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Chapter 19: Troubleshooting Network Problems Using TCP/IP Utilities Overview This chapter discusses utilities that are commonly used to troubleshoot problems that occur in a network running the TCP/IP protocol. Teaching Suggestions This chapter contains a lot of information about utilities and the myriad of switches that are used with each. Although the students do not need to know every switch, they should know those that are the most common or most widely used. For example, they should be able to display the contents of the ARP cache (arp –a). They should also know how to make a host continuously PING another host until manually interrupted (ping –t). The best way I have found to teach this chapter is to explain the purpose of each utility. I then demonstrate the utility and show students the type of results they should expect. If they don’t get the desired results, they must be able to figure out why. For example, if they are unable to PING a host or Web site by name, they should know to try to PING it by IP address. Once I have demonstrated the utilities, I then present the students with problems or scenarios and have them tell me which utility (and switches, when appropriate) should be used. Finally, I strongly suggest allowing them to sit in front of a computer and try out each utility and switch, so they can see the results of each. You might mix this activity with the paragraph above. That is, present them with a problem and have them resolve it while sitting in front of the computer and using the utility. Hardware and Software Requirements Each student should have access to a personal computer. The computer should be running a Windows-based operating system. You might also have one or more UNIX- or Linux-based computers for testing the IFCONFIG and Nslookup utilities.