Lab 1.3.3: Troubleshooting a Small Network
Contents
1. Cisco Networking Academy Lab 1 3 3 Troubleshooting a Small Network Topology Diagram Subnet A Subnet B eeeee ee Oe Fa0 0 Learning Objectives Upon completion of this lab you will be able to Verify that a paper design meets stated network requirements Cable a network according to the topology diagram Erase the startup configuration and reload a router to the default state Load the routers with supplied scripts Discover where communication is not possible Gather information about the misconfigured portion of the network along with any other errors Analyze information to determine why communication is not possible Propose solutions to network errors Implement solutions to network errors Scenario In this lab you are given a completed configuration for a small routed network The configuration contains design and configuration errors that conflict with stated requirements and prevent end to end communication You will examine the given design and identify and correct any design errors You will then cable the network configure the hosts and load configurations onto the router Finally you will troubleshoot the connectivity problems to determine where the errors are occurring and correct them All contents are Copyright 1992 2007 Cisco Systems Inc All rights reserved This document is Cisco Public Information Page 1 of 5 CCNA Exploration LAN Switching and Wireless LAN Design Lab 1 3 3 Troublesho2. Where is the most logical place to begin troubleshooting the PC1 connection problems Step 2 Examine the router to find possible configuration errors Begin by viewing the summary of status information for each interface on the router Are there any problems with the status of the interfaces All contents are Copyright 1992 2007 Cisco Systems Inc All rights reserved This document is Cisco Public Information Page 4 of 5 CCNA Exploration LAN Switching and Wireless LAN Design Lab 1 3 3 Troubleshooting a Small Network If there are problems with the status of the interfaces record any commands that are necessary to correct the configuration errors Step 3 Use the necessary commands to correct the router configuration Step 4 View a summary of the status information If any changes were made to the configuration in the previous step view the summary of the status information for the router interfaces Does the information in the interface status summary indicate any configuration errors on Router1 If the answer is yes troubleshoot the interface status of the interfaces Has connectivity been restored Step 5 Verify the logical configuration Examine the full status of Fa 0 0 and 0 1 Is the IP addresses and subnet mask information in the interface status consistent with the configuration table If there are differences between the configuration table and the router interface configuration record an
3. interface FastEthernet0 0 description connection to hostl ip address 172 16 30 1 255 255 255 0 duplex auto speed auto i interface FastEthernet0 1 description connection to switchl ip address 192 16 31 1 255 255 255 192 duplex auto speed auto I line con 0 password cisco login line vty 0 login All contents are Copyright 1992 2007 Cisco Systems Inc All rights reserved This document is Cisco Public Information Page 3 of 5 CCNA Exploration LAN Switching and Wireless LAN Design line vty 1 4 password cisco login end Task 5 Identify Connectivity Problems Lab 1 3 3 Troubleshooting a Small Network Step 1 Use the ping command to test network connectivity Use the following table to test the connectivity of each network device From To IP Address Ping Results Host1 NIC IP address 172 16 30 1 Host1 Router1 Fa0 0 172 16 30 254 Host1 Router1 Fa0 1 172 16 31 126 Host1 Host2 172 16 31 1 Host2 NIC IP address 172 16 30 1 Host2 Router1 Fa0 1 172 16 31 126 Host2 Router1 Fa0 0 172 16 30 254 Host2 Host1 172 16 30 1 Task 6 Troubleshoot Network Connections Step 1 Begin troubleshooting at the host connected to the BRANCH router From host PC1 is it possible to ping PC2 From host PC1 is it possible to ping the router fa0 1 interface From host PC1 is it possible to ping the default gateway From host PC1 is it possible to ping itself
4. e and write the corrected values below Create a configuration table similar to the one below using your corrected values Device IP address Mask Gateway Host1 172 16 30 1 255 255 255 0 172 16 30 254 Router1 Fa0 O 172 16 30 254 255 255 255 0 N A Host2 172 16 31 1 255 255 255 128 172 16 31 126 All contents are Copyright 1992 2007 Cisco Systems Inc All rights reserved This document is Cisco Public Information Page 2 of 5 CCNA Exploration LAN Switching and Wireless LAN Design Lab 1 3 3 Troubleshooting a Small Network Router1 Fa0 1_ 172 16 31 126 255 255 255 128 N A Task 2 Cable Erase and Reload the Routers Step 1 Cable the network Cable a network that is similar to the one in the topology diagram Step 2 Clear the configuration on each router Clear the configuration on the router using the erase startup config command and then reload the router Answer no if asked to save changes Task 3 Configure the Host Computers Step 1 Configure host computers Configure the static IP address subnet mask and gateway for each host computer based on the configuration table created in Task 1 After configuring each host computer display and verify the host network settings with the ipconfig all command Task 4 Load the Router with the Supplied Scripts enable config term hostname Routerl i enable secret class I no ip domain lookup i
5. oting a Small Network using the appropriate commands When all errors have been corrected each host should be able to communicate with all other configured network elements and with the other host Task 1 Examine the Logical LAN Topology The IP address block of 172 16 30 0 23 is subnetted to meet the following requirements Subnet Number of Hosts Subnet A 174 Subnet B 60 Additional requirements and specifications e The 0 subnet is used e The smallest possible number of subnets that satisfy the requirements for hosts should be used keeping the largest possible block in reserve for future use e Assign the first usable subnet to Subnet A e Host computers use the first IP address in the subnet The network router uses the last network host address Based on these requirements the following topology has been provided to you Subnet A Specification Value IP mask decimal 255 255 255 0 IP address 172 16 30 0 First IP host address 172 16 30 1 Last IP host address 172 16 30 254 Subnet B Specification Value IP mask decimal 255 255 255 128 IP address 172 16 31 0 First IP host address 172 16 31 1 Last IP host address 172 16 31 126 Examine each of the values in the tables above and verify that this topology meets all requirements and specifications Are any of the given values incorrect If yes correct the values in the table abov
6. y commands that are necessary to correct the router configuration Has connectivity been restored Why is it useful for a host to ping its own address Task 7 Clean Up Unless directed otherwise by your instructor erase the configurations and reload the switches Disconnect and store the cabling For PC hosts that are normally connected to other networks such as the school LAN or to the Internet reconnect the appropriate cabling and restore the TCP IP settings All contents are Copyright 1992 2007 Cisco Systems Inc All rights reserved This document is Cisco Public Information Page 5 of 5
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