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For the exam, make sure you understand how to enable automatic configuration of DNS servers and where you would go to specify particular DNS servers. Also make sure you know how to enable WINS.
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LMHOSTS
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An LMHOSTS file is a text file located on the local computer that maps NetBIOS names to their IP addresses for hosts that are not located on the local subnet. In Windows XP Professional, that file is located in the %SystemRoot%\System32\Drivers\Etc folder. LMHOSTS files can be manually updated and are useful in small networks where IP addresses change infrequently, or for networks with resources that have static IP addresses. When configuring WINS servers, make sure the Enable LMHOSTS Lookup check box is selected. LMHOSTS files serve as a backup for WINS servers.
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Common Connectivity Problems
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HOSTS files are local text files that map host names and FQDNs to IP addresses. They are also located in the %SystemRoot%\System32\Drivers\Etc folder. Figure 8-17 shows a sample HOSTS file.
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Figure 8-17 A HOSTS file maps host names and FQDNs to IP addresses.
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Computers on the network are identified with their IP addresses. If a computer using a HOSTS file cannot connect to another using its host name, check this file for a bad entry.
Lesson Review
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 are troubleshooting a connectivity problem on a small home office workgroup that includes four computers connected through an Ethernet hub. Each computer is connected directly to the Internet, and all computers should retrieve all TCP/IP addressing information automatically. One of the users complains that she can access other computers on the network but cannot access any websites. The other three computers are working just fine. You verify that the computer in question does not reach any websites when you type in the URL. However, you can get to websites when you type the actual IP address. You use the ipconfig /all command on each computer and determine that the computer that cannot access websites has different DNS servers listed than the other three computers. What is the likely problem
2. You ping the other computers by IP address. The user at Computer1 cannot access any workgroup resources but is able to access the shared printer connected
Lesson 4
Resolving Name-Resolution Issues
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directly to her computer; the other three computers can access all workgroup resources except for resources on Computer1, including the shared printer. What is most likely the problem A. APIPA is in use. B. The network bridge is corrupt. C. The configured DNS server is not available. D. The Ethernet cable on Computer1 is disconnected from the NIC or the hub.
Lesson Summary
DNS and WINS are automatic name-resolution services that resolve computer names to IP addresses. DNS is the native name-resolution mechanism used on the Internet and on Windows Server 2003 based networks. WINS is used on networks that support previous operating systems. HOSTS files are local text files that map host names and FQDNs to IP addresses. You can think of them as the manual equivalent of DNS. LMHOSTS files are local text files that map NetBIOS names to their IP addresses. You can think of them as the manual equivalent of WINS.
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8
Common Connectivity Problems
Lesson 5: Troubleshooting Internet Connection Sharing
Internet Connection Sharing (ICS) offers a simple way to configure computers in a small home office network to share a single Internet connection. For small networks, ICS offers a cost-effective way to provide Internet access to multiple computers.
After this lesson, you will be able to
Configure Internet Connection Sharing. Identify the limitations of ICS. Enable ICS on a computer running Windows XP .
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