story event or real life situation Role playing activities can be used to help students understand events discoveries or interpersonal relationships Students can create a script for role playing or ad lib the actions and dialogue Web Links Kinesthetic Teaching http Awww mindsinmotion org creative html 225 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Appendix B Copyright 2004 Cisco Systems Inc B 5 Assessment Strategies B 5 1 Review strategies Most lessons contain review questions that pertain to content from the previous lesson Strategies for the use of review questions can be selected from the following list Web Links Individual students answer review questions on their computers Pairs of students discuss and answer review questions on their computers Pairs or small groups of students discuss and answer review questions before each student completes the review The entire class or groups of students discuss review questions and enhance their levels of comprehension through the discussion Small groups each discuss a portion of the questions and explain their findings to other groups to demons
254. sts list 101 1 Instructor Guide Case Study line protocol is down 7 matches 72 matches Copyright 2004 Cisco Systems Inc deny tcp 172 16 96 0 0 0 31 255 any eq telnet deny icmp 172 16 96 0 0 0 31 255 any 8 matches Boaz 145 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Case Study Copyright 2004 Cisco Systems Inc Phase 5 Documenting the Network Sample outputs Centre 2500 Configuration Management documentation Centre show cdp neighbors Capability Codes R Router T Trans Bridge B Source Route Bridge S Switch H Host I IGMP Device ID Local Intrfce Holdtme Capability Platform Port ID Boaz Ser 0 153 R 2500 Ser 0 Eva Ser 1 140 R 2500 Ser 1 Centre show ip route Codes C connected S static I IGRP R RIP M mobile B BGP D EIGRP EX EIGRP external O OSPF IA OSPF inter area El OSPF external type 1 E2 OSPF external type 2 E EGP i IS IS Ll IS IS level 1 L2 IS IS level 2 candidate default U per user static route Gateway of last resort is not set 172 16 0 0 16 is subnetted 4 subnets G 172 16 128 0 is directly connected Seriall C 172 16 32 0 is directly connected Ethernet0 I 172 16 96 0 100 8576 via 172 16 64 2 00 00 57 Serialo 172 16 64 0 is directly connected Serialo Centre show ip protocol Routing Protocol is igrp 11 Sending updates every 90 seconds next
255. students interested in learning about Make sure students understand this material so that static and dynamic routing can be compared in future lessons Students who complete this module should be able to perform the following tasks e Explain the significance of static routing e Configure static and default routes e Verify and troubleshoot static and default routes e Identify the classes of routing protocols e Identify distance vector routing protocols e Identify link state routing protocols e Describe the basic characteristics of common routing protocols e Identify interior gateway protocols e Identify exterior gateway protocols e Enable Routing Information Protocol RIP on a router 62 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 6 Copyright 2004 Cisco Systems Inc 6 1 Introduction to Static Routing Essential Labs 6 1 6 Optional Labs None Core Tis All Optional Tis none Course Level Claim Students can identify configure and verify the use of static and default routes Certification Level Claim Students can evaluate the characteristics of routing protocols Hands on skills none 6 1 1 Introduction to routing Routing is the process that a router uses to forward packets toward the destination network The routing process is based on the destination IP address of a packet When routers use dynamic routing the routing information is learned from other routers When static routing is
256. students to complete a network design implementation and troubleshooting project using the skills gained in CCNA 2 Students will use the skills that have already been developed to use make and connect the proper cabling to the appropriate devices It is crucial to read and understand the scenarios to make sure that all requirements are fulfilled Each scenario guides the student through the proper steps to ensure that the project is completed properly This case study requires the student to accomplish the following tasks e Setup the physical layout of the network using the diagram and accompanying narrative e Correctly configure the routers with a basic router configuration e Setup a TFTP server on one of the workstations e Create and apply access control lists on the appropriate router s and interface s e Troubleshoot and test all connectivity and access control lists e Provide detailed documentation in a prescribed form as listed in the deliverables section 130 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Case Study Copyright 2004 Cisco Systems Inc Scenario and Phase 1 Project Description A company has several people responsible for maintaining various sections of the internetwork infrastructure Many technicians have done an excellent job with the small portion for which they are responsible One of the other network associates who was responsible for a larger portion of the infrastructure su
257. t e The subnet network of the source IP address is the same subnet network of the next hop IP address of the routed packet e The datagram is not source routed CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 8 Copyright 2004 Cisco Systems Inc e The route for the redirect is not another ICMP redirect or a default route e The router is configured to send redirects Make sure students understand default gateways Instruct students to look at the router lab setup and visually determine the default gateway of the host attached to it 8 2 3 Clock synchronization and transit time estimation Networks that connect to each other over vast distances choose their own method of clock synchronization As a result hosts on disparate networks who attempt to communicate with software that requires time synchronization can encounter problems The ICMP timestamp message type is designed to help alleviate this problem The ICMP timestamp request message allows a host to ask the remote host for the current time The remote host uses an ICMP timestamp reply message to respond to the request The type field on an ICMP timestamp message can be either a 13 or 14 timestamp reply The code field value is always set to zero The ICMP timestamp request contains an originate timestamp which is the time on the requesting host just before the timestamp request is sent The receive timestamp is the time that the destination host receives the I
258. t 2004 Cisco Systems Inc lll Teaching Guide for Each TI Nomenclature The CCNA curriculum uses the following hierarchy Course Module Learning objective LO Target indicator TI For example 3 2 5 references Module 3 LO 2 and TI 5 The following terms are commonly used to describe the curriculum instructional materials and assessments in WWE and Cisco documentation Certification level claims High level statements about what a CCNA certified person should know and be able to do These claims are measured through certification exams Course A subset of a curriculum which is a collection of chapters to be offered as a scheduled course Course level claims Medium level statements about what a person who completes the CCNA 2 course should know and be able to do Core TI The Tls that apply most directly to the claims and learning objectives Instructors should not skip over these Tis or move through them quickly Curriculum A predefined or dynamic path of learning events with an end goal such as certification or the acquisition of required job skills and knowledge Hands on skills There is some overlap between hands on skills and claims These statements emphasize hands on lab based learning 8 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Teaching Guide TI by TI Copyright 2004 Cisco Systems Inc e Module Logical groupings that comprise a course Modules contain multipl
