qr code generator in asp.net c# Monitoring and Troubleshooting DHCP in .NET framework

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Monitoring and Troubleshooting DHCP
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In this lab, you troubleshoot a DHCP failure. 1. From Computer2, log on to Domain1 as Administrator. 2. Insert the Supplemental Course Materials CD-ROM into the Computer2 disk drive. 3. Locate and double-click the following batch file: \70-291\labs\08. 4. Open a command prompt on Computer2 and enter the following: ipconfig /renew. The address fails to renew. 5. Take a few minutes to troubleshoot the connection on both computers. Using either Netsh commands or the DHCP console, verify that the server has been authorized, that the scope is active, and that the DHCP server has been given an appropriate address. Next, verify that the scope s features such as exclusion ranges, reservations, options, and address ranges have been properly defined. 6. After you have completed the tasