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Chapter 18

1. Figure 18 52 The Net use commands view and make network connections Courtesy Course Technology Cengage Learning 960 CHAPTER 18 Networking Practices THE NETSTAT COMMAND The Netstat command gives statistics about network activity see Figure 18 53 and includes several parameters One of the most useful is the b parameter that displays the program making the connection When you use the b parameter an elevated command prompt is required for Vista Use the parameter to find malware that might be using your PC for communication on the network or Internet uz Eyra jep Cee Pig Figure 18 53 Results of a netstat command Courtesy Course Technology Cengage Learning To get the best information with the b parameter include a number which tells the command to continue until manually interrupted and also send the output to a text file For example to collect information every five seconds and log output to the C netstatlog txt file use this command netstat b 5 gt gt C netstatlog txt To stop the netstat command press Ctrl Break and then check the C netstatlog txt file for suspicious activity The use of the command can also help when trying to find programs that are not malware but are simply using up networking resources see Figure 18 54 REMOTE DESKTOP Remote Desktop gives a user access to his or her Windows desktop from anywhere on the Internet As a software developer I find Remote Desktop extremel
2. To know if a connection to a Web site is secured using Internet Explorer version 7 or higher look for https in the browser address box and a lock icon to the right of the address box see Figure 18 71 or in the case of earlier versions of IE at the bottom of the window EN OO J gt N N P l e N 978 CHAPTER 18 Networking Practices Wy ue Wi fem te ie iremtie oa loppan bass p Geet lm Addam AET i z aT 7 fangs amp CD TLLA FARTO A ks Pt I art TEE Ae Pa ae es i B m P ted Med Cee i AHA Figure 18 71 A secured connection from browser to Web server Courtesy Course Technology Cengage Learning If you have a problem with connecting to a secured Web site from a corporate net work you might be using the wrong proxy server on the network Check with your net work administrator to find out if a specific proxy server should be used to manage secure Web site connections If this is the case click Tools Internet Options to open the Internet Options box Click the Connections tab and then click LAN settings In the Local Area Network LAN Settings box check Use a proxy server for your LAN and then click Advanced refer back to Figure 18 70 In the box notice that the second row can be used to enter the IP address of the proxy server that is to manage HTTPS connections Recall from Chapter 17 that an SSH client is sometimes used in place of Telnet to communicate wit
3. Figure 18 45 This wireless access point supports several encryption methods Courtesy Course Technology Cengage Learning ITI E stall Birdies Shamed Duane a 00 a ed Io eee ee ee Se Bi Daper Ep ee asus EN Iq E ie iai ii iy mum po TS SSG Se Bd ith hhh ui rr RRR May ar mp BDG a a DE warp EMENI pop DEEEH E i z byen EP epea hrinu Wo Cn Pi dema ee Figure 18 46 Configure how the access point will filter MAC addresses Courtesy Course Technology Cengage Learning Tools and Utilities for Supporting and Troubleshooting Networks 955 We ve just configured your wireless access point to use several security features Is it really necessary to use them all Well not really Encryption is essential to keep others from hack ing into your wireless data and to prevent unauthorized use of your wireless LAN For most situations that s all you need For added protection you can disable SSID broadcasting or filter MAC addresses TOOLS AND UTILITIES FOR SUPPORTING AND TROUBLESHOOTING NETWORKS When supporting and troubleshooting small networks you ll need to use cable testers to test the physical connections of the network and several TCP IP utilities to test TCP IP connectivity In addition Remote Desktop and Remote Assistance can be a great help when supporting networks and their users In this part of the chapter you ll learn how to use all these tools CABLE TESTERS A cable tester can be used
4. 6 On the next screen see Figure 18 13 fill in the information for the User name and Password given to you by your ISP The Connection name can be any name you like At the bottom of the screen there is also a check box that will allow other users on this computer to use the connection Click Connect Type the iebnematine from jour internet sendor prereider SP arri pus EIP ass ea P apam cw HP jars em L m ii n MEL Hef pat ar P She athe pasce une Pri opis gm Ties tte plied perum adis ae eet Bg Mee rro te gee bet pom Like i ia ae BE Figure 18 13 Enter the information given to you by your ISP Courtesy Course Technology Cengage Learning 7 Vista assumes the connection will use dynamic IP addressing and attempts to make the connection If you are using static IP addressing the connection will fail and you will see the screen in Figure 18 14 For that situation click Set up the connection anyway On the next screen click Close Connecting to the Internet 929 The tenet connertksfy best Gas unmicpesrhil Try ajain Chana Dep probhimrn SH up the ennneeion Ano gu ES Figure 18 14 The connection failed Courtesy Course Technology Cengage Learning 8 For Windows XP you can configure an on demand connection when first configuring the network connection using the New Connection Wizard The window on the wizard that you use is shown earlier in Figure 18 4 Click Connect u
5. A It s extremely important to protect access to your network and prevent others from hijacking your router Do that by changing the password to the router firmware If the firmware offers the option disable the ability to configure the router from over the wireless network see Figure 18 32 4 __ Go p EM P tn Change password to router firmware utility Lt Fe feng on mee SLLDISDIS See h gue E IHZENHFINSENEEFRHNE EE y nicum Parr Derma n heed Lomas mii Disable wireless access to firmware es ee Pedct apn m un der cn Sere WTTEU ore aya ee LL iey F ume AS hee inten Eae De i gt Mm Figure 18 32 Prevent others from hijacking your router Courtesy Course Technology Cengage Learning 4 In the Internet Setup area dynamic IP addressing is called Automatic Configuration DHCP If a host name and domain name have been given to you by your ISP enter them here Most likely you ll leave them blank 4 If your ISP has assigned you a static IP address click the drop down box near the top of the Internet Settings area and change this setting to Static IP see Figure 18 33 You can then enter the IP address assigned to you by your ISP as well as the subnet mask and IP addresses of the default gateway and DNS servers 4 You can configure the DHCP server under Network Setup in Figure 18 31 Notice in the figure that the router is configured to se
6. e CH oe Figure 18 77 This Web portal is used to manage a VoIP service Courtesy Course Technology Cengage Learning 982 Troubleshooting Network and Internet Connections 983 4 We can add or remove users as our company s payroll changes with no extensive implementa tion charges or technical difficulties 4 Each of our users can program various phone numbers into their account such as cell phone home phone or home office phone numbers They can then tell the system at which phone to direct their individual incoming calls Each call can be sent sequentially through the list of numbers or blast all numbers simultaneously Voice mail messages and faxes can all be forwarded to our various e mail accounts and even the message itself is attached for immediate review When we travel we can take the service with us I can pack my IP phone or ATA and plug it up wherever I am if I have high speed Internet access Even without the phone or adapter I can still use a computer to access my Web portal and make calls from the portal Web site With all this it seems there would be no drawbacks But all is not well in paradise We ve had a few issues with dropped calls or annoying delays while talking Sometimes we have to hang up and call the person back Occasionally the signal will phase out briefly where one party can hear the other but not vice versa And if your ISP drops your service for any reason even just a temporary outa
7. 192 168 1 102 958 CHAPTER 18 Networking Practices zB ee d T enm Figure 18 49 The Nslookup command reports information about the Internet name space Courtesy Course Technology Cengage Learning THE TRACERT COMMAND The Tracert trace route command can be useful when you re trying to resolve a problem reach ing a destination host such as an FTP site or Web site The command sends a series of requests to the destination computer and displays each hop to the destination For example to trace the route to the www course com site enter this command in a command prompt window tracert www course com The results of this command are shown in Figure 18 50 By default the command makes 30 requests for up to 30 hops The final 15 requests in the figure were not needed to show the complete path to the site causing a Request timed out message to appear Also the Tracert command depends on ICMP information sent by routers when a packet s hop count has been exceeded see Figure 18 51 Some routers don t send this information If a router doesn t respond the Request timed out message appears THE NET COMMAND The Net command is several commands in one These options are Net accounts Net computer Net config Net continue Net file Net group Net help Net helpmsg Net localgroup Bb umm a ee T Figure 18 50 The Tracert command traces a path to a destination computer Courtesy Course Technology Cengage Learning Tools and Uti
8. Assistance invitation from six to 12 hours What are the steps to start a Remote Assistance session when using Windows Messenger A W N H2 What is the time until expiration for an invitation when using Windows Vista When using Windows XP PROJECT 18 3 Investigating Verizon FiOS Verizon www verizon com is currently offering an alternative to DSL and cable modem for broadband Internet access FiOS is a fiber optic Internet service that uses fiber optic cable all the way to your house for both your residential telephone service and Internet access Search the Web for answers to these questions about FiOS 1 Give a brief description of FiOS and how it is used for Internet access 2 What downstream and upstream speeds can FiOS support 3 When using FiOS does your telephone voice communication share the fiber optic cable with Internet data 4 What does Verizon say about FiOS cabling used for television 5 Is FiOS available in your area 988 CHAPTER 18 Networking Practices PROJECT 18 4 Practicing Using FTP Practice using FIP by downloading the latest version of Firefox a Web browser using three different methods Do the following 1 Using your current browser go to the Mozilla Web site at www mozilla org and down load the latest version of Firefox What is the version number What is the name of the downloaded file In what folder on your hard drive did you put the file 2 Using your current browser as an
9. FIP client locate the same version of Firefox and the same file at the Mozilla FTP site ftp mozilla org and download it to your PC What is the path to the Firefox file on the FIP site In what folder on your hard drive did you put the file PROJECT 18 5 Teaching Yourself About Windows Meeting Space Using the Windows Help and Support window search for information on Windows Meeting Space Describe the tool When would you want to use it What can you do with Windows Meeting Space Set up and test the tool with a friend on a network connection REAL PROBLEM 18 1 Firewalling Your Home Network At first Santiago had only a single desktop computer an ink jet printer and a dial up phone line to connect to the Internet Then his wife Maria decided she wanted her own computer Later they both decided it was time for a broadband connection to the Internet and chose cable So now their home network looks like that shown in Figure 18 79 Santiago chose to use a crossover cable to connect the two computers and the cable modem connects to Santiago s computer using a USB cable The computer connected to the Internet uses Internet Connection Sharing to serve up Internet access to the other computer Cable modem i e i ff TV jack JEZEN m c E oeste Ss A SE Host computer Crossover cable Figure 18 79 Two networked computers sharing an Internet connection Courtesy Course Technology Cengage Learning Both computers are c
10. Internet at all do the following to recycle the connec tion to your ISP a Turn off the cable modem DSL modem or other device that you use to connect to your ISP Turn off the router b Turn back on the cable modem DSL modem or other ISP device Wait until the lights settle Then turn on your router c On any PC on your network release and renew the IP address Open your browser and try to browse some Web sites 7 For a cable modem check to make sure your television works The service might be down 8 Perhaps the problem is with your router or one of its features Try accessing the Internet without using the router First configure Windows Firewall on one PC for maximum protection blocking all uninvited communication Configure TCP IP on your PC to match up with what your ISP is using dynamic or static IP addressing Then use a network cable to connect this PC directly to your cable modem DSL modem or other Internet device If you can access the Internet you have proven the problem is with the router or cables going to it To eliminate the cables as a problem replace them Connect the router back up to the PC and check all the router settings The problem might be with DHCP the firewall settings or port forwarding Try updating the firmware on the router If you are convinced all settings on the router are correct but the connection to your ISP works without the router and does not work with the router it s time to rep
11. My Network Places and select Properties from the shortcut menu The Network Connections window opens See Figure 18 3 Click Create a new connection sate te ele 5 x E 4 bar ome Im oci nn aj ee he l N D i ita the Sika ail ange prion oiim Figure 18 3 Using Windows XP launch the New Connection Wizard Courtesy Course Technology Cengage Learning 6 The New Connection Wizard opens Click Next to skip the welcome screen On the next screen select Connect to the Internet and click Next 7 On the next screen select Set up my connection manually and click Next On the following screen see Figure 18 4 select Connect using a broadband connection that is always on and then click Next The wizard creates the connection Click Finish to close the wizard erm de piu mee RS corruit As up bn Carseat akg alae bess Tha tpe of connector uses a modam ard a rige ce ISDN phon ina i rantes meia a brnadhband conrieciuse thal rerums user fame and po RENE sree NLR PRC I tiri Traa a behepeed comvecten ew arare see OSL or LAN ur bm ety cee amd qae pour gom Figure 18 4 Choose the type of Internet connection Courtesy Course Technology Cengage Learning Connecting to the Internet 923 When setting up a cable modem you might want to connect your TV to the same jack that the cable modem is using In this situation connect a splitter to the jack and then connect the cable modem and TV cables to the splitter I
12. N N m l N CHAPTER 18 Networking Practices 72 13 18 200 192 168 1 100 have data for 72 13 18 200 3389 192 168 1 90 192 168 1 102 Figure 18 39 With port forwarding a router allows requests initiated outside the network Courtesy Course Technology Cengage Learning B meteg Taree Mentos iit Egle O Gide ee omniom mis Eai Pes a Fiweriet ga U pihs gt Ded Mesa A LINKSYS by Cisco Applications amp Gaming Figure 18 40 Port triggering opens a range of ports when data is sent from inside the network Courtesy Course Technology Cengage Learning 4 If the computer using port triggering stops sending data the router might close the trig gered port before communication is complete Also if two computers on the network attempt to trigger the same port the router will not allow data to pass to either computer 4 Be aware that when you use port forwarding or port triggering your network is more vul nerable because you are allowing external users directly into your private network For better security turn on port forwarding only when you know it s being used In addition make sure the computer that is receiving outside communication is using a software firewall for example Windows Firewall and antivirus software In fact to be on the safe side recognize that every computer on your network is more vulnerable and be careful to secure each one Setting Up a SOHO Network 95
13. another cable TV jack in your home 3 If this doesn t work call the cable company s help desk The technician there can release and restore the connection at that end which might restore service If this doesn t work there might be a problem with the cable company s equipment which the company will need to repair CONNECT TO THE INTERNET USING DSL DSL service and an older technology ISDN are provided by the local telephone company An up and coming second generation DSL called DSL over Fiber in the Loop DFITL uses dedicated fiber optic cable to bring DSL to your neighborhood A DSL installation works pretty much the same way as a cable modem installation Here are the steps that are different 1 Read the directions that came with the DSL modem and follow them If your DSL modem came with a setup CD you can run that setup to step you through the instal lation including installing the drivers for a modem that uses a USB connection You might be instructed to run a setup CD on your PC before you connect the modem or you might need to install the modem first Connecting to the Internet 925 2 To prevent static on the line install a telephone filter on every phone jack in your house that is being used by a telephone fax machine or dial up modem See Figure 18 7 Figure 18 7 A DSL filter is required to eliminate static on regular telephones Courtesy Course Technology Cengage Learning 3 Connect the DSL modem as sh
14. e mail message to a corporate help desk The e mail contains an attached file that the technician uses to respond to the invitation This method works well when both people belong to the same domain and no hardware firewalls are between them A The technician can initiate a session This method is the most difficult to use requiring that Group Policies be applied on the technician s computer Use the following steps to initiate a Remote Assistance session when the user sends you an invitation First ask the user to send you the invitation When she does so her computer is set up to respond to Remote Assistance communication She must do the following 1 Click Start Help and Support In the Help and Support window click Windows Remote Assistance The window in Figure 18 61 appears feo veni vat io ask bor oe iri hex Wants Rampe Zotac COP Cac Co io the ane Den cas Belg trop cord m hi priemy qun hae rp hrs pue HT 5 Oey a is Freie POFTHPOTWE yu Ered 6o Dwip vou B vasa up Sects epee DTIZMA gl QUA REA DU ED Hu AH ER ME A Pg from Ihi Lim paru CHfer to Palo someone Das Pye dpa G coe p ope a Farms dja BN PLI Les Figure 18 61 The user can invite someone to help Courtesy Course Technology Cengage Learning Tools and Utilities for Supporting and Troubleshooting Networks 967 2 Click Invite someone you trust to help you On the next window click Save this invitation as a file 3 On the next window see Figure 18 62
15. protect the network from unsolicited activity from the network or Internet 4 It s extremely important to change the password to configure your router as soon as you install it especially if the router is also a wireless access point 4 A router on a small network is most likely able to be configured to use DHCP access restrictions port filtering port forwarding and port triggering A Security for a wireless access point includes MAC address filtering disabling SSID broadcast ing and encryption WPA2 WPA or WEP The access point can also be a DHCP server 4 Use cable testers to test cables and trace network cables through a building 4 Useful Windows TCP IP utilities are Getmac Ipconfig Net Netstat Nslookup Ping Telnet and Tracert Use third party SSH client and server software to replace Telnet when a secured connection is needed 4 Remote Desktop and Remote Assistance can be used to connect remotely to a computer and manage the Windows desktop Remote Desktop is better used to connect to your own computer and Remote Assistance is designed to assist other users with their comput ers Both use the RDP protocol 4 When troubleshooting network problems check hardware device drivers Windows and the client or server application in that order Reviewing the Basics 985 For explanations of key terms see the Glossary near the end of the book domain profile port triggering Remote Desktop ferrite clamp private prof
16. sky 2 Double coaxial cables are installed from the dish to the room in your building where the satellite modem will sit The modem should sit near your computer or router Connecting to the Internet 931 3 Coaxial cables are plugged into two ports on the modem most likely labeled Sat In and Sat Out An Ethernet cable is connected to the RJ 45 port on the modem and the RJ 45 port on your PC 4 The connection is configured in Windows A satellite service is an always up service that most likely uses dynamic IP addressing CONNECT TO THE INTERNET USING A DIAL UP CONNECTION You never know when you might be called on to support an older dial up connection Here are the bare bones steps you need to set up and support this type connection 1 Install an internal or external dial up modem How to install a modem card is covered in Chapter 9 Make sure Device Manager recognizes the card without errors 2 Plug the phone line into the modem port on your computer and into the wall jack 3 For Vista open the Network and Sharing Center window and click Set up a connec tion or network 4 On the next window select Set up a dial up connection and click Next 5 On the next window see Figure 18 17 enter the phone number to your ISP your ISP username and password and the name you decide to give the dial up connection such as the name and city of your ISP Then click Connect 6 For Windows XP click Create a new connection in the
17. the user verifies the location of the file the Windows desktop enters a password confirms the password and then clicks Finish The file is created and the Windows Remote Assistance window appears see Figure 18 63 EERTE Tar the kiiman as a tile dar pre mey ra men iw garni A ie yom ee ete m an eerie phit or by pany H fO p dhi a cence dear or a mater lider Va rrr gaes ries panraspnr No Ther per tos yog ans mug eer im person oec by pisse Your baper sli ana 6 io roenedi tm yos Compu Erase pat ant fi ree inpertaet For pag Atc ed ork dan D3 Coates heh oar fps a Pte eee ee eee E Ica ai Figure 18 62 The user creates a password for you to use Courtesy Course Technology Cengage Learning EN OO Figure 18 63 Remote Assistance waiting for incoming connection J gt N N e Courtesy Course Technology Cengage Learning UE N The user must send you the invitation file and tell you the password She can attach it to an e mail message or chat session or hand it to you on a jump drive When you have the invitation file and password follow these steps to accept the invitation 1 Click Start Help and Support and click Windows Remote Assistance Alternately you can enter Windows Remote Assistance in the Vista Start Search box On the first box refer back to Figure 18 61 click Offer to help someone On the second box see Figure 18 64 click Browse and point to the location of the invitatio
18. to make sure your router is not blocking communication 1 Verify that NAT redirection settings are correct Is port forwarding enabled for the speci fied ports Is the range of ports correct for this client application Check the program documentation to find out what range it uses There might be more than one port or a range of ports If you can t find the information in the documentation search the Internet 2 Is port forwarding set to the correct IP address on the network Verify the computer is using this IP address Set the computer for static IP addressing or set the router to always serve up this IP address to this computer 3 Check the access restrictions screen of the router and make sure restriction policies are not applied For example is the router configured to deny service for a certain day of the week or time of day Is the MAC address or the IP address of the PC in the list of addresses that are denied Internet access Verify that a service is not blocked For example the IMAP and POP3 services are listed under Blocked Services in Figure 18 69 These services are needed to receive e mail on the network MAP ite 3 POP3 E ao Add EdiSemice Figure 18 69 Blocked services prevent communication across the firewall Courtesy Course Technology Cengage Learning 4 The access restriction feature of the router can also block certain Web sites by URL or block Web site content by keywords Verify the content o
19. to other cables gt gt 4 Cable modem and DSL boxes connect to a PC by way of a USB or network cable They connect to a router using a network cable The router provides additional firewall security to a network 4 If static IP addressing is used to connect to the Internet you ll need to know the IP address assigned to you by your ISP the IP address of one or two DNS servers the subnet mask and the IP address of the default gateway the IP address of a server at the ISP Static IP addressing is used for business accounts so that others on the Internet can initi ate communication with services they provide 4 Satellite Internet access in North America uses a satellite dish that faces the southern sky 4 Vista can assign a public private or domain profile to a network connection The assigned profile determines the degree of security applied The profile with the highest security is a public profile 4 Vista manages network connections using the Network and Sharing Center and XP manages connections using the Network Connections window 4 Windows Firewall is a software firewall that can provide varying degrees of security on a single computer 4 A wired network can use 10BaseT 100BaseT and 1000BaseT Ethernet For fastest speeds make sure all devices on the network use 1000BaseT 4 Local Ethernet networks use twisted pair UTP or STP cables rated at CATSe or higher 4 Use a firewall on the host computer or router to
20. 1 By the way if you want to use a domain name rather than an IP address to access a computer on your network from the Internet you ll need to purchase the domain name and register it in the Internet name space to associate it with your static IP address assigned by your ISP Several Web sites on the Internet let you do both one site is by Network Solutions at www networksolutions com HOW TO SET UP A WIRELESS NETWORK Some desktop computers come equipped with a wireless adapter such as the one in Chapter 17 in Figure 17 16b that can be configured as a client on a wireless network or as the access point of a wireless network A wireless access point can also be a stand alone device such as the one in Figure 18 41 by D Link The device supports 802 11g n and contains a four port Gigabit switch to connect up to four devices to your wired network An access point can also serve other purposes such as the Linksys multifunctional router shown earlier in Figure 18 29 When select ing a wireless access point consider the 802 11 standards it supports and the security standards it uses Recall from Chapter 17 that security standards include disabling SSID broadcasting WPA or WPA2 encryption or perhaps the outdated WEP encryption and MAC address filtering Figure 18 41 Xtreme N Duo Wireless Bridge Access Point by D Link Photo Courtesy of D Link Systems Inc The A 220 702 Practical Application exam expects you to know how to install and c
21. CHAPTER 18 In this chapter you will learn How to connect a computer or small network to the Internet using a broadband satellite or dial up connection How to configure a SOHO router and set up a wireless network About tools and utilities used to troubleshoot problems with network and Internet connections How to trou bleshoot connec tivity problems with networks and client applications Networking Practices I n the last chapter you learned about hardware used to build a network and how to connect a computer to an existing network This chapter takes the next logical step in learning about networking by discussing connections to the Internet using Windows and how to set up a Small Office Home Office SOHO network You will then learn about several tools and utilities that you will need when sup porting a small wired or wireless network Finally you will learn how to troubleshoot problems when network and Internet connections fail Security is always a huge concern when dealing with networks In this chapter you will learn how to use a software and hardware firewall to protect a network In the next chapter we take security to a higher level and discuss all the many tools and techniques you can use to protect a single computer or a SOHO network 9 A Exam Tip All the content in this chapter applies to networking objectives on the A 220 702 Practical Application exam 919 920 CHAPTER 18 Network
22. Connect Select two explanations and their solutions that are reasonable and might work Select two explanations and solutions that are not reasonable and explain why they won t work a The browser has been set to work offline On the File menu verify that Work Offline is not checked b The connection to the cable modem is down In the Network and Sharing Center click view status for the LAN connection and select Diagnose Hands On Projects 987 c Windows Firewall is enabled on your PC Disable it d The cable modem is not working Go to Device Manager and check for errors with the cable modem PROJECT 18 1 Practicing TCP IP Networking Skills While connected to the Internet or another TCP IP network answer these questions What is your current IP address Release and renew your IP address Now what is your IP address Are you using dynamic or static IP addressing How do you know 1 2 3 4 What is your adapter address for this connection 5 What is your default gateway IP address 6 What response do you get when you ping the default gateway PROJECT 18 2 Researching Remote Assistance A technician needs to know how to find information he needs to help users and trou bleshoot problems Using sources you can trust answer the following List your source of information for each question What are the steps to cancel a Remote Assistance invitation before it expires What are the steps to extend a Remote
23. Network Connections window Follow the steps of the wizard which are similar to those of Vista Go X Er 4 Sart TETT m p t Pope ihe iene rue foo ence birri eee npimeder SP Daio p pbp cam hore tere cp ELE pees Fig kame Hume row ISP get Pp para rule Sheps eee es acere m nnam aii ep erri n LB Alpe Fhe peepee it une et Ceres Ties pleat lied irroplab ath ernie ME fhe eee 12 am nd ee hn Figure 18 17 Configure a dial up connection Courtesy Course Technology Cengage Learning To use the connection go to the Vista Network and Sharing Center and click Connect to a network Select the dial up connection and click Connect The Connect dialog box appears see Figure 18 18 Click Dial You will hear the modem dial up the ISP and make the connection For XP double click the connection icon in the Network Connections window and then click Dial EN 060 J gt N N P l e N 932 CHAPTER 18 Networking Practices Figure 18 18 Make a dial up connection to your ISP Courtesy Course Technology Cengage Learning To view or change the configuration for the dial up connection do the following 1 In the Vista Network and Sharing Center click Manage network connections and then right click Dial up Connection or other name assigned the connection and select Properties from the shortcut menu For XP right click the connection icon in the Network Connections window and select
24. P address of the remote computer Next try the Ping command using the computer name of the remote computer If the Ping command works when using an IP address but does not work when using a host name on the local network check the Hosts file on the local computer Make sure the IP address and host name entry line in the file are correct The problem might also be with wrong entries in DNS servers that are used on the corporate network One or more DNS servers might hold an entry that relates the IP address to the wrong host name 4 These commands can help solve problems with host names on the local network a Use the nslookup command to find the computer s IP address b Try this command net view computername If two computers on the network have the same computer name the command reports this error Then change the name of one computer 5 If you can ping or Net view a computer but cannot access it in the Network window or My Network Places verify the computer is in the same domain or workgroup that the local computer is in Also make sure the remote computer has File and Printer Sharing turned on Also verify that the user account and password are the same on both computers 6 Use this command to verify that resources on a remote computer are shared net view computername The command should list the shared resources If the command gives an error about access being denied the problem is with permissions Make sure th
25. Properties from the shortcut menu The connection Properties box opens as shown in Figure 18 19 for Vista The XP box is similar da Dap Loanne Papata en Da aty E Cores u J e a Cet re ee E Cmm Feria om a ibm ag Xo ihi em dig Ewa a i f Figure 18 19 Configure an Internet connection using the Properties window of the connection icon Courtesy Course Technology Cengage Learning Connecting to the Internet 933 2 Use the tabs on this window to configure TCP IP Networking tab control the way Windows attempts to dial the ISP when the first try fails Options tab and change other dialing features If the dial up connection won t work here are some things you can try 4 Is the phone line working Plug in a regular phone and check for a dial tone Is the phone cord securely connected to the computer and the wall jack 4 Does the modem work Check Device Manager for reported errors about the modem Does the modem work when making a call to another phone number not your ISP 4 Check the Dial up Connection Properties box for errors Is the phone number correct Does the number need to include a 9 to get an outside line Has a 1 been added in front of the number by mistake If you need to add a 9 you can put a comma in the field like this 9 4045661200 which causes a slight pause after the 9 is dialed 4 Try dialing the number manually from a phone Do you hear beeps on the other end 4 Try anoth
26. able network or USB port A cable modem and a network or USB cable to connect to the PC The TCP IP settings to use to configure TCP IP provided by the cable modem company For most installations you can assume dynamic IP addressing is used If static IP addressing is used you ll need to know the IP address the IP address of one or two DNS servers the subnet mask and the IP address of the default gateway the IP address of a server at the ISP bb b b The setup for a cable modem connection using a network cable is shown in Figure 18 1 Follow these instructions to connect a computer to the Internet using a cable modem connection an Ethernet cable to connect the PC to the modem and dynamic IP addressing 1 Select the TV wall jack that will be used to connect your cable modem You want to use the Jack that connects directly to the point where the TV cable comes into your home with no splitters between this jack and the entrance point Otherwise in line splitters can degrade the signal quality and make your connection erratic The cable company can test each jack and tell you which jack is best to use for the cable modem one good reason to have a technician come and hook you up for the first time Later if your cable modem connection is constantly going down you might consider that you ve chosen the wrong jack for the connection Connecting to the Internet 921 Rear of PC Network cable Cable modem TV cable wall ou
27. acks on either side of the wall between the two rooms The plan allows for all five desktop computers and a network Setting Up a SOHO Network 941 e rrr Switch RJ 45 wall jacks on both walls Router TV jack Cable modem Network printer Figure 18 28 Plan the physical configuration of a small network Courtesy Course Technology Cengage Learning printer to be wired with cabling neatly attached to the baseboards of the office without being a trip hazard INSTALL AND CONFIGURE A ROUTER FOR A SMALL NETWORK To install a router that comes with a setup CD run the setup program on one of your computers on the network doesn t matter which one Follow the instructions on the setup screen to disconnect the cable modem or DSL modem from your host computer and connect it to the router Next connect the computers on your network to your router A computer can connect directly to a network port on the router or you can connect a switch or hub to one port on the router The switch or hub can then provide multiple ports for computers to connect Plug in the router and power it on You ll be required to sign in to the utility using a default password The first thing you want to do is reset this password so that others cannot change your router setup Changing the router password is especially important if the router is a wireless router Unless you have disabled or secured the wireless access point anyone outside your buildi
28. and you are using dynamic IP addressing with your ISP try rebooting the cable modem or DSL modem Also try this command to flush the DNS cache kept on the computer c Try pinging your DNS server To find out the IP address of your DNS server open the firmware utility of your router and look on a status screen d If your ISP is providing you with a static IP address and with IP addresses for DNS servers you must manually enter these values into your router firmware utility Contact the ISP and verify the DNS IP addresses you are using are correct You can find this information in the support section of the ISP Web site Troubleshooting Network and Internet Connections 975 3 If you re having a problem accessing a particular computer on the Internet try using the tracert command for example tracert www course com The results show computers along the route that might be giving delays 4 If one computer on the network cannot access the Internet but other computers can check the MAC address filtering on the router Make sure this computer is allowed access To find out a PC s MAC address use the Getmac or Ipconfig command 5 Perhaps the problem is with your firewall Verify your firewall settings Zone Alarm sometimes gives this type of problem Try disabling Zone Alarm to eliminate it as the problem To completely disable it make sure all Zone Alarm services and processes are stopped 6 If you are not able to access the
29. cations amp Gaming tab shown in Figure 18 38 In the figure the Remote Desktop application outside the network can use port forwarding to communicate with the computer whose IP address is 192 168 1 90 using port 3389 The situation is illustrated in Figure 18 39 This computer is set to support the Remote Desktop server application Later in the chapter you will learn to use Remote Desktop To configure port triggering click the Port Triggering tab and enter the two ranges of ports For example in Figure 18 40 the Triggered Range of ports will trigger the event to open the ports listed under Forwarded Range Here are some tips to keep in mind when using port forwarding or port triggering 4 You must lease a static IP address from your ISP so that people on the Internet can find you Most ISPs will provide you a static IP address for an additional monthly fee 4 For port forwarding to work the computer on your network must have a static IP address so that the router knows where to send the communication p ero o PES G E y HEL ee ree ii Tie E Kum enia Tech Help a Pesin ya BP eppi tes t p Leni Mere Addo gg oem Fort Foraa cir LINKSYS by Cisco Applications amp aming Figure 18 38 Using port forwarding you can program your router to allow activity from the Internet to initiate a session with a computer inside the network on a certain port using a static IP address Courtesy Course Technology Cengage Learning J gt
30. ct to make the connection Click Connect again when a warning box appears If another warning box appears click Yes a E m Lim B m ml kF Connection a k ee Poe EETA PPE i ers i eb p Se ERIT Lira esca arci aene DD lp ee oe e ey pim a Pete LET cl Figure 18 56 Allow drives and other devices to be shared using the Remote Desktop connection Courtesy Course Technology Cengage Learning 4 A Windows security box appears that is displayed by the remote computer see Figure 18 57 Log on using a user name and password for the remote computer 5 The desktop of the remote computer appears as shown in Figure 18 58 When you click the desktop you can work with the remote computer just as if you were sitting in front of it except response time will be slower To move files back and forth between computers use Windows Explorer on the remote computer Files on your local computer will appear under Network or My Network Places in Windows Explorer on the remote computer To close the connection to the remote computer simply close the desktop window Tools and Utilities for Supporting and Troubleshooting Networks 963 Enter rur credentials Tasa cidem wall be aai be connect Ip oral anao Figure 18 57 Enter your user name and password on the remote computer Courtesy Course Technology Cengage Learning EN OO Figure 18 58 The desktop of the remote computer is available on your local computer gt N N Co
31. ction icon in the Network Connections window Then you double click the icon and the Connect dialog box opens You click Dial to make the connection An error message appears saying There was no dial tone What is the first thing you do a Check Device Manager for errors with the modem b Check with the ISP to verify that you have the correct phone number username and password c Check the phone line to see if it s connected d Check the properties of the dial up connection icon for errors You have set up a small LAN in your home with two Windows XP PCs connected to the Internet using a DSL connection You have a DSL router box connected to the DSL and to a small switch Your two PCs connect to the switch You can browse the Internet from either PC However you discover that each PC cannot use the resources on the other PC What is the problem and what do you do a The network switch is not working Try replacing the switch b The NICs in each PC are not working Try replacing one NIC and then the next c The Local Area Connections in the Network Connections window are not working Delete the connections and re create them d Files and folders are not shared on either PC Use Windows Explorer to correct the problem You connect to the Internet using a cable modem When you open your browser and try to access a Web site you get the error The Web page you requested is not available offline To view this page click
32. current IP address ipconfig release 4 To request a new IP address ipconfig renew 4 To display information about Ipconfig ipconfig Net Get information about the Net command Net use Displays a list of network connections Netstat Displays information about current TCP IP connections Nslookup Displays information about domain names and their IP addresses Ping Verifies that there is a connection on a network between two hosts Here are variations of Ping 4 To test for name resolution ping a 69 32 142 109 4 To continue testing until interrupted ping t 69 32 142 109 4 To test with a data packet that is 1000 bytes in size ping 1 1000 69 32 142 109 Telnet Allows you to communicate with another computer on the network remotely entering commands to control the remote computer The connection is not secured Tracert Traces and displays the route taken from the host to a remote destination Tracert is one example of a trace routing utility Table 18 1 TCP IP utilities available with Windows Figure 18 49 shows the results Notice in the figure that the DNS server knows about two IP addresses assigned to www microsoft com It also reports that this information is nonauthoritative meaning that it is not the authoritative or final name server for the www microsoft com computer name A reverse lookup is when you use the Nslookup command to find the host name when you know a computer s IP address such as nslookup
33. e Courtesy Course Technology Cengage Learning METT F Rm cir me Paeum Pep Hum ea P oen CIE TES I ijeh te pee a ified i CISCO anin E rere iPeseeniviees Dm Aa Figure 18 35 Configure the router s firewall to prevent others on the Internet from seeing or accessing your network Courtesy Course Technology Cengage Learning Setting Up a SOHO Network 947 4 You can set policies to determine how and when users on your network can access the Internet To do that click Access Restrictions The window shown in Figure 18 36 appears allowing you to set policies about the day and time of Internet access the ser vices on the Internet that can be used and the URLs and keywords that are not allowed L HEIFEEMIBETIFIPIMIPOTIT Ae oe eS Resimclioris adii Bb te m T ry Sta Pii 8 hai heaped Hii LIT in I1 T TI I itt r Fhe n j a Bb Tah pA E Shs a a i ire Aogpwremar i fer Tu Had Tu we Nul irreg E i4 Sar fim ada e unu i PE a zm a ra TUI fareerd 1 hr cas feed i ope rhon l Fikia i e LHE E ad Hn Peg a TEE qudd dd i WIEE S dd dd P mH BET qUE 317E EB pied ii Aic Baye E Proba a icm Figure 18 36 Configure the router s firewall to limit Internet access from within the network Courtesy Course Technology Cengage Learning PORT FORWARDING AND PORT TRIGGERING Too much security is not always a good thing There are legitimate times you want to be able
34. e Remote Assistance uses port 3389 the same port used by Remote Desktop TROUBLESHOOTING NETWORK AND INTERNET CONNECTIONS If you have problems connecting to the network you can follow the flowchart in Figure 18 67 to eliminate hardware device drivers the Windows configuration and applications when troubleshooting network connections Recall that networking happens in layers This flowchart reminds us troubleshooting Eden problems with networking starts at the bottom layer hard Troubleshooting a Network ware and proceeds to the top layer applications 970 CHAPTER 18 Networking Practices Do status lights indicate a problem Does Device Manager report errors Do Windows networking utilities and tools report problems Does the client application report a problem Figure 18 67 Flowchart to troubleshoot network connections Courtesy Course Technology Cengage Learning The A 220 702 Practical Application exam expects you to know how to troubleshoot network problems by using cable testers and checking TCP IP settings firewall settings proxy settings and protocol settings used within client applications All these skills are covered in this part of the chapter Now let s look at the strategies you can use to troubleshoot network problems starting first with hardware and then proceeding to TCP IP settings within Windows and finally by checking protocol settings used with the c
35. e account you are using is an account recognized by the remote computer Try this command to pass a new account to the remote computer net use computername user username 974 CHAPTER 18 Networking Practices In the above command if there is a space in the username enclose the username in double quotation marks as in net use computername user Jean Andrews 7 If the net view command using a computer name does not work try the command using the remote computer s IP address as in net view 192 168 1 102 If this command works the problem is likely with name resolution Make sure the computer name you are using is correct and the computer is in your workgroup or domain 8 If you re having problems getting a network drive map to work try making the connection with the net use command like this net use z computername folder To disconnect a mapped network drive use this command net use z delete If you can see resources on the local network but cannot access the Internet do the following 1 Try to ping your default gateway using its IP address If that doesn t work move on to Step 5 2 To eliminate DNS as the problem follow these steps a Try substituting a domain name for the IP address in a ping command If this ping works then you can conclude that DNS works If an IP address works but the domain name does not work the problem lies with DNS b If DNS is being provided by your ISP
36. e days and thankfully technology is adapting When we first began investigating phone systems we tried to patchwork together various telco local telephone company services but with dismal results Then we began researching several VoIP providers from the industry flagship Vonage www vonage com to smaller and lesser known companies With a lit tle searching we found a company that provides the services important to us Here are a few features 4 We were able to buy the digital phones and ATA adapters from this company that configured and tested them for us before shipping and then taught us how to use them 4 We were able to port our existing toll free number to our new VoIP account 4 Weare able to transfer live calls from one team member to another with three or four digit dialing and no long distance charges for the transferred calls even with our team spread over several states 4 We have an integrated voice mail system using a Web portal One window of our portal is shown in Figure 18 77 4 We can easily set up conference calls with the entire team A A single auto attendant handles all incoming calls or we can direct incoming calls to any num ber and still use the auto attendant as a convenient backup 4 The company provided professional voice talent to record our auto attendant message and other call tree menu options 4 We have unlimited long distance even for our high volume salespeople ues 3 Fh p m F Kx 50
37. en to you by your ISP for the first two DNS servers If your ISP gave you IP addresses for a third or fourth DNS server click Advanced and enter those IP addresses on the DNS tab in the Advanced TCP IP Settings box and click OK 4 Click OK twice to close the two dialog boxes Then close the Network Connections window EN 060 J gt N N P l e N 930 CHAPTER 18 Networking Practices Figure 18 15 Use the Network Connections window to manage these connections Courtesy Course Technology Cengage Learning Figure 18 16 Use the Connection Properties box to configure IP addressing Courtesy Course Technology Cengage Learning 5 To configure a Windows XP network connection for static IP addressing right click the Local Area Connection icon in the Network Connections window and then select Properties from the shortcut menu Local Area Connection is the default name for this icon it might have been given a different name The properties box opens Select Internet Protocol TCP IP and click Properties Configure the TCP IP properties the same as with Windows Vista CONNECT TO THE INTERNET USING SATELLITE The Federal Communications Commission FCC requires that a trained technician install a satellite Internet service The technician that does the installation will generally follow these steps 1 The technician installs the satellite dish For North America the dish faces south with an unobstructed view of the southern
38. er phone number 4 When you try to connect do you hear the number being dialed If so the problem is most likely with the phone number the phone line or the username and password 4 Is TCP IP configured correctly Most likely you need to set it to obtain an IP address automatically A Reboot your PC and try again 4 If the computer has two RJ 11 ports try the other port 4 Try removing and reinstalling the dial up connection If you want to disable call waiting while you re connected to the Internet enter 70 in front of the phone number CONNECT TO THE INTERNET USING ISDN ISDN is an older outdated technology and it s unlikely you ll ever be called on to set up an ISDN connection But just in case here are a few essential tips that will make your work easier EN 060 4 The phone line that is handling the ISDN connection can support one or two ISDN connections or an ISDN connection and a regular telephone call 4 The ISDN equipment consists of an ISDN modem The modem might also be able to serve double duty as a router for a small LAN A Logically the ISDN modem contains two pieces of equipment An NT1 Network Terminator 1 device interfaces between the phone company and the home or business telephone network A TA terminal adapter device interfaces with the local network In most cases both devices are contained in the modem box that uses an RJ 11 jack to connect to the telephone line and an RJ 45 jack to connect to the net
39. esktop uses Practice implementing this change by doing the following 1 Set up Remote Desktop on a computer to be the host computer Use another computer the client computer to create a Remote Desktop session to the host computer Verify the session works by transferring files in both directions 2 Next change the port that Remote Desktop uses on the host computer to a secret port Print a screen shot showing how you made the change Use the client computer to create a Remote Desktop session to the host computer using the secret port Print a screen shot showing how you made the connection using the secret port Verify the session works by transferring files in both directions 3 What secret port did you use What two Microsoft Knowledge Base Articles gave you the information you needed This page intentionally left blank
40. est will be allowed and forwarded to that computer on the network The computer is defined to the router by its static IP address For example in Figure 18 37a port 80 is open and requests to port 80 are forwarded to the Web server that is listening at that port This one com puter on the network is the only one allowed to receive requests at port 80 A Port triggering opens a port when a PC on the network initiates communication through another port For example in Figure 18 37b Computer C sends data to port 50 to a computer on the Internet The router is configured to open port 80 for Local Network Web server Computer B Computer C j a Port filtering and port forwarding Local Network Web server pr Computer B omputer C b Port triggering Figure 18 37 Port filtering port forwarding and port triggering Courtesy Course Technology Cengage Learning Setting Up a SOHO Network 949 communication from this remote computer Port 80 is closed until this trigger occurs Port triggering does not require a static IP address for the computer inside the network and any computer can initiate port triggering The router will leave port 80 open for a time If no more data is received from port 50 then it closes port 80 The A 220 702 Practical Application exam expects you to know how to implement port forwarding and port triggering To configure port forwarding or port triggering use the Appli
41. et it up for first use HOW REMOTE DESKTOP WORKS Follow these steps to use Remote Desktop 1 For Vista click Start All Programs Accessories and Remote Desktop Connection For XP click Start All Programs Accessories Communications and Remote Desktop Connection After Service Pack 3 is applied to Windows XP the location of Remote Desktop on the Start menu might change to Start All Programs Accessories The Remote Desktop Connection window opens see Figure 18 55 du Aaoi Destra Caacectisn o Bu Remote Deskto E Connection Mie me re Road Tou mille y Dee he py Se Come jme Lom ve J Figure 18 55 Enter the IP address of the remote computer to which you want to connect Courtesy Course Technology Cengage Learning EN OO J gt N N P l N 962 CHAPTER 18 Networking Practices 2 Enter the IP address or the host name of the computer to which you want to connect Begin the host name with two backslashes as in WVistaFileServer iif To use the host name when making a Remote Desktop connection on a local net work the host name and IP address of the remote computer must be entered in the Hosts file of the local computer 3 If you plan to transfer files from one computer to the other click Options and then click the Local Resources tab shown in the left side of Figure 18 56 Click More The box on the right side of Figure 18 56 appears Check Drives Click OK Click Conne
42. f the connection gives problems try removing the splitter Follow these directions if you are using a USB cable to connect your cable modem to your computer 1 When using a USB port on your PC first read the directions that came with your cable modem to find out if you should install the software before or after you connect the cable modem For most installations you begin by connecting the cable modem 2 Connect the USB cable to your PC and to the cable modem Plug in and turn on the cable modem and Windows will automatically detect it as a new USB device When the Found New Hardware Wizard launches see Figure 18 5 click Locate and install driver software respond to the UAC box and insert the USB driver CD that came with your cable modem The wizard searches for and installs these drivers Wingiews seeds to inctall deer seirware bor your USA Cah owen Locate aod install dimer softeare recommended Airis mol deerit pir e Hur pretest ol repeats aerate oleae Pes pee divin Ask me again lee Tische udi iih jien Thee eae Bui pete og nA oed Cet Ra eg am Dont thow the menage again bor this dece Fir Gee eel te byes eee pe lE i eee Figure 18 5 When using a USB cable to connect to the cable modem the Found New Hardware Wizard will install the cable modem drivers Courtesy Course Technology Cengage Learning 3 You can now pick up with Step 4 above to configure the Vista or XP connection After the connection is con
43. figured in Windows you are ready to activate your service and test the connection Do the following 1 The cable company must know the MAC address of the cable modem you have installed If you have received the cable modem from your cable company the company already has the MAC address listed as belonging to you and you can skip this step If you purchased the cable modem from another source look for the MAC address somewhere on the back or bottom of the cable modem See Figure 18 6 Contact the cable company and tell them the new MAC address EN 060 J gt N N m l e N 924 CHAPTER 18 Networking Practices Figure 18 6 Look for the MAC address of the cable modem printed on the modem Courtesy Course Technology Cengage Learning 2 Test the Internet connection using your Web browser If you are not connected try the following a For Vista open the Network and Sharing Center window and select Diagnose and repair under Tasks This will walk you through a few basic steps to try to resolve the issue For XP in the Network Connections window select the network connec tion and then click Repair this connection b If this doesn t work turn off the PC and the cable modem Wait a full five minutes until all connections have timed out at the cable company Turn on the cable modem and wait for the lights on the front of the modem to settle in Then turn on the PC After the PC boots up again check for connectivity c Iry
44. followed by ipconfig renew Vista requires an elevated command prompt window 2 Look for problems with the TCP IP configuration Enter ipconfig all at the command prompt If the TCP IP configuration is correct and an IP address is assigned then the IP address subnet mask and default gateway appear along with the MAC address For dynamic IP addressing if the PC cannot reach the DHCP server then it assigns itself an Automatic Private IP Address APIPA The ipconfig command shows the IP address as the Autoconfiguration IPv4 Address and the address begins with 169 254 see Figure 18 68 In this case suspect that the PC is not able to reach the network or the DHCP server is down Autoconfigured IP address Figure 18 68 The network connection was not able to lease an IP address Courtesy Course Technology Cengage Learning 3 Next try the loopback address test At a command prompt enter the command ping 127 0 0 1 with no period after the final 1 This IP address always refers to your local computer It should respond with a reply message from your computer If this works TCP IP is likely to be configured correctly If you get an error then assume that the problem is on your PC Recheck the installation and configuration of each component such as the network card and the TCP IP settings Remove and reinstall each compo nent and watch for error messages writing them down so that you can recognize or research them later as necessar
45. ge you re pretty much without a phone However incoming calls are still directed through the auto attendant and messages are saved there until you again have access Overall even with these drawbacks VoIP was the right choice for our company We re pleased with the features and are willing to tolerate the growing pains as technology catches up with our needs When setting up a VoIP system know that each digital phone or ATA must be programmed with a phone number from the VoIP provider Each device is also programmed to use dynamic IP addressing and must be assigned an IP address just like any other device on the network which means your network must be using a DHCP server such as one provided by a multipurpose router Plug up the devices to the network and then configure the VoIP service using the Web site of the VoIP provider Because electrical interference can be a problem with VoIP phones each network cable connected to a VoIP phone needs a ferrite clamp see Figure 18 78 attached Attach the Clamp not yet installed Clamp installed Figure 18 78 Install a ferrite clamp on a network cable to protect against electrical interference Courtesy Course Technology Cengage Learning 201 022 Y E 984 CHAPTER 18 Networking Practices clamp on the cable near the phone port This clamp helps to eliminate electromagnetic inter ference EMI Some cables come with preinstalled clamps and you can also buy ferrite clamps to attach
46. h a remote computer when high security is needed Using SSH Secure Shell client software you can communicate with a remote computer and transfer files using a secure tunneling connection Also an SSH version of FTP called Secure FTP or SFTP can be used to make these types of connections secure Windows does not contain an SSH client or server application so third party software must be used Do the following if you are hav ing a problem making an SSH connection 4 Verify that port forwarding is enabled on your router SSH uses port 22 4 Using Windows Firewall add port 22 to your exceptions list and allow exceptions 4 Using the IP address of the SSH server ping the server to verify connectivity 4 Verify that you have the correct permissions on the remote SSH server 4 Check the Web site of the SSH software for other troubleshooting tips E MAIL CONNECTIONS Problems with e mail connections are likely caused by wrong client settings Follow these steps to verify these critical settings 4 Check the Web site of the ISP or other group that is managing the e mail and find out the names of the outgoing and incoming e mail servers and the protocols being used Troubleshooting Network and Internet Connections 979 4 In the e mail client software look for a way to view and change the incoming and outgoing mail servers For example in Figure 18 72 the incoming receive e mail server is pop windstream net and the outgoing send e mail se
47. h as the one shown in Figure 18 75 into a network port on a local network that is connected to the Internet and use that phone to make a phone call to anywhere on the planet Notice in the figure the power cord and network cable share a common cable and connector to the phone You can also use a regular analog phone as an Internet phone if you use an Analog Telephone Adapter ATA such as the one shown in Figure 18 76 Plug the phone into the ATA which uses a network cable to connect to the network Just as with mobile phones the digital phone or ATA is programmed for a particular phone number Figure 18 75 This digital telephone has a network port to connect to a network Courtesy Course Technology Cengage Learning Figure 18 76 Use this ATA to turn an analog telephone into an Internet phone Courtesy Course Technology Cengage Learning AC adapter supplies power to the phone RJ 45 connector RJ 45 connector to network Phone jack for regular analog telephone EN OO gt N N P l N daughter Jill West was responsible for selecting a telephone system for a small business I asked her to describe the successes and woes of having chosen a VoIP solution Here is her story We planned our company so that we all can work from our home offices and live in several regions of the country yet we compete in a market where we must present a unified front More and more busi nesses are built this way thes
48. ialog box opens see Figure 18 24 No matter what type of network you are connected to Windows Firewall should always be turned on unless you are using a third party software firewall instead of Windows Firewall 936 CHAPTER 18 Networking Practices Network profiles Sharing and Discovery settings turned off Dus rua liia Higg amd pm anm py Figure 18 21 Security is high when connected to a public network Courtesy Course Technology Cengage Learning Leoendge M Full Deer gl pibur iere di hocce ep rd ded LUIL IB dod f fid d Lu Cosma peur carm desc ms gai Sg cese A teen ees Figure 18 22 Change the security settings for a network Courtesy Course Technology Cengage Learning Connecting to the Internet i Kips i de ee LI hime m ieie Pr po Se ees Pets M es ee i ied ie DEL ER re bs pih h ei Pa ji ha hie a E a e F T E O Leman mery ee eee ee ey arai ee am ee ey ee eS eg nm pon 1 cM Pq e oF Figure 18 23 Change the setting of an item under the Sharing and Discovery group Courtesy Course Technology Cengage Learning hn wed pap a pe ERI L TL dM rare all aos ane nap Pe Sa cb Wd Cag ee eC No hum iu Vidi Ee Hn ii a SPA Se DELE HOME Figure 18 24 Windows Firewall is turned on Courtesy Course Technology Cengage Learning 937 EN OO gt N N P l N 938 CHAPTER 18 Networking Practices 2 To see the details of h
49. ile reverse lookup File Transfer Protocol FTP public profile VoIP Voice over Internet port filtering Quality of Service QoS Protocol port forwarding Remote Assistance C mU D 2 BT ox d Eee e 10 Give two popular examples of broadband technology Which type of broadband connection does Windows assume on demand or always up What is the purpose of DSL filters on phone jacks in your home Which type profile that Vista assigns to a network connection offers the least security What is the speed in bits per second of a 1000BaseT Ethernet network What is the maximum length of an Ethernet cable on a 100BaseT network What is the first configuration change you should make when you first install a router How is a DHCP reservation on a router used Which command is used to find the DNS server s information about a domain name Which command is used to find the host name of a computer when you know its IP address Which command can give you the hop count from your computer to another What parameter can be added to the Netstat command so that you can see what program is responsible for a network connection Which editions of Windows can be used to serve up Remote Desktop Which is the easiest way to initiate a Remote Assistance session What is the listening port for Windows XP Remote Desktop Which tool Remote Desktop or Remote Assistance allows you to set up a chat session with the user In what folder i
50. ility of the access point to disable SSID broadcasting Courtesy Course Technology Cengage Learning SSID not broadcasted t4 wl Cesc ik Lee of 1 Figure 18 43 A wireless computer shows it has located three access points but the first one listed is not broadcasting its SSID Courtesy Course Technology Cengage Learning Setting Up a SOHO Network 953 Tee me iter name SS bar Te eee lh 15 lE E EP ap XL E REIN LL bem P lum Figure 18 44 Enter the SSID of a wireless network that is not broadcasting its SSID Courtesy Course Technology Cengage Learning 2 To configure data encryption on your access point look for a wireless security screen similar to the one in Figure 18 45 where you can choose between several WEP WPA or RADIUS encryption methods RADIUS stands for Remote Authentication Dial In User Service and uses an authentication server to control access WPA2 Personal is the one to choose unless one of your wireless adapters doesn t support it Enter the passphrase for encryption on this same access point screen When you connect a PC to this network you ll need to enter the same passphrase To make the strongest password or passphrase use a random group of numbers uppercase and lowercase letters and if allowed at least one symbol Also use at least eight characters in the password 3 Look for MAC filtering on you
51. ing Practices CONNECTING TO THE INTERNET In this part of the chapter you ll learn how to connect a single PC to the Internet and then how to use Windows Firewall to protect that connection Later in the chapter you ll learn how to use a router to create a more sophisticated and secure Internet connection that can support multiple computers all accessing the Internet You need to know how to connect to the Internet when using cable modem DSL satellite dial up and ISDN connections All these types of connections are covered in the following sections The A 220 702 Practical Application exam expects you to know how to connect to the Internet when using a DSL cable modem satellite ISDN or dial up connection Generally when setting up a cable modem or DSL connection to the Internet the installa tion goes like this 1 Connect the PC to the cable modem or DSL box Connect the cable modem to the TV jack or the DSL box to the phone Jack Plug in the power and turn on the broadband device 2 Configure the TCP IP settings for the connection to the ISP 3 Test the connection by using a browser to surf the Web Now let s look at the specific details of making a cable modem connection or DSL connection to the Internet CONNECT TO THE INTERNET USING CABLE MODEM To set up a cable modem installation to the Internet you ll need the following Internet service provided by your cable modem company A computer with an avail
52. l jacks that use RJ 45 ports If network cables are lying on the floor be sure to install them against the wall so they won t be a trip hazard Take care that cables don t exceed the recommended length Recall from Chapter 17 that 10BaseT 100BaseT and 1000BaseT Ethernet networks also called Ethernet Fast Ethernet and Gigabit Ethernet can use UTP or STP cables no longer than 100 meters 328 feet For Fast Ethernet or Gigabit Ethernet always use twisted pair cables rated at CATSe or higher To connect multiple computers use switches rated at the same speed as your router and network adapters For best results buy Gigabit switches and network adapters a Gigabit router and CAT6 cables However if some devices run at slower speeds most likely a switch or router can still support the higher speeds for other devices on the network If your router is also your wireless access point take care in planning where to place it Place the wireless access point near the center of the area where you want your wireless network The router also needs to have access to your cable modem DSL modem or whatever device that provides Internet access That device needs access to the cable TV or phone jack where it receives service Figure 18 28 shows a possible inexpensive wiring Job where two switches and a router are used to wire two rooms for five workstations and a network printer The only inside wall wiring that is required is two back to back RJ 45 wall j
53. lace the router 9 If you still cannot access the Internet contact your ISP PROBLEMS WITH CLIENT SIDE APPLICATIONS Problems with client side applications might be caused by router or firewall settings secured connections not working e mail protocol settings FTP problems and VoIP connections All these concerns are covered next ROUTER AND FIREWALL SETTINGS When trying to use client server applications on the Internet your software and hardware firewalls and other security settings on the router must allow the communication 976 CHAPTER 18 Networking Practices Open Windows Firewall on the local computer and verify these settings 1 Following instructions given earlier in the chapter verify Windows Firewall settings Make sure Vista Windows Firewall is on and that Block all incoming connections is not checked For XP verify that Don t allow exceptions is not checked 2 Click the Exceptions tab and make sure the service or program you are trying to use is checked If you don t see your service or program listed click Add program refer back to Figure 18 26 select the program from the list of installed programs and click OK If you know the specific port you want to open click Add port refer back to Figure 18 26 and enter any name to help you remember the purpose of this port the port and protocol TPC or UDP on the Add a Port box Click OK to close the box If the problem is still not solved follow these steps
54. lient application that is not working PROBLEMS WITH HARDWARE AND DEVICE DRIVERS When a PC cannot communicate on a network begin by checking hardware To verify network hardware and solve problems with hardware follow these steps 1 Check the status indicator lights on the NIC or the motherboard Ethernet port A steady light indicates connectivity and a blinking light indicates activity If you don t see either light this problem must be resolved before you consider OS or application problems Troubleshooting Network and Internet Connections 971 2 Check the network cable connection at both ends Is the cable connected to a port on the motherboard that is disabled It might need to be connected to the network port provided by a network card Check the indicator lights on the router or switch at the other end Try a different port on the device 3 For wireless networking make sure the wireless switch on a laptop is turned on Move the laptop to a new position in the hotspot Rebooting a laptop often solves the prob lem of not receiving a signal 4 Determine whether other computers on the network are having trouble with their connections If the entire network is down the problem is not isolated to the PC you are working on Check the switch hub or router controlling the network 5 Check the network cable to make sure it is not damaged If the cable is frayed twisted or damaged replace it You can also use cable tester
55. lities for Supporting and Troubleshooting Networks 959 Sorry Bud that s the end of the line for l you but lIl send an ICMP messenger back I m going to to your host 168 30 45 6 My TTLis 1 Network A Ethernet Network B Figure 18 51 A router eliminates a packet that has exceeded its TTL Courtesy Course Technology Cengage Learning Net pause Net print Net session Net share Net start Net statistics Net stop Net time Net use Net user and Net view For example the Net use command can make a connection to a remote computer break a connection or display information about all network connections Figure 18 52 shows three Net use commands Here is an explanation of how these commands work 1 The first command net use displays current network connections You can see that a connection to Vistafileserver Data2 was attempted in order to create a network drive map to drive J A network drive map makes a folder or volume on a remote com puter appear as a local drive such as J The command to map the drive completed but the server was not available 2 The second command net use Vistafileserver Data2 made an attempt to connect to the same resource 3 The third command net use shows the connection to Vistafileserver Data2 is good You ll learn to use other variations of the Net command later in the chapter under Problems with TCP IP the OS and ISP Connectivity ge remind Prnt T aiis E
56. n file Click Finish 968 CHAPTER 18 Networking Practices Chor a way to omeect to the other TAF S Oe Emir ge maleic dde foc UTETE rose T4 a Ea pla qr ieu re Biei ee She pA phi mie Fa dr Tipe i Domn n ar F E Tia Odes tl ubi thy Dy WC daa Carey i T ubi We Spidi MEg ees reor core Be toshganed 0S acewor Racket Acperanop emis Fei d 5TH m T Di Iss II HEDUH Figure 18 64 Point to the location of the invitation file Courtesy Course Technology Cengage Learning 2 On the next box enter the password given you by the user Click OK 3 The user sees the box in Figure 18 65 appear on her desktop She must click Yes to allow you to connect Aib Flee Roi ti u Would jane like Bo alos HII Wea bes aonne To your compuber Ale penp beg LOU sdb ba abs to obs iuam p EC Low db mm d pTHE deir up ptor gg Hsu tant Figure 18 65 The user gives Jill West permission to connect Courtesy Course Technology Cengage Learning 4 The background of the user s desktop turns black A window on your desktop opens where you can see the user s desktop see Figure 18 66 Here are some things you and the user can do so that you can assist the user A To open a chat session with the user click the Chat icon A chat pane appears in the Remote Assistance window on both desktops A To ask the user if you can take control of her desktop click Request control in the Remo
57. n the list is associated with one or more ports which are opened or closed based on the settings on this tab After you have Windows Firewall configured the way you want it click Apply and click OK to close the Windows Firewall Settings window To view and change the Windows Firewall settings for Windows XP use the Network Connections window In the left pane click Change Windows Firewall settings The Windows Firewall window opens as shown in Figure 18 27 Verify that On recommended is selected Connecting to the Internet 939 NOMSDEORCOHIUEREE EINST soe eae ts Pap FS DAR roe Peas ad a fe T G ee tM ee alee d es We ences un cena uir in ait umm La Figure 18 26 Exceptions allowed for incoming connections Courtesy Course Technology Cengage Learning iem aaro ioi en a Use ee oh EN OO 9 o in fermeria COmpule Wih ha enebo Of POr Hei om te scaetors inh o Dent allow exceptions Teac fun wher ru Connect lo public ratwgrk n inm Cue KwCNDOF SUC OT Cou cw nor Dae sone wur vnde Fore ccr pega Salica on the Eci tat will ber gt N N P l N E oom Figure 18 27 Windows Firewall for Windows XP is set for maximum protection Courtesy Course Technology Cengage Learning 940 CHAPTER 18 Networking Practices If you don t want to allow any communication to be initiated from remote computers check Don t allow exceptions This is the preferred setti
58. net Explorer to leave protected mode Click Allow OBI ss Facial com Wea Lam bagi coss O5 bcd Ap hp emgage cam X am as p Um n Vin Mami Tu MC p io se AB PTE vont a Bip congage core ERER preges tec lie omi Qu M FTP root at ftp cengage com Te view this FTP sie im Widows Explorer cick Page 2 Hrt it nnd Fih by i mas paag Lad b i mad Bala uitis Iecreunit Cite Vrai E ola QZLIITEM DiPNZLZEY pg Best Lom Tat cen niri p 7 F Opan FTP aa in Meats lir p Figure 18 74 Transferring files using FTP is best done with Windows Explorer Courtesy Course Technology Cengage Learning If you are having problems using FTP do the following 4 Add ports 20 and 21 to the Exceptions list of Windows Firewall 4 Ping the FIP server to make sure you have connectivity 4 Contact the administrator of the FIP site and verify that you have the correct permissions to the site VOIP CONNECTIONS VoIP Voice over Internet Protocol also called Internet telephone provides voice commu nication over a network and uses the VoIP protocol Using VoIP voice is converted to digi tal data for transmission over the Internet and connects to the POTS Plain Old Telephone Service so that people without VoIP can make and receive calls from VoIP subscribers Troubleshooting Network and Internet Connections 981 When setting up a VoIP service you plug a digital telephone suc
59. ng can use your wireless network If they guess the default password to the router they can change the password to hijack your router Also your wireless network can be used for criminal activity When you first install a router before you do anything else change your router password and disable the wireless network until you have time to set up and test the wireless security And to give even more security change the default name to another name if the router utility allows that option 942 CHAPTER 18 Networking Practices The setup program will then step you through the process of configuring the router After you ve configured the router you might have to turn the cable modem or DSL modem off and back on so that it correctly syncs up with the router If you don t get immediate connec tivity to the Internet on all PCs try refreshing the IP address or rebooting each PC Now let s look at how a Linksys router such as the one shown in Figure 18 29 is configured The methods are typical of what you might see for several brands and models of small office or home office routers Firmware on the router which can be flashed for updates contains a configuration program that you access using a Web browser from anywhere on the network In your browser address box enter the IP address of the router for our router it s 192 168 1 1 and press Enter A logon box appears see Figure 18 30 Use the account name and password given in the ro
60. ng when you re traveling or using public networks or Internet connections If you are on a local network and need to allow others on the network to access your computer uncheck Don t allow exceptions Then click the Exceptions tab to select the exceptions to allow For example if you want to share files and folders on your local network use the Exceptions tab to allow File and Printer Sharing activity Later in the chapter you ll learn how to use the Exceptions tab of Windows Firewall to allow certain client applications such as Remote Desktop access to your computer SETTING UP A SOHO NETWORK A PC support technician is likely to be called on to set up a small office or home office network To set up this network you need to know how to physically connect computers to a network and how to install and configure a multipurpose router to stand between the network and the Internet And finally you need to know how to set up and secure a wireless access point All these skills are covered in this part of the chapter PHYSICALLY CONFIGURE A SMALL NETWORK To set up a small network you ll need computers switches network cables a router and whatever device for example a DSL or cable modem that provides Internet access Recall from the last chapter that a switch is used to connect two or more computers by way of Ethernet patch cables also called network cables Some network cables might be wired inside walls of your building with wal
61. nstall the adapter and run this setup program 4 Some network adapters have diagnostic programs on the installation CD Try running the program from the CD Look in the documentation that came with the adapter for instructions on how to install and run the program J gt N N P l e N 5 For an onboard network port update or reinstall drivers provided by the motherboard driver CD or the motherboard Web site manufacturer 6 If Device Manager still reports errors try running antivirus software and updating Windows Then try installing a known good network adapter If that does not work the problem might be a corrupted Windows installation After you have verified the status indicator lights on the NIC and Device Manager recog nizes the NIC with no errors move on to the next step of checking TCP IP settings 972 CHAPTER 18 Networking Practices PROBLEMS WITH TCP IP THE OS AND ISP CONNECTIVITY To solve problems with Windows TCP IP configuration and connectivity follow these steps to verify that the local computer is communicating over the network 1 Iry to release the current IP address and lease a new address To do this using Vista open the Network and Sharing Center window and click Diagnose and repair For XP in the Network Connections window right click the network icon and select Repair from the shortcut window Alternately you can open a command prompt window and use these two commands ipconfig release
62. onfigure a wireless network including how to implement wireless security You need to know how to configure WEP WPA SSID MAC filtering and DHCP settings To install a stand alone access point position it in the center of where you want your hotspot and plug it in It will have a network port to connect to a wired network or a USB port to connect to a computer Using one of these ports connect the access point to a computer so that you can configure the access point If the access point is bundled with a setup CD run the setup program to step you though the installation To configure the access point open a browser and enter the IP address of the access point Firmware on the device displays the configuration utility Using this utility look for ways to change these settings 1 Look for a way to select the channel the access point will use the ability to change the SSID of the access point and the ability to disable SSID broadcasting Figure 18 42 shows these three settings for a multipurpose Linksys access point Figure 18 43 shows how a wireless computer sees a wireless access point that is not broadcasting its SSID This computer would not be able to use this access point until you entered the SSID in the configuration window shown in Figure 18 44 EN 060 J gt N N P l e N 952 CHAPTER 18 Networking Practices dh tort ee PP LEM i rudi Figure 18 42 Look for the ab
63. onstantly plagued with pop up ads and worms so Santiago has come to you for some advice He s heard he needs to use a firewall but he doesn t know what a firewall is or how to buy one You immediately show him how to turn on Windows Firewall on both Vista PCs but you know he really needs a better hardware solution What equipment including cables do you recommend he buy to implement a hardware firewall Also consider that his daughter Sophia has been begging for a notebook computer for her birthday so plan for this expansion By the way Sophia has made it perfectly clear there s no way she ll settle for having to sit down in the same room with her parents to surf the Web so you need to plan for a wireless connection to Sophia s bedroom Real Problems Real Solutions 989 REAL PROBLEM 18 2 More Security for Remote Desktop When Jacob travels on company business he finds it s a great help to be able to access his office computer from anywhere on the road using Remote Desktop However he wants to make sure his office computer as well as the entire corporate network is as safe as possible One way you can help Jacob add more security is to change the port that Remote Desktop uses Knowledgeable hackers know that Remote Desktop uses port 3389 but if you change this port to a secret port hackers are less likely to find the open port Search the Microsoft Knowledge Base articles support microsoft com for a way to change the port that Remote D
64. or your router model and verify the firmware version is higher than the version already installed If the router offers the option back up the current firmware before you start the update Next to update the router firmware using the down loaded file click the Administration tab and then click Firmware Upgrade On the Firmware Upgrade window see Figure 18 34 click Browse and point to the down loaded file Then click Upgrade to begin the update Don t disturb the router until the update has completed J gt N N P l N CONFIGURE THE HARDWARE FIREWALL To configure the hardware firewall router feature you need to do the following 4 In the window shown in Figure 18 31 click the Security link The window shown in Figure 18 35 appears The most important setting on this window is to enable SPI Firewall Protection SPI stateful packet inspection examines each data packet and rejects those unsolicited by the local network Enabling this feature prevents your net work from being detected or accessed without an invitation by others on the Internet 946 CHAPTER 18 Networking Practices ur Fem ge A uppa s ont there Adem filemon ingens B am rages Sales Tenn die LINKSYS by Cisco Acdministration Ps ded d Um CS ah Ee Ren Ure i Cu ag gee dee carp Cae 4 om i Sie Bet a TT ew Pee cu eed Se eet be Upgrade meat HOT be iimarugne EE soe n Figure 18 34 Upgrade the router firmwar
65. ort forwarding to it Actually no so take this into account when you decide to use Remote Desktop In a project at the end of this chapter you ll learn how you can take further steps to protect the security of your computer when using Remote Desktop REMOTE ASSISTANCE Remote Assistance can help you support users and their computers from a distance The user who needs your help sends you an invitation by e mail or chat to connect to her computer using Remote Assistance When you respond to the invitation you can see the user s desktop just as she sees it And if the user gives you permission you can take control of her computer 966 CHAPTER 18 Networking Practices to change settings or do whatever else is needed to fix her problem or show her how to per form a task Think of Remote Assistance as a way to provide virtual desk side support The A 220 702 Practical Application exam expects you to know how to use Remote Assistance There are several ways to initiate a Remote Assistance session A The user saves an invitation file and then sends that file to the technician The file can be sent by any method including e mail chat or posting to a shared folder on the network This is the easiest method to start a Remote Assistance session A The user can initiate a session by way of Windows Messenger This method works well when the user is behind a hardware firewall that the technician must get past A The user can send an
66. ow Windows Firewall is working click Change settings and respond to the UAC box The Windows Firewall Settings box opens see Figure 18 25 Rn hepa Setere rg Fersad ces hep grecenz teary cr melons meters bo gag l EOE E p Ge Supe Vw biei pei 2 a Wem Tamen rorem i Tras aa cun ics ee Qe Som eee ca fw CHMULDP peepee fee Tu SUBESCLAC ac fu ee tac M cU X S Inn facwe Tad oe meh aim Gee H a dab rd cao dde tal TMA reel errem net eg nia ee Tg eect Fu geil ll maie rug Se ee ee D ee Oe Enli ma ee eters en tert Figure 18 25 Windows Firewall is on but not working at its highest security level Courtesy Course Technology Cengage Learning 3 Notice the check box for Block all incoming connections which controls communication initiated from another computer For a private network Vista does not check this box When connected to a public network the box is checked To see what incoming connections are allowed click the Exceptions tab see Figure 18 26 4 Notice in Figure 18 26 that File and Printer Sharing is checked This means that another computer can initiate communication with this computer to access a shared file or printer You can change individual settings on this Exceptions tab by checking or unchecking items Recall from Chapter 17 that a computer uses a port number to control incoming activity from client applications or programs on the network This Exceptions box controls these ports Each item i
67. own in Figure 18 8 If necessary you can use a Y splitter on the wall jack as shown in Figure 18 8 so that a telephone can use the same jack Be sure to add a filter between the splitter and the telephone the filter also appears in the diagram On the other hand you can use a filter such as that shown in Figure 18 7 that can plug directly into the wall jack and serve both a telephone and the DSL modem Plug the DSL modem into the DSL port on a filter or directly into a wall jack Don t connect the DSL modem to a telephone port on the filter this setup would prevent DSL from working Plug in the power to the DSL modem Connect a network cable or USB cable between the DSL modem and the PC EN OO To telephone Telephone filter Y splitter J gt N N P l e N DSL modem Figure 18 8 Sample setup for DSL Courtesy Course Technology Cengage Learning 926 CHAPTER 18 Networking Practices 4 Follow the steps given earlier to use Vista or XP to configure the DSL connection which works the same way as with cable modem 5 Open your browser and surf the Web to test the connection 6 If you did not receive the DSL modem from the telephone company you might need to call the DSL help desk and give them the MAC address of the modem and have them reset the connection on their end If your DSL connection requires a user name and password or static IP addressing see the next section on how to configure
68. p eee A Mares distineo drame the c A wp b ete lie icem n p ete fk Le as p ee ee ee Han ari ar t s Lae ui ee rn CE PE E nera ER LSE WuRENODR podia p a ey Figure 18 10 Select the type of network you want to set up Courtesy Course Technology Cengage Learning An on demand broadband connection that is not always up requires that a user name and password be authenticated at the ISP each time you make the connection The logon is managed by a protocol called PPPoE Point to Point Protocol over Ethernet which is why the connection is sometimes called a PPPoE connection 4 If the computer has other network connections that are not currently active the screen in Figure 18 11 appears Select No create a new connection and click Next EN OO Da ou sant En sis a connectun Pat you already have db Mn nada dm Ceca Ga E aana oe eatery iint gt N N m e E J O N Figure 18 11 Choose the option to create a new network connection Courtesy Course Technology Cengage Learning CHAPTER 18 Networking Practices 5 On the next screen shown in Figure 18 12 click Broadband PPPoE ory do ymu wani Bre Cornet t Wineleqs Lares aii ib H e iol miii reifen ip lBredband PPEISET Dg DUE a a Hand ee Po iul g ou Capra ward d ded ig ricum ea phi Figure 18 12 Choose to create a broadband connection Courtesy Course Technology Cengage Learning
69. r access point similar to the screen in Figure 18 46 On this access point you can enter a table of MAC addresses and decide if this list of MAC addresses is to be used to prevent or permit use of the access point 4 Decide if your access point will serve up IP addresses dynamic IP addressing or if computers that connect to the access point will use static IP addresses Dynamic IP address ing is the likely choice To set that up enable DHCP and set the number of IP addresses that can be used at any one time which limits the number of computers that can use the wireless network Also set the beginning IP address The best choice is to begin with an IP address in the range of 192 168 x x so that your network will use private IP addresses If you want to use static IP addressing on the wireless network then disable DHCP 5 Save all your settings for the access point and test the connection To test it on one of your wireless computers follow directions given in Chapter 17 to connect to a hotspot entering the passphrase when requested If you don t see the network in the list of wireless networks try moving your access point or the computer If you still can t get a connection remove all security measures and try again Then restore the security features one at a time until you discover the one causing the problem 954 CHAPTER 18 Networking Practices t E LIES IE ee Tirim BH iauuahn Finn
70. r site is not being blocked 5 To verify that the router is not the problem with communication you can connect a PC directly to the cable modem DSL box or other device so that the router is not involved However realize you re partially dropping your shields when you do so First make sure that Windows Firewall and antivirus software is set for maximum protection and don t leave the hardware firewall router out of the loop any longer than you need in order to solve the problem Sometimes security settings at your ISP might be a problem For example if you re trying to play an Internet game you might need to contact your ISP and ask them to open a port that you need to play the game Troubleshooting Network and Internet Connections 977 PROXY SERVER CONNECTIONS Many large corporations and ISPs use proxy servers to speed up Internet access A proxy server is a computer that intercepts requests that a client makes of a server It caches the Web pages and files that are requested If another client requests the same content the proxy server can provide the content that it has cached When the proxy server needs to request content from a server it substitutes its own IP address for the request in the same way that NAT works In addition proxy servers sometimes act as a gateway to the Internet a firewall to protect the network and to restrict Internet access by employees to force employees to follow company policies A Web browser does no
71. rs on the network from malicious activity coming from the Internet In this part of the chapter you ll learn to use a software firewall Later in the chapter you ll learn how to set up a hardware firewall A hardware or software firewall can function in several ways A Firewalls can filter data packets examining the destination IP address or source IP address or the type of protocol used for example TCP or UDP A Firewalls can filter ports so that outside client applications or programs cannot communicate with inside services listening at these ports Certain ports can be opened for example when your network has a Web server and you want Internet users to be able to access it A Firewalls can block certain activity that is initiated from inside the network such as preventing users behind the firewall from using applications like FTP over the Internet When evaluating firewall software look for its ability to control traffic coming from both outside and inside the network 4 Some firewalls can filter information such as inappropriate Web content for children or employees and can limit the use of the Internet to certain days or times of the day Some examples of firewall software are ZoneAlarm see Figure 18 20 by Check Point Software www zonealarm com Firewall Software Blade by Check Point Software www checkpoint com and Windows Firewall In addition Norton 360 by Symantec www symantec com and McAfee VirusScan Plus by McAfee ww
72. rve up to 50 leased IP addresses beginning with IP address 192 168 1 100 You can also disable the DHCP server if you want to use static IP addressing on your network or you already have another DHCP server on the network 4 One or more computers on your network might require a static IP address For example in the last chapter you learned how to set up and use a Telnet server Recall that you could access the server from another computer by using the host name of the Setting Up a SOHO Network 945 BB isi betes Boeebes hiren eee e Qe ELT WM o i ol oe K pm iaa i res Herit Ten Hag Figure 18 33 Configure the router for static IP addressing Courtesy Course Technology Cengage Learning server The host name was associated to the server s IP address by making an entry in the Hosts file on the local computer To make this entry always work the Telnet server needs a static IP address To set the router to serve up this same IP address to the Telnet server each time it connects to the network click DHCP Reservation in Figure 18 31 You will then be able to enter a reserved IP address and the MAC address of the computer Telnet server in our example that is to receive this reserved IP address 4 If you have problems with the router or decide to keep firmware updates current these updates can be downloaded and installed First download the upgrade file from the Web site of the router manufacturer Be sure to download the correct file f
73. rver is smtpauth windstream net The outgoing server is using the SMTP AUTH protocol 4 Verify the correct protocol is being used for incoming mail Options are POP and IMAP see Figure 18 73 Figure 18 72 Verify the correct e mail servers are being used Courtesy Course Technology Cengage Learning EN OO gt N N P l N Figure 18 73 Verify the incoming e mail protocol Courtesy Course Technology Cengage Learning 980 CHAPTER 18 Networking Practices FTP CONNECTIONS The most popular way to transfer files over the Internet is to use the File Transfer Protocol FIP which can transfer files between two computers using the same or different operating systems Many software vendors use FIP sites for downloading software to their customers When you click a link on a Web site to download a file if the protocol in your browser address box changes from http to ftp then you are using FIP for the download You can also access an FIP site directly by entering a URL that begins with ftp such as ftp cengage com If the site allows anonymous login you will see a root level folder If the site requires a login a login box appears for you to enter a user account and password Then the root level folder appears To change the client application from Internet Explorer to Windows Explorer on the Page menu click Open FTP Site in Windows Explorer see Figure 18 74 For Vista a warning box appears asking permission to allow Inter
74. s a log of a Remote Assistance session kept How can you physically tell if a network card is not working To know if Windows recognizes a NIC without errors which tool do you use What is the full command line to use Ipconfig to release the current IP address What is the full command line for the loopback address test What key do you press to refresh the Network window What command can tell you if two computers on the same network have the same computer name What command lists the shared resources on a remote computer on the network 986 25 26 27 28 29 30 CHAPTER 18 Networking Practices Which type of Net command can be used to map a network drive Which command tests for connectivity between two computers List the steps to recycle the connection to an ISP when using a cable modem and router If you want to allow an exception in Windows Firewall through a certain port but the port or program is not listed under the Exceptions tab what can you do When an ISP gives a user the two mail server addresses smtp myISP net and pop myISP net which address should be used for incoming mail and which should be used for outgoing mail What device is required so that you can connect a regular telephone to a VoIP network 1 You are trying to connect to the Internet using a Windows XP dial up connection You installed a modem card and tested it so you know it works Next you create a dial up conne
75. s and respond to the UAC box The System Properties box appears see the left side of Figure 18 59 Click the Remote tab and check Allow connections from computers running any version of Remote Desktop less secure A dialog box might appear warning that the computer is set to go into sleep mode when not in use see the right side of Figure 18 59 Click OK to close the box Dpue uma neres kiyesi Symes renen Sarre DLL er G P add LM ILI hk ge cree dh Pale dco uon cm ic oet d nap Trai Ore ap gut un fc a aen um rf m adversns v yr anaiag ap ay qmm To cage fa mom a pri Diri P pidi gi B Mee ppa em oap AE rh y uarios oF mipi cai n Saec Umm ETN Figure 18 59 Configure a computer to run the Remote Desktop service Courtesy Course Technology Cengage Learning 2 Click Select Users In the dialog box that opens see Figure 18 60 add the users of this computer who will be using Remote Desktop Users who have administrative privileges will be allowed to use Remote Desktop by default but other users need to be added Click OK twice to exit both windows Tools and Utilities for Supporting and Troubleshooting Networks 965 Ramata Desitap Uran Tow caen lined sic car corset i5 Pp compete dered amy caes of FI Te Coie curar air sce or dad uban ia dhe groupe ge Come Pai pud ce Dn I rn Figure 18 60 Add local users who are allowed acce
76. s to verify the cable is good 6 When using an Ethernet wall Jack to connect the PC to a router or switch in another location in the building consider that the network cabling in the walls might be bad or not connected to the router or switch at the other end Disconnect the cable at the wall jack near your PC and disconnect the cable at the router or switch Next use cable testers at both these ends to verify connectivity between the wall jack and the cable near the router or switch The A 220 702 Practical Application exam expects you to know how and when to use cable testers 7 Open the computer case and make sure the NIC is securely seated in the expansion slot Try reseating the card Reboot and check for activity lights If you still don t see activity replace the NIC and then install new drivers To solve problems with device drivers which might also be related to a problem with the NIC follow these steps 1 Make sure the network adapter and its drivers are installed by checking for the adapter in Device Manager Device Manager should report the device is working with no problems 2 Try updating the device drivers EN 060 3 Try uninstalling and reinstalling the network adapter drivers If the drivers still install with errors try downloading new drivers from the Web site of the network card manufacturer Also look on the installation CD that came bundled with the adapter for a setup program If you find one uni
77. sing a broadband connection that requires a user name and password Follow the wizard through to complete the on demand setup If your broadband subscription is not always up and requires you to enter your username and password each time you connect using a router with auto connecting ability can be a great help It can automatically pass the username and password to your broadband provider without your involvement The router can also be set to auto refresh a connection before it expires Follow these steps to configure a network connection for static IP addressing 1 In the Vista Network and Sharing Center window click Manage network connections The Network Connections window appears showing each network the computer has set up see Figure 18 15 The broadband connection icon will have whatever name you gave it the default name is Broadband Connection as shown in the figure Right click Broadband Connection select Properties from the shortcut menu and respond to the UAC box The Broadband Connection Properties box appears 2 Select the Networking tab which is shown in the left side of Figure 18 16 On this tab select Internet Protocol Version 4 TCP IPv4 and click Properties The properties box appears as shown on the right side of Figure 18 16 3 For static IP addressing select Use the following IP address and enter the IP address subnet mask and default gateway given to you by your ISP Then enter the IP addresses giv
78. ss by way of Remote Desktop Courtesy Course Technology Cengage Learning 3 Verify that Windows Firewall is set to allow Remote Desktop activity to this computer To do that open the Network and Sharing Center and click Windows Firewall Then click Change settings and respond to the UAC box The Windows Firewall Settings box opens On the General tab verify that Windows Firewall is turned on and that Block all incoming connections is not selected Then click the Exceptions tab and verify that Remote Desktop is checked so that Remote Desktop incoming activity is allowed Close all windows 4 You are now ready to test Remote Desktop using your local network Iry to use Remote Desktop from another computer somewhere on your local network Verify you have Remote Desktop working on your local network before you move on to the next step of testing the Remote Desktop connection from the Internet 5 If you want Remote Desktop available at all times use the Power Options window in Control Panel to allow the computer to wake up when it has network activity How to manage power options is covered in Chapter 21 EN OO Even though Windows normally allows more than one user to be logged on at the same time this is not the case with Remote Desktop When a Remote Desktop session is opened all local users are logged off Is your computer as safe as it was before you set it to serve up Remote Desktop and J gt N N P l e N enabled p
79. steps 1 Click Start right click Network and select Properties from the shortcut menu The Network and Sharing Center window opens 2 For the window showing in Figure 18 21 the PC is connected to a wired and wireless network The wired network is set to Private and the wireless network is set to Public Because the PC is connected to a public network the Sharing and Discovery settings at the bottom of the window are turned off To change the security setting for the Public network click Customize EN OO 3 The Set Network Location box appears see Figure 18 22 To allow for less security and more communication on the network click Private and then click Next 4 Sharing and Discovery settings are now less secure allowing the PC to be seen on the network Network discovery files on the PC to be shared with others on the network File sharing and printers installed on this PC to be shared Printer sharing These are the standard settings for a private network To change a setting under the Sharing and Discovery group click the down arrow to the right of the item and turn the item on or off see Figure 18 23 In Chapter 19 you will learn to use Windows Explorer to share files and folders on the network gt N N P l N To see how Windows Firewall is configured for Vista follow these steps 1 For Vista in the left pane of the Network and Sharing Center window click Windows Firewall The Windows Firewall d
80. t have to be aware that a proxy server is in use this type of proxy server called a transparent proxy server is the most common type However you can configure a Web browser to use a proxy server To do that using Internet Explorer click the Connections tab on the Internet Options box Then click LAN settings In the settings box check Use a proxy server for your LAN and enter the IP address of the proxy server see the left side of Figure 18 70 If your organization uses more than one proxy server click Advanced and enter IP addresses for each type of proxy server on your network see the right side of Figure 18 70 Click OK twice to close both boxes Leet Arpi Plures AM tees d TE A he el M mulo ecd ME age row m a5 manua ee Cab molum car gno aur L TIL eb EE reg er Kir USES di ee Ui hay pode fer our de od ef apo I Lm Il oer atas m r X Mami In Dno eee ee nih Ee ieee ar pede oe a e pipea R Darum nons a a pg etc HN eer See ea wn Figure 18 70 Configure Internet Explorer to use one or more proxy servers Courtesy Course Technology Cengage Learning SECURED CONNECTIONS Recall that two secure protocols that encrypt all transmissions are HTTPS and SSH The purpose of these security protocols is to prevent others on the Internet from eavesdropping on data in transit or from changing that data This last type of intrusion is called a man in the middle attack
81. te Assistance control window When the user accepts the request you can control her computer 4 The user can hide her desktop from you at any time by clicking Pause in the control window Troubleshooting Network and Internet Connections 969 aa 2H x amp 2 7 8 SS Se Ee PL HESS M aA eae Bep emi i ie ee l EE PEG Eg bi UM EE X m m Lm rr See kim Da oe Ro Ha Figure 18 66 The user s desktop can be viewed by the support technician Courtesy Course Technology Cengage Learning 4 Either of you can disconnect the session by clicking Disconnect in the control window 4 A log file is kept of every Remote Assistance session in the C Users username Documents Remote Assistance Logs folder The file includes the chat session If you type instructions during the chat session that will later help the user she can use the log file to remind her of what was said and done 4 If an invitation created by a user is not used within six hours the invitation expires If you have problems making the connection do the following 1 Windows Firewall on the user s computer might be blocking Remote Assistance Verify that Remote Assistance is checked as an exception to blocked programs in the Windows Firewall window 2 If you are outside the user s local network the hardware firewall protecting her network might be blocking Remote Assistance Verify that port forwarding on that hardware firewall is enabled for Remote Assistanc
82. these connections CONNECT TO THE INTERNET USING AN ON DEMAND BROADBAND CONNECTION OR STATIC IP ADDRESSING Most broadband connections today are always up and use dynamic IP addressing which are the assumptions that Vista and XP make when they create and configure a new network connection But some business services for cable modem or DSL use static IP addressing and a less expensive DSL service might use an on demand connection Follow these steps to create an on demand broadband connection to the Internet 1 Follow directions given in this chapter to connect the cable modem or DSL modem to the PC and to connect the modem to the wall jack Vista will automatically create a new connection configured with dynamic IP addressing and an always up connection 2 Click Start right click Network and select Properties from the shortcut menu The Network and Sharing Center window opens See Figure 18 9 Tus s an NUT in and Danag Cani Network and Sharing Center N 9 PEARL RPTCS ee aoe a iue i B Riet ersaner Bedi Figure 18 9 Use the Network and Sharing Center to create and manage network connections Courtesy Course Technology Cengage Learning 3 Click Set up a connection or network On the next screen see Figure 18 10 select Connect to the Internet and click Next Connecting to the Internet 927 but wd IN mupM EE au il uw Be zi GELD al La 5 deb oap ee de ce ee i herre Hrn eo Se 1 ee ee eee eee rms eee o
83. ties that can be used to trou bleshoot problems with TCP IP The most commonly used TCP IP utilities are Ping and Ipconfig which you learned about in the last chapter Table 18 1 lists these and other TCP IP utilities and lists the purpose for each Most of these program files are found in the Windows System32 folder The A 220 702 Practical Application exam expects you to know about the following TCP IP utilities listed in Table 18 2 Ipconfig Ping Net Netstat Tracert Nslookup and Telnet You need to know when and how to use each utility and you must be able to interpret results Now let s see how to use the Nslookup Tracert and Net utilities THE NSLOOKUP COMMAND Nslookup lets you read information from the Internet name space by requesting information about domain name resolutions from the DNS server s zone data Zone data is information about domain names and their corresponding IP addresses kept by a DNS server For exam ple to find out what your DNS server knows about the domain name www microsoft com use this command nslookup www microsoft com Tools and Utilities for Supporting and Troubleshooting Networks 957 Getmac Displays the NIC s MAC address not available in Windows 2000 Ipconfig Displays the IP address of the host and other configuration information A command used by UNIX similar to Ipconfig is ifconfig 4 To display all information about connections ipconfig all 4 To release the
84. tlet Transformer Power outlet Network card installed in PC provides network port Figure 18 1 Cable modem connecting to a PC through a network card installed in the PC Courtesy Course Technology Cengage Learning 2 Using coaxial cable connect the cable modem to the TV wall jack Plug in the power cord to the cable modem 3 When using a network port on your PC connect one end of the network cable to the network port on the PC and the other end to the network port on the cable modem A network cable is sometimes called an Ethernet cable or a patch cable A network port can also be called an Ethernet port You need to be familiar with all these terms and they are all used in this chapter 4 Vista automatically creates a new always up network connection and displays the Set Network Location window shown in Figure 18 2 Select the location most likely Home Cac a location cr the P erwosk d wowcek EN OO LLL STE ILIUM EL E IN EI I Home a ee aid pace ee cee egal CEZEL EA asd eA pLa UP QUU TT Pe E Pii au a GER ETE iCTTQngH ES pad deis gt N N m l N TM Cripia ba ii epoEI popi pagpa sed DTE Pulli RRHH pe a ciu fre reer ie tee bere m Derep ori cree era eed nmm Hd Figure 18 2 Vista asks for the location of the new connection so that it can configure the firewall Courtesy Course Technology Cengage Learning 922 CHAPTER 18 Networking Practices 5 For Windows XP right click
85. to access computers on your network from somewhere on the Internet or allow others to do so such as when you re hosting an Internet game or when you re traveling and want to use Remote Desktop to access your home computer In this section we ll look at how to drop your shields low enough so that the good guys can get in but the bad guys can t However know that when you drop your shields the least bit you re compromising the security of your network so be sure to use these methods sparingly Recall from Chapter 17 that a router can use NAT redirection to present its own IP address to the Internet in place of IP addresses of computers on the local network The NAT protocol is also responsible for passing communication to the correct port on the correct local computer EN OO gt N N m l N 948 CHAPTER 18 Networking Practices Here are the ways a device using NAT can protect your network using ports 4 Port filtering is used to open or close certain ports so they can or cannot be used Remember that applications are assigned these ports Therefore in effect you are filtering or controlling what applications can or cannot be used across the firewall For example in Figure 18 372 all requests from the Internet to ports 20 443 450 and 3389 are filtered These ports are closed 4 Port forwarding means that when the firewall receives a request for communication from the Internet to a specific computer and port the requ
86. to test a cable to find out if it is good or to find out what type of cable it is if the cable is not labeled You can also use a cable tester to trace a network cable through a building A cable tester has two components as shown in Figure 18 47 RJ 45 ports Adapter EN OO Figure 18 47 Use a cable tester pair to determine the type of cable and if the cable is good Courtesy Course Technology Cengage Learning To test a cable connect each component to the ends of the cable and turn on the tester Lights on the tester will show you if the cable is good and what type of cable you have You ll need to read the user manual that comes with the cable tester to know how to inter pret the lights You can also use cable testers to trace a network cable through a building Suppose you see several network jacks on walls in a building but you don t know which jacks connect Install a short cable in each of two jacks and then use the cable tester to test the continuity as shown in Figure 18 48 You might damage a cable tester if you connect it to a live circuit so before you start connecting the cable tester to wall Jacks be sure that you turn off all devices on the network J gt N N P l N 956 CHAPTER 18 Networking Practices Figure 18 48 Use cable testers to trace network cables through a building Courtesy Course Technology Cengage Learning TCP IP UTILITIES The TCP IP component of Windows includes several utili
87. urtesy Course Technology Cengage Learning m y o N HOW TO SET UP REMOTE DESKTOP FOR FIRST USE To prepare a computer to serve up Remote Desktop you need to configure the computer for static IP addressing and also configure Remote Desktop for service Here are the steps needed 1 As described earlier in the chapter you ll need a static IP address assigned to you by your ISP Configure your computer for static IP addressing If your computer is connected directly to your ISP assign the IP address given you by your ISP to your computer If you are using a router on your network assign your computer a private IP address for example 192 168 1 90 964 CHAPTER 18 Networking Practices 2 If you are using a router on your network configure the router for port forwarding and allow incoming traffic on port 3389 Forward that traffic to the IP address of your desktop computer Figure 18 38 shown earlier in the chapter shows one router configured for these settings 3 Use your browser to verify you have Internet access before you continue to the next steps If you have a problem first try repairing your connection and then try rebooting your PC You are now ready to configure Remote Desktop In the following steps we are using Windows Vista but know that the steps in Windows XP work about the same way Do the following 1 Click Start right click Computer and select Properties from the shortcut menu Click Advanced system setting
88. uter documentation to sign in Figure 18 29 This router by Linksys allows computers on a LAN to share a broadband Internet connection and is an access point for computers with wireless adapters Courtesy Course Technology Cengage Learning IER EI LENS 1 a T DNUS m i Conract to IALL TU wecam DUI DAR LLam A AL quar quoa cidunt ud sac Ub atado d hA IN TOAI GIL ray UU ae G Da ee xke ATO ae aeoT7 ALT de ee Figure 18 30 Log in to the router configuration utility Courtesy Course Technology Cengage Learning Setting Up a SOHO Network 943 The main Setup window appears as shown in Figure 18 31 For most situations the default settings on this and other screens should work to provide network access without any changes DE C Gt oe eb hapes Tem pee i EaI kiire bryr Pj Ligati Royle Tarn kism EE DCF banar kaming nerd G paskirs ee DHO aeeie Tieton mi wg ue Pin rom Rhe it LLL arpaa bene Hl i bm l Tit oid Te EE TET fae i L ue uz Stee D 3 i ai E l 1 F IQaIT p Se agen T mas gph Ce gt Figure 18 31 Basic Setup screen used to configure the router Courtesy Course Technology Cengage Learning EN OO J gt N N P N O N 944 CHAPTER 18 Networking Practices Following are some changes that you might need to make to the router s configuration The first one should always be done
89. w mcafee com include antivirus software as well as a software firewall Windows Vista automatically configures Windows Firewall based on the type of network it believes you are connected to Vista can assign you a public profile a private profile or a domain profile A public profile offers the highest level of protection when you are connected to a public network A private profile offers moderate protection when you are connected to a private network and the least protection is used for a domain profile when your PC is on a domain and security is managed by the domain s operating system such as Windows Server 2008 When a PC first connects to a new network that is not part of a domain Vista asks you if the network is a public or private network refer back to Figure 18 2 It saves this response and applies it each time you reconnect to this network Windows XP automatically sets the firewall for a moderate level of protection Connecting to the Internet 935 for Umi rae hirm oru eet ce io omi eod ol RER wellflcem aseo d mcd L i NOT hierin mi Iia hed lar a L a A a a EI oe ei Ni M s RE j bhed lm AnA sgh titm et Coe oe ai lt r amen m Dome Figure 18 20 ZoneAlarm allows you to determine the amount of security the firewall provides Courtesy Course Technology Cengage Learning For Windows Vista to see how firewall protection is set for a public or private network use the Network and Sharing Center window by following these
90. work 4 Charges for the ISDN line might be based on per minute use If that s the case make sure your e mail software or browser is not set to make the connection automatically J gt N N P l e N when you don t want to incur a charge 4 When you first set up ISDN connect the modem box and then configure the ISDN connection in the same way you would configure a dial up connection using a regular phone line 934 CHAPTER 18 Networking Practices IMPLEMENT WINDOWS FIREWALL AND VISTA NETWORK SECURITY The Internet is a nasty and dangerous place infested with hackers viruses worms and thieves Knowing how to protect a single PC or a LAN is an essential skill of a PC support technician The three most important things you can do to protect a single computer or network are to 4 Keep Windows updates current so that security patches are installed as soon as they are available 4 Use a software and or hardware firewall 4 Run antivirus software and keep it current In earlier chapters you learned how to keep Windows updates current In the next chapter you ll learn all about using antivirus software In this section you ll learn to use a software firewall and a hardware firewall Software firewalls are appropriate when you re protecting a single personal computer that is connected directly to the Internet or is part of a local network A hardware firewall such as a multipurpose router is used to protect all compute
91. y You might need to uninstall and reinstall the TCP IP component Compare the configuration to that of a working PC on the same network Troubleshooting Network and Internet Connections 973 4 If you re having a problem with slow network performance suspect a process is hogging network resources Use the netstat command with the b parameter described earlier in the chapter to help you find this program Netstat can also help you find out if the program you want to use to access the network is actually running 5 Verify that the software firewall on the PC is not the source of the problem Is Windows Firewall set correctly Is a third party personal firewall blocking communi cation ZoneAlarm sometimes gives problems by blocking communication that you want Try disabling ZoneAlarm If the connection now works carefully check all ZoneAlarm settings If you are having problems reaching another computer on your network follow these steps 1 Open the Vista Network window or the XP My Network Places window Normally a computer on the network shows up in these places as an icon Try to drill down to the shared resources on this computer Press the F5 key to refresh the window 2 Now try to ping the host computer you are trying to reach If it does not respond then the problem might be with the host computer or with the network to the computer 3 When trying to reach a computer on your local network try the Ping command with the I
92. y useful when I work from a remote location my home office and need to access a corporate network to support software on that network Using the Internet I can access a file server on these secured networks to make my software changes It s easy to use and relatively safe for the corporate network To use Remote Desktop the computer you want to remotely Tools and Utilities for Supporting and Troubleshooting Networks 961 Ee umm aw FUB dich ILL 47 0 9 a rid rirka gnug ida FETHER PEEL EPH ae Pirh apr 2701 at me D Fink apr oa ep Putt me E iE L imis Tee ae rrTEIELTENEDR can nar Ml amma Inr ay beet ru fitu Uh TI srar laser cur MEAT oe wu Sup Perl imis E IRI B 10L 3305 wirtabilataruer apemp EE DEerb k F uL Ln ie icc lade ver AIL PITE Redi Sedi a aa TELLITE S i TEET E ee eg 1j F T i pest jen aque Choo ere Pages wise Pee Tue cubes rf arn rmm inm et girs kw Figure 18 54 Record results to a log file to watch for programs using networking resources Courtesy Course Technology Cengage Learning access the server must be running Vista Business or Ultimate editions or Windows XP Professional but the computer you re using to access it the client can be running any version of Windows The A 220 702 Practical Application exam expects you to know how to use Remote Desktop In this section you ll first see how Remote Desktop can be used and then you ll see how to s

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