259. t If only Layer 2 addressing is used then the data can only be delivered locally If a router cannot find a Layer 3 address after the frame is discarded it will not know what to do with the packet e Could there be multiple sessions between the same hosts without port numbers No Port numbers distinguish the various conversations between hosts Without port numbers there would be no way for the hosts to determine to which session a packet belongs e What is an option if there is no Layer 2 address Broadcast all the frames Generally this is not an acceptable solution When a frame is broadcast every host in the network segment will examine the packet to see if it is addressed to that host This forces the host to use an interrupt to notify the CPU The host must stop what it is doing and service this interrupt This type of broadcast communication is an inefficient use of bandwidth and also wastes valuable CPU resources on the hosts 117 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 10 Copyright 2004 Cisco Systems Inc Module 10 Summary Before students begin Module 11 they must be able to compare and contrast the roles of MAC addresses IP addresses and port numbers Online assessment options include the end of module online quiz in the curriculum and the online Module 10 exam Students should understand the following main points e TCP operation description e Synchronization process or three way han
260. t Eva 172 16 128 2 172 16 160 1 no ip classless access list 101 permit ip 172 16 96 access list 101 permit ip 172 16 96 0 0 31 255 access list 101 deny tcp 172 16 96 0 0 0 31 255 any eq telnet access list 101 deny icmp 172 16 96 0 0 0 31 255 any banner motd CWarning This is a SECURE SYSTEM UNAUTHORIZED USERS will be prosecuted C 1 255 host 172 16 32 5 0 0 0 31 0 0 0 31 255 172 16 96 0 line con 0 exec timeout 0 0 password cisco login line aux 0 line vty 0 4 password cisco login end Boaz 143 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Case Study Copyright 2004 Cisco Systems Inc Security Management documentation Boaz 2500 Boaz show ip interface EthernetO is up li Internet address i Broadcast address ne protocol is up s 172 16 96 1 19 iS 299429942994209 Address determined by setup command MTU is 1500 bytes Helper address is Directed broadcast Outgoing access li Inbound access lis Proxy ARP is enabl Security level is Split horizon is e ICMP redirects are ICMP unreachables ICMP mask replies not set forwarding is enabled st is not set t is 101 ed default nabled always sent are always sent are never sent IP fast switching IP fast switching IP multicast fast Router Discovery i IP output packet a IP access violatio TCP IP header comp Probe proxy name r is enabled on the same int
261. t is used Remind students that vty lines 0 through 4 can be configured in a router configuration Since Telnet is a vty connection a router will support simultaneous Telnet connections Telnet also provides a tool for troubleshooting The establishment of a Telnet connection confirms the connectivity and functionality of the application layer The ping command only confirms Layer 3 connectivity 4 2 2 Establishing and verifying a Telnet connection 45 238 From the router console Telnet can be used to connect to remote devices The administrator must type in the name of a router or the IP address of an interface to establish a Telnet connection The following commands can be used Router gt 131 108 100 152 Router gt paris Router gt connect paris Router gt telnet paris The figure includes an explanation of Telnet The example shows how to console into a directly connected router and then establish a Telnet connection with other network devices Telnet may also be used to connect a PC to the router or other network device through a network connection instead of using a direct console cable for the connection Students may not understand that Telnet is widely implemented It is not used only within a network device to connect to other network devices For example Telnet can be used from the command prompt in Microsoft Windows It can be used to connect to other PCs servers or devices Demonstrate various telnet connection comm
262. tasks Name a router Set passwords Examine show commands Configure a serial interface Configure an Ethernet interface Make changes to a router Save changes to a router 26 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 3 Copyright 2004 Cisco Systems Inc e Configure an interface description e Configure a message of the day banner e Configure host tables e Understand the importance of backups and documentation 27 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 3 Copyright 2004 Cisco Systems Inc 3 1 Configure a Router Essential Labs 3 1 2 3 1 3 3 1 4 3 1 5 3 1 6 and 3 1 7 Optional Labs None Core Tis All Optional Tis none Course Level Claim Students can perform save and test an initial configuration on a router Certification Level Claim Students can perform an initial configuration on a router Hands on skills none 3 1 1 CLI command modes 28 238 The students need to understand that the router does not know what routing to do until it is configured This section will help students begin the configuration of a router To gain access to a router a login is required After login there is a choice of modes The modes interpret the commands that are typed and perform the operations There are two EXEC modes e User EXEC mode e Privileged EXEC mode The first configuration mode is referred to as global configuration mode or global config T
263. te to up 00 20 47 SLINEPROTO 5 UPDOWN Line protocol on Interface Serial0 0 changed state to up rtl config if 32 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 3 Copyright 2004 Cisco Systems Inc 3 2 Finishing the Configuration Essential Labs 3 2 3 3 2 5 3 2 7 and 3 2 9 Optional Labs None Core Tis All Optional Tis none Course Level Claim Students can configure additional administrative functionality on a router Certification Level Claim Students can configure a router for additional administrative functionality Hands on skills none 3 2 1 Importance of configuration standards 33 238 This section introduces the importance of configuration standards The following topics are covered e Configuration of interface descriptions e Message of the day banners e Configuration of host tables e Backup configuration documentation In many organizations standards are either treated very seriously or there are no standards It is important to develop standards for configuration files within an organization These can be used to control of the number of configuration files that must be maintained how the files are stored and where the files are stored In organizations where standards are treated seriously students need to understand that it is very important for the standards to be followed In organizations where there are no standards students can introdu
264. ted It is important to check the interface IP address and subnet configuration A common problem is to assign the wrong IP address or subnet mask The network command is required because it enables the routing process to determine which interfaces will send and receive routing updates A network statement must be entered for all connected networks Two common problems are failure to enable the routing protocol or failure to enter all the connected networks 6 3 3 Routing protocols Examples of IP routing protocols include the following e RIP a distance vector interior routing protocol e IGRP a Cisco distance vector interior routing protocol e OSPF alink state interior routing protocol e EIGRP a balanced hybrid distance vector interior routing protocol e BGP an exterior routing protocol Make sure students understand that each routing protocol has advantages and disadvantages The protocols have different characteristics and were designed for different purposes In some instances administrators will want to use RIP and other times they will use BGP 72 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 6 Copyright 2004 Cisco Systems Inc 6 3 4 IGP versus EGP Interior routing protocols are designed to be used in a network that is under the control of a single organization The protocols used in CCNA 2 will be IGPs The protocols RIP IGRP EIGRP and OSPF are all IGPs Exterior routing protocols are des
265. ters and Routing Basics v3 1 Instructor Guide Module 4 Copyright 2004 Cisco Systems Inc Module 5 Managing Cisco IOS Software Overview When teaching Module 5 emphasize the importance of the router boot sequence The router boot sequence verifies the proper operation of the router hardware identifies the correct IOS and configuration file and shows the location of each This process must be understood to properly configure and operate all Cisco routers Before students begin Module 5 they should be able to identify the purpose and operation of the IOS use the show version command and troubleshoot basic connectivity issues In this section students will learn about the Cisco IOS File System and how to use a variety of Cisco IOS software source options Students will also learn how to use commands to load Cisco IOS software onto a router maintain backup files and upgrade Cisco IOS software Module Caution Make sure students fully understand how to copy and paste configurations into a router Make sure that they understand the importance of configuration management especially backups Students who complete this module should be able to perform the following tasks e Identify the stages of the router boot sequence e Describe how a Cisco device locates and loads the Cisco IOS e Usethe boot system command e Identify the configuration register values e Describe the files used by the Cisco IOS and their functions e List the locatio
266. the router The checklist below will help keep track of the configuration process Boaz Center Eva Hostname Console Password Secret Password VTY Password Serial 0 0 IP address Serial 0 1 IP address Serial 0 0 Clock Rate Serial 0 1 Clock Rate Fa 0 0 IP address Fa 0 1 IP address Enable the interfaces Add Routing Protocol Add Network Statements Note As needed Table continued on next page 133 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Case Study Copyright 2004 Cisco Systems Inc Boaz Center Eva Host Table contains all routers and servers Message of the Day Serial 0 0 description Serial 0 1 description Fa 0 0 description Fa 0 1 description Instructor approval Date 134 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Case Study Copyright 2004 Cisco Systems Inc Phase 4 Access Control Lists While testing the network the team leader discovers that security has not been planned for the network If the network configuration were installed as designed any network user would be able to access all network devices and workstations The team leader asks the technician to add access control lists ACLs to the routers The team leader has some suggestions for developing the security Before the ACLs are added backup the
267. the topology This view is called convergence When all routers in an internetwork use the same knowledge the internetwork is said to have converged This means all the routers have agreed on the reachable networks The purpose of autonomous systems is to segregate the entire network into administrations If all the routers needed to communicate with all other routers on the Internet each router would have a tremendous number of routes and would use large amounts of bandwidth to share the routes with the other routers This is referred to as overhead for the routers More overhead will increase hardware requirements When a network is divided into autonomous systems only the routers inside the local AS receive details about the routing information Routers in other autonomous systems only need a summary of the routing information This reduces the number of routes and the amount of routing information that has to be shared which reduces router overhead It also improves network stability since routing updates that are caused by topology changes do not have to be shared outside of the local AS Some routing protocols can be used divide an AS into smaller units to provide the same benefits 6 2 4 Identifying the classes of routing protocols Most routing algorithms can be classified as one of three basic algorithms e Distance vector e Link state e Balanced hybrid Routers will determine which route to take to a given network based on the type of a
268. tion about what the interface addresses should be The interface description should provide information about the configuration connection and use of the interface 3 2 2 Interface descriptions The description of an interface should be used to identify important information such as a distant router a circuit number or a specific network segment A description of an interface can help a network user remember specific information about the interface such as which network the interface services The description is a comment about the interface Stress the importance of a standard type of description Students will use small routers in a small topology and can get physical access to the routers Since this is the extent of their experience it is hard for them to understand how helpful interface descriptions are Ask the students to envision an environment with hundreds of routers thousands of interfaces and routers that are 1000 kilometers 621 4 miles away Tell the students that a customer from a branch office is unable to connect to headquarters Ask students how they can verify that the interface is connected to the correct branch office before they change anything on the interface There are several good answers such as ask the customer refer to documentation and use the show cdp neighbor command The best answer is to look at the interface description with the show interface command Ask students the following questions e What is use
269. tion addresses protocols and upper layer port numbers ACLs are created on a per protocol per direction and per port basis ACLs control traffic in one direction on an interface Therefore for every protocol it is possible that two ACLs could be created an inbound and an outbound The following are some of the primary reasons to create ACLs e Limit network traffic and increase network performance e Provide traffic flow control e Provide a basic level of security for network access e Decide which types of traffic are forwarded or blocked at the router interfaces e Allow an administrator to control what areas a client can access on a network e Screen certain hosts to either allow or deny access to part of a network e Grant or deny user permission to access only certain types of files such as FTP or HTTP The labs in CCNA 2 have allowed all traffic with no filtering The students must understand the path or know the source and destination address of the packets to apply the concept of an ACL Review the OSI model and the protocols at each layer with the students The reasons for ACLs and the methods that ACLs use to accomplish these functions may not be apparent to the students ACLs may require some time to grasp Do not rush through these sections Give the students enough time to absorb this information Encourage the students to use the labs to reinforce this knowledge Encourage the students to experiment with various ACL scenarios 11
270. to students in other countries The curriculum focuses on trends in math and science achievement The study completed in 1995 discovers that fourth grade students in the United States scored above the international average Eighth graders in the United States scored above the international level in science but below the international level in mathematics Twelfth graders in the United States scored at the lowest possible levels in both math and science Two findings emerged when different types of knowledge presentation were compared internationally First the United States leads the world in the amount of math and science objectives that are covered within curriculum However U S students are not taught how to use the information that they are learning Asian nations and European nations teach fewer objectives and give students more opportunities to use the knowledge in practical applications This study also finds dissimilarities in teaching styles In the United States problem solving usually occurs after the teacher has demonstrated the process to find the correct answer based upon mathematical principals Students will then apply this problem solving process to similar mathematical problems In countries such as Japan the order of methodology is reversed Problem solving comes first in the sequence of learning Students are presented with a problem and try to solve the problem based on their current knowledge They invent their own solutions and t
271. to the serial interface and to see the clock rate on the interface with the DCE cable 9 3 7 Introduction to debug The debug command is used to display dynamic data and events The debug command output gives more insight into the current events of the router The dynamic output of the debug command has a high performance cost It produces a high processor overhead that disrupts normal router operation Debug should be used conservatively Stress to the students that debug is a very important tool However this command can disrupt router operations and cause network performance to decrease drastically It should only be used to diagnose a problem and then it should be turned off 109 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 9 Copyright 2004 Cisco Systems Inc Module 9 Summary Before students begin Module 10 they must be able to read and interpret a routing table and must have mastered a range of IOS commands for troubleshooting Online assessment options include the end of module online quiz in the curriculum and the online Module 9 exam Paper activities and hands on router challenges should be used to give students troubleshooting practice Consider giving students previously bugged configuration files so they can demonstrate their troubleshooting skills in a timed controlled setting Students should understand the following main points Use and understand the output of the show ip route command Det
272. tor Guide Appendix B Copyright 2004 Cisco Systems Inc SCAMPER involves a series of questions related to a new process or concept After students encounter new information they respond to the following questions e Substitute What material methods processes or situations can be used in place of this e Combine What materials methods processes or situations can be combined or added to influence this issue or problem e Adapt Can the materials methods processes or situations be used in another way to find a solution e Modify Can this be made bigger stronger and more frequent Can it be made smaller and more compact e Put to other uses Can this be used instead of other materials methods processes or situations e Eliminate Can parts of this be eliminated e Reverse Can the work be done backwards Can this process be reversed SCAMPER emphasizes that no response is too crazy or inconceivable Web Links Gifted Education A Resource Guide for Teachers http Awww bced gov bc ca specialed gifted process htm Scamper http www discover tased edu au english scamper htm 201 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Appendix B Copyright 2004 Cisco Systems Inc B 3 4 Case studies 192 168 200 0 24 192 168 208 0 20 192 168 224 0 20 192 168 240 0 20 192 168 200 0 24 192 168 208 0 20 192 168 224 0 20 192 168 240 0 20 Capetown x J 192 168 32
273. tors can demonstrate time management skills in the classroom and monitor student goal setting behaviors Instructors should set aside time for students to determine their progress This can be done through reflection and journal writing activities Instructors also demonstrate risk taking behaviors in the classroom They encourage their students to try new strategies if they believe a strategy may help them reach their goals 223 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Appendix B Copyright 2004 Cisco Systems Inc B 4 9 Kinesthetic activities 59 stttatt 128 64 32 16 8 4 2 41 Figure 1 Kinesthetic Activities 59 aatttatt 00111011 Figure 2 Kinesthetic Activities 224 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Appendix B Copyright 2004 Cisco Systems Inc A kinesthetic activity refers to the movement of the body to act out or communicate something The kinesthetic activities in this section demonstrate the networking process These exercises are also known as role playing activities or skits They help students understand complex and normally invisible processes Kinesthetic activities can be a helpful way to introduce basic IT concepts Most IT courses require knowledge of binary arithmetic Figures LU and 2 show an activity that can be done with eight students Each student represents a specific place value of 128 64 32 16 8 4 2 or 1 for 8 bit binary numbers The in
274. trate their knowledge This is an example of the jigsaw technique The entire class plays a game in which one person states a fact which represents the correct answer to a question and leaves out an important piece of information The rest of the class must respond with the missing information in the form of a question For example the fact could be This is the first layer of the OSI and the correct response would be What is the physical layer Points can be awarded for correct responses based on the level of difficulty Student teams or small groups design analogies to explain concepts to other teams of students Learning Through Technology http Awww wcer wisc edu nise cl1 ilt default asp 226 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Appendix B Copyright 2004 Cisco Systems Inc B 5 2 Journals and reflection An effective evaluation practice for students is to write in journals and reflect on academic experiences Students can document their individual learning process and highlight important concepts A learning log asks students to document their learning steps and indicate what is clear what confuses them and what they would like to learn more about This provides important information about how students interact with and process new content Instructors can determine if students are satisfied with their program and motivated to continue Journals are self reflective and encourage students to
