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Lesson Review
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The following questions are intended to reinforce key information presented in this lesson. If you are unable to answer a question, review the lesson materials and try the question again. You can find answers to the questions in the Questions and Answers section at the end of this chapter. 1. You cannot ping a computer on a local subnet, even after you reboot the com puter. What should you do next a. Check for hardware errors. b. Run Ipconfig with the /all switch. c. Run Network Diagnostics in verbose mode. 2. After changing the network card of a certain computer, you find that you can no longer ping that computer from another computer on the local subnet. You have checked the TCP/IP configuration on both computers and have found no errors. Both computers can also ping themselves successfully. Finally, you have also ver ified that the most recent version of the new NIC driver is installed and that Device Manager reports the device is working correctly. What should be your next step a. Check for errors in the ARP cache. b. Perform a Network Monitor trace from the nearest router. c. Run Ipconfig with the /all switch. 3. From a host named C1, you cannot ping another host named C2 that is located on the same subnet. You have examined the IP properties of both computers and have determined that neither computer contains TCP/IP configuration errors. Both computers can ping themselves, but only C2 can ping other computers. You have also verified that no errors exist in either computer s IP-to-hardware address mappings. What should be your next step a. Check for hardware errors on C1. b. Run Network Diagnostics. c. Check for errors in the ARP cache. d. Check for hardware errors on C2.
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Lesson 2
Drawing Code 128 Code Set A In VB.NET
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Troubleshooting TCP/IP Connections
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3-31
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4. You are experiencing a delay when you connect to a remote Web site. Which tool allows you to determine which particular routers are responsible for the delay a. Netdiag b. Network Diagnostics c. Tracert d. PathPing
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Lesson Summary
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Use the Ipconfig command to get basic host computer configuration information, including the IP address, subnet mask, and default gateway. The /all switch adds more detailed information for each network adapter. Network Diagnostics is a graphical troubleshooting tool that provides detailed information about a local computer s networking configuration. You can access the tool through Help And Support. Like Network Diagnostics, the Netdiag command-line utility runs a series of tests on the local computer and then displays the results of those tests. Ping is a tool that helps to verify IP-level connectivity; the PathPing tool detects packet loss over multiple-hop trips. When troubleshooting a connection, first ping the loopback address, then the local IP address, then the default gateway, then a remote host by IP address, and then a remote host by host name. If you are troubleshooting delays to a remote host, use PathPing. Tracert is a route-tracing utility that allows you to track the path of a forwarded packet from router to router for up to 30 hops. Use Tracert when you have no con nectivity to a site under investigation because it tells you where connectivity stops. If you can ping the loopback address, your own IP address, and the default gateway, but you cannot ping a computer on the local subnet, the next step is to check the ARP cache for errors. If you cannot ping a computer on a local subnet by IP address, and the ARP a command reveals no errors in hardware address mappings, you should investigate physical media such as LAN cards, hubs, and cables for errors.
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Case Scenario Exercise
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You are the network administrator for a company employing 300 people and consist
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ing of one headquarters and two branch offices in neighboring cities. The IT depart
ment is located at the headquarters, whose network consists of three subnets behind a
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3
Monitoring and Troubleshooting TCP/IP Connections
firewall. Each of the branch offices consists of a single subnet behind a firewall. The three offices communicate with each other over the Internet. Figure 3-12 shows a map of the company network.
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