275. tructor Guide Module 6 Copyright 2004 Cisco Systems Inc 6 1 3 Configuring static routes Use the following steps to configure static routes 1 Determine all desired destination networks their subnet masks and their gateways A gateway can be either a local interface or a next hop address that leads to the desired destination Enter global configuration mode Type the ip route command with the address and subnet mask of the destination followed by their corresponding gateway from Step 1 An administrative distance is optional Repeat Step 3 for as many destination networks as were defined in Step 1 Exit global configuration mode Save the active configuration to NVRAM by using the copy running config startup config command 192 168 1 0 24 192 168 0 0 24 192 168 2 0 24 So 0 192 168 1 2 192 168 1 1 Here is an example of a route from Rt1 to network 192 168 2 0 Rtl config terminal Enter configuration commands one per line End with CNTL Z Rt1 config ip route 192 168 2 0 255 255 255 0 192 168 1 2 Rt1 config exit Rtl Rtl copy running config startup config Destination filename startup config Building configuration Rtl All routers must be configured If Rt2 does not have a route back to network 192 168 0 0 a ping from network 192 168 0 0 will make it to network 192 168 2 0 but will not know how to get back A relevant TI from CCNA 2 v2 1 4 is 12 1 4 65 238 CCNA 2
276. truders to beware A login banner is a message that is displayed at login and can be used to convey messages that affect all network users such as system shutdowns Make sure students understand that these banners should be warnings and not invitations Ask students the following questions e Who can see a login banner e What is an example of a good login banner e Where is the login banner displayed 3 2 5 Configuring message of the day MOTD A message of the day MOTD banner can be displayed on all connected terminals Students must enter global configuration mode to configure a message of the day banner They should use the banner motd command followed by a space and a delimiting character such as the pound sign Next students should add a message of the day followed by a space and the delimiting character again Instruct students to follow these steps to display a message of the day 1 Enter global configuration mode with the configure terminal command 2 Enterthe banner motd message of the day command 3 Save changes with the copy running config startup config Or copy run start command 3 2 6 Host name resolutions 35 238 Protocols such as Telnet use host names to identify network devices or hosts Network devices such as routers must be able to associate host names with IP addresses to communicate with other IP devices Each unique IP address can have a host name associated with it The Cisco IOS software mai
277. ts of the diagram have been established research indicates that students are successful in their learning This model represents a constructivist learning approach Constructivist learning is derived from the Latin word constructus which means to build The Cisco Networking Academy allows students to develop knowledge that they can use in the real world Constructivist learning is also known as student centered learning This type of learning is recognized as an exemplary instructional model This method of teaching puts the students in control of their own learning It allows them to practice their experimentation inquiry problem solving decision making and communication skills Constructivist learning can occur on an individual level in grouped pairs of students or in small cooperative groups of three or four students During constructivist activities an essential question is presented to individuals or groups of students for thoughts and discussion Students in a group setting will search for information about issues that surface during their discussion 172 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Appendix B Copyright 2004 Cisco Systems Inc Students will also assign roles and identify jobs that need to be completed for the benefit of the group This allows students to tap into their current knowledge and journey into new levels of comprehension through a continuous cycle of inquiry and exploration Stu
278. ts they want Personal goals give students a map for their success It is important to create a design or an intended course of action Students should list the small steps and the larger milestones and use visual reminders Students demonstrate their dedication to reach their final goals through progress The achievement of a goal is only possible if students are willing to make decisions and modify their behavior along the way Students must dedicate their strengths and resources to the goal in spite of any diversions disappointments or difficulties they encounter To successfully reach their goals students need to make connections with other people They should seek out people with the knowledge to advance their comprehension and the passion to keep them motivated and encouraged It is a fundamental psychological principal that learning requires the assimilation of new comprehension into a current level of comprehension Students can be shown how to tap into their personal experiences and knowledge to find solutions to their problems Finally there must be an evaluation process Students should measure their accomplishments at each level of their action plan Students will continuously put additional procedures in place to help them reach the next step toward their goals Instructors who advocate the practice of goal setting in their courses should provide opportunities to discuss goal setting skills as they pertain to personal goals These instruc
279. tudents can analyze configure implement verify and rectify access control lists within a router configuration Certification Level Claim Students can implement access lists develop an access list to meet user specifications troubleshoot an access list and evaluate rules for packet control Hands on skills none 11 2 1 Standard ACLs Standard ACLs check the source address of IP packets that are routed The comparison will result in either permit or deny access for an entire protocol suite based on the network subnet and host addresses The standard version of the access list global configuration command is used to define an IP standard ACL with a number in the range of 1 to 99 The full syntax of the standard ACL command is as follows Router config access list access list number deny permit source address source wildcard log The no form of this command is used to remove a standard ACL Router config no access list access list number A standard ACL only filters on the source address The source can be a single host or an entire network This is the major difference between a standard and extended ACL Have the students discuss the ACL before they begin the labs Draw a network and tell the students to create a standard ACL to block a host or a network Show students the path the packet will take from the source to the destination At each router interface ask the students if the packet is going in or out of t
280. uch as command line interfaces CLIs graphical user interfaces GUIs and programming language development environments Figure 1 shows a simulation activity from the UNIX curriculum The Help feature in the simulation can be used to obtain the necessary information to complete the required task There are generally three levels of Academy simulations e Syntax drill The simplest and most scripted activity can be thought of as a syntax drill This exercise gives students immediate practice when a new command or procedure is introduced These simulations help move online curriculum away from an e reading approach to a more interactive e learning approach e Lab drill The second level can be thought of as a lab drill This exercise involves a step by step simulation of hands on labs and configuration tasks The hands on lab or configuration task will include a complete flash analogue that can be done by students even if they have no access to the lab equipment 186 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Appendix B Copyright 2004 Cisco Systems Inc e Simulation The third level is called simulation This is the most open ended environment This level is not scripted Therefore it supports a wide variety of hardware and software behavior For command line interfaces such as IOS or UNIX many commands can be issued in any order The best example of this third level simulation environment is eSIM whic
281. udents provided technical support for the annual Ohio SchoolNet Technology Conference Academy students helped set up the network for the conference and provided technical assistance to conference managers and presenters One quote from a student demonstrates the value of this learning experience This really helped me see the big picture of how everything works together and what tech support is like Another example of community outreach takes place in Washington D C where Cisco Systems partners with Mary s Center for Maternal and Child Care With help from a volunteer system engineer and three students from the Cisco Networking Academy Program at Bell Multicultural High School Mary s Center now has a fully operational wireless network that can support their computer needs Now the center can access important health and insurance information needed to assist families and their children Academy students receive many benefits from working on real world projects These benefits are described in a quote from Max Anis a Networking Academy instructor at Bell High School These students return to the classroom with an incredible amount of energy after these experiences As a result they are even more determined to complete the program and continue their pursuit of a career in the industry 197 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Appendix B Copyright 2004 Cisco Systems Inc B 3 2 Design activities Solution
282. udents record their thoughts on the right side of the chart as they apply the categories to the new content Students can work individually on PMI charts and then share their responses with a partner or a larger group Ideas and perspectives are shared until they reach common conclusions PMI is especially useful during lecture sessions since it provides students with an opportunity and a method to digest new content Web Links PMI http www mindtools com pmi html Activating and Engaging Habits of Mind http Avww ascd org cms objectlib ascdframeset index cfm publication http www ascd org pu blications books 2000costa1 2000costatoc html 214 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Appendix B Copyright 2004 Cisco Systems Inc B 4 7 Graphic organizers Examples of Networks Figure 1 Cluster Diagram s F we amp Alternatives iy CO CO CO gt Figure 2 Problem Solving Matrix 215 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Appendix B Copyright 2004 Cisco Systems Inc Figure 3 Flowchart Figure 4 Block Diagrams 216 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Appendix B Copyright 2004 Cisco Systems Inc Internet gt Figure 6 Main Building First Floor 217 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Appendix B Copyright 2004 Cisco Systems Inc gt 6 5
283. ues related to data and voice connections and discusses the industry and worldwide standards types of media and cabling physical and logical networks and signal transmission Students will develop skills in the following areas e How to read network design documentation e Part list set up and purchase e How to pull and mount cable e Cable management e How to choose wiring closets e Patch panel installation e Termination e Jack installation and cable testing This is a hands on lab oriented 70 hour course It stresses the following competencies e Documentation e Design e Installation issues 189 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Appendix B Copyright 2004 Cisco Systems Inc e Laboratory safety e On the job safety e Working effectively in group environments Fundamentals of UNIX Fundamentals of UNIX which is sponsored by Sun Microsystems provides students with the following e Ability to use UNIX operating system commands e Hands on experience with basic Sun Microsystems SolarisTM operating environment commands e Introduction to the Common Desktop Environment CDE which is the graphical interface between different environments This class is intended for new users of UNIX Students will learn the fundamental command line features of the Solaris environment e File system navigation e File permissions e The vi text editor e Command shells e Basic network use CDE featur
284. uickly through these labs If students are uncomfortable with the CLI they will have difficulties with more complex labs Students who complete this module should be able to perform the following tasks Describe the purpose of the IOS Describe the basic operation of the IOS Identify various IOS features Identify the methods to establish a command line interface CLI session with the router Move between the user command executive EXEC and privileged EXEC modes Establish a HyperTerminal session on a router Log into a router Use the help feature in the command line interface Troubleshoot command errors 18 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 2 Copyright 2004 Cisco Systems Inc 2 1 Operating Cisco IOS Software Essential Labs None Optional Labs None Core Tis All Optional Tis none Course Level Claim Students can describe the purpose and fundamental operation of the router IOS Certification Level Claim Students can establish communication between a terminal device and the router IOS and use it for system analysis configuration and repairs Hands on skills none 2 1 1 The purpose of Cisco IOS software In this TI students will be introduced to the fundamentals of the Cisco Internet Operating System IOS Student will learn about the show version command which helps users gain information about the Cisco IOS The IOS command line interface is introduced in another lesson s
285. ures in your Cisco IOS releases or platforms Search by Release lmage Name Product Code Platform C Compare Releases Quickly Compare between two Cisco IOS releases india Compare Images RELEASE 12 3T Learn About Release 12 3 Easy Access to Voice Security and QoS Feature Navigator NOW supports all the major Cisco IOS releases By using this tool you agree to all of Cisco System s terms and conditions for this tool Cisco Feature Navigator Il is a Web based application that allows users to quickly find the right Cisco IOS Software release for the features they want to run on their networks Users can search by feature search by release or compare two different releases http tools cisco com ITDIT CFN jsp index jsp 165 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Appendix A Copyright 2004 Cisco Systems Inc 9 TAC Advanced Search Cisco SYSTEMS TECHNICAL SUPPORT TOOLS amp UTILITIES TAC Advanced Search Manage your TAC Cases Open a case Query a case Technical Support fso Register Contacts amp Feedback Help Site Map Select a Location Language Search Search All Cisco com New The Cisco com search can perform many of the same functions as the TAC Advanced Search More info Toolkit Roll m E Look in TAC Technical Documentation TAC Data Collections all of www cisco com NetPro search Eeedback Help Service Contract Cent
286. used between routers A routing protocol allows one router to share information with other routers such as known networks and how close they are to the router The information a router gets from another router through the routing protocol is used to build and maintain a routing table A routed protocol is used to direct user traffic A routed protocol is a network protocol that provides enough information in its network layer address to allow a packet to be forwarded from one host to another host based on the addressing scheme The Internet Protocol IP is an example of a routed protocol Students should know the difference between a routed and routing protocol at the end of this TI Identify the location of each protocol in the OSI model Ask students the following questions e TCP is at which layer e IP is at which layer e ls the protocol connection oriented or connectionless e RIP IGRP EIGRP and OSPF are at which layer and what is the administrative distance of each 6 2 2 Autonomous systems 69 238 An autonomous system is a collection of networks under a common administration that share a common routing strategy Some routing protocols use an autonomous system to communicate routing information The routers are configured with the routing protocol and the autonomous system number Each router can only communicate with other routers within the same autonomous system To demonstrate this concept divide the classroom into groups a
287. ute in its table To do this it sets the hop count to Network X to one more than the maximum It then sends a poison update to Router B regardless of the time schedule for routing updates This does not send the entire table It only sends the route poisoning This single change which indicates that Network X is now unreachable is quickly propagated through the network This speeds convergence and reduces the likelihood that a loop will develop 7 1 6 Avoiding routing loops with triggered updates Routing table updates are automatically sent out at specific time intervals by distance vector routing protocols As discussed earlier slow convergence can create a scenario in which routers incorrectly think a route to a network is available which results in a routing loop Triggered updates such as route poisoning help prevent these routing loops by sending out updates when topology changes occur without waiting for the update time to be reached This speeds up convergence in relationship to network topology changes Reference the graphic in this section A triggered update would occur if Network X went down Router C would detect the change update its routing table and then send out an update to Router B even though its update timer is set at 18 IP RIP would send out table updates at 30 seconds and IGRP would send them out at 90 seconds This triggered update would poison the route until the holddown timer which is discussed in the next section has
288. uters while other teams try to configure other routers in the topology Since NETLAB can save and store these configuration files it is easy for the instructor to evaluate the performance of each team NETLAB has also been used by instructors to review the work of students on real equipment During each lab reservation NETLAB records every command and router output in log files The final equipment configurations of students can be saved for instructor review This feature allows instructors to determine the ability of students to implement the concepts learned in the classroom Instructors can also identify and correct common mistakes that are made by students during lab exercises NETLAB is currently deployed as a pilot program at selected Cisco Networking Academies Upon the successful completion of this pilot program Cisco will offer NETLAB to all Cisco Networking Academies For information on how to become one of the Academies that participates in the NETLAB project pilot please e mail netlab pilot cisco com Interested Academies will receive a survey that will help identify any changes that will need to be made for the NETLAB tool to function and information on how to order the necessary equipment Please e mail netlab question cisco com with any questions or requests for additional information This process is designed to minimize potential deployment problems and to enhance the success of a production deployment Academies will be selected for
289. ve consistent knowledge and correct routing tables The network is said to have converged Assume for the remainder of this example that for Router C the preferred path to Network 1 is by way of Router B and the distance from Router C to Network 1 is three CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 7 Copyright 2004 Cisco Systems Inc e When Network 1 fails Router E sends an update to Router A Router A stops routing packets to Network 1 but Routers B C and D continue to route packets because they have not yet been informed of the failure When Router A sends out its update Routers B and D stop routing to Network 1 However Router C has not received an update Router C still tries to reach Network 1 through Router B e Now Router C sends a periodic update to Router D which indicates a path to Network 1 through Router B Router D changes its routing table to reflect this incorrect information and propagates the information to Router A Router A propagates the information to Routers B and E and the process continues Any packet that is destined for Network 1 will now loop from Router C to B to A to D and back again to C Problem Routing Loops Alternate Route Use A Network 1 Distance 4 Convergence is when all routers have the same information about the network Convergence is a by product of the routing updates that are sent out based on the routing protocol used on a router If updated information do
290. vides information on Cisco IP multicast implementation http Awww cisco com warp public 732 Tech multicast 40 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 4 Copyright 2004 Cisco Systems Inc 4 1 2 Information obtained with CDP 41 238 CDP is used to collect information about directly connected devices The types of information it collects are referred to as Type Length Values TLVs This TI includes a table that defines each TLV Certain types of information are only included as a part of CDPv2 This information is noted in the table TLV Definition Device ID TLV Identifies the device name in the form of a character string Address TLV Contains a list of network address of both receiving and transmitting devices Port ID TLV Identifies the port on which the CDP packet is sent Capabilities TLV Describes the functional capabilities of a device in the form of a device type such as a switch Version TLV Contains information about the software release version on which the device is running Platform TLV Describes the hardware platform name of the device IP Network Prefix TLV CDPv2 Contains a list of network prefixes to which the sending device can forward IP packets This information is in the form of the interface protocol and port number such as Eth 0 1 VTP Management Domain TLV Advertises the configured VTP management CDPv2 domain name string of a network and is used by network o
291. will respond with a source port number of 23 and a destination port number of 1094 10 2 4 Port numbering and well known port numbers Port numbers are represented by two bytes in the header of a TCP or UDP segment This 16 bit value can result in port numbers that range from 0 to 65535 Port numbers are divided into three different categories e Well known ports e Registered ports e Dynamic or private ports The first 1023 are well known ports Registered ports range from 1024 to 49151 Ports between 49152 and 65535 are dynamic or private ports Discuss the differences between these ports with the students Also let the students know that services can use the upper port numbers This can be done for private applications or for security An example of using a private port for security is running a Telnet server listening to port 14002 instead of the well known port 23 Since the port is not the standard port 23 the open port 14002 would have to be known or discovered by a user to successfully telnet to this host 116 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 10 Copyright 2004 Cisco Systems Inc 10 2 5 Example of multiple sessions between hosts Port numbers are used to track multiple sessions that occur between hosts The port number combined with the network address forms a socket A pair of sockets one for the source and one for the destination forms a unique connection For example a host could have
292. wns spit horizons and poison reverse updates Holddowns are used to prevent regular update messages from reinstating a route that is down This is done through the lack of regularly scheduled update messages If a router does not receive an update about a particular route it marks that route as possibly down Split horizons are designed to prevent routing loops with the rule that routing information is not sent back in the direction from which it was learned This prevents routing loops between adjacent routers Poison reverse updates are necessary to avoid larger routing loops An increase in metric may indicate a routing loop so poison reverse updates are sent to place the route with the increasing metric in holddown IGRP sends out poison reverse updates when the route metric has increased by a factor of 1 1 or more The timers associated with IGRP include update invalid hold down and flush timers The update timer indicates how often routing updates will be sent the default for IGRP is 90 seconds The invalid timer is the amount of time that IGRP will wait before it declares a route invalid The default for IGRP is 270 seconds which is 3 times the update period The hold down variable specifies the holddown period During this period the information about better routes is suppressed even though the route in holddown is marked as inaccessible and advertised as unreachable When the holddown time has expired routes advertised by other routers
293. y ACLs are set The show access lists command displays the contents of all ACLs on the router To see a specific list add the ACL name or number as an option for this command The show running config command will also reveal the access lists on a router and the interface assignment information There are three common errors that students make when they create ACLs e Use incorrect wildcard masks e Do not apply the ACL to an interface e Filter in the wrong direction on an interface 123 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 11 Copyright 2004 Cisco Systems Inc To test an ACL the students will need to know what traffic will be permitted denied and the path Have students test for connectivity apply the ACL and then check the ACL to see if it works The show running config command should be used sparsely Since lab configurations are relatively simple the problems can usually be found rapidly with this command However students can become too dependent on it When students troubleshoot the complex configurations of a production environment this command will not be productive The show and debug commands are the troubleshooting commands that should be used 11 2 Access Control Lists ACLs Essential Labs 11 2 1a 11 2 1b 11 2 2a 11 2 2b and 11 2 3a Optional Labs 11 2 3b 11 2 3c and 11 2 6 Core Tis 11 2 1 11 2 2 11 2 3 and 11 2 4 Optional Tis 11 2 5 and 11 2 6 Course Level Claim S
294. y troubleshooting tool This is not a good habit It is probably the quickest way to find problems in the simple configurations used in this course However that is not true in most situations Students should learn to use the show running config command to confirm suspected problems Some CLI shortcuts to show students in the future are as follows e sh int fa0 0 for show interface fastethernet 0 0 e sh run for show running configuration e sh run int fa0 0 for show running configuration fastethernet 0 0 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 3 Copyright 2004 Cisco Systems Inc Ask students the following questions e Which command will show the configuration file in NVRAM e Which command will show the configuration file in RAM 3 1 5 Configuring a serial interface A serial interface can be configured from the console or through a virtual terminal line By default Cisco routers are DTE devices but they can be configured as DCE devices To configure a serial interface follow these steps 1 Enter global configuration mode 2 Enter interface mode 3 Specify the interface address and subnet mask 4 Set the DCE clock rate Skip this step on DTE 5 Turn on the interface There are two important items in this TI The first item is that setting a clock rate is not a normal configuration item It is only done to simulate a WAN The clock is normally provided by the DCE equipment such as a CSU The curr
295. ying static route configuration After static routes are configured it is important to verify that they are present in the routing table and that routing occurs as expected The show running config command is used to view the active configuration in NVRAM to verify that the static route was entered correctly 66 238 CCNA 2 Routers and Routing Basics v3 1 Instructor Guide Module 6 Copyright 2004 Cisco Systems Inc interface Serial0 0 ip address 192 168 1 1 255 255 255 0 no ip directed broadcast no fair queue clockrate 56000 interface FastEthernet0 0 ip address 192 168 0 1 255 255 255 0 no ip directed broadcast no keepalive j ip classless ip route 192 168 2 0 255 255 255 0 Serialo The show ip route command is used to make sure that the static route is present in the routing table The output of show ip route is as follows Show ip route output Rtl show ip route Codes C connected S static I IGRP R RIP M mobile B BGP D EIGRP EX EIGRP external O OSPF IA OSPF inter area N1 OSPF NSSA external type 1 N2 OSPF NSSA external type 2 El OSPF external type 1 E2 OSPF external type 2 E EGP i IS IS LI IS IS level 1 L2 IS IS level 2 ia IS IS inter area candidate default U per user static route o ODR P periodic downloaded static route Gateway of last resort is not set C 192 16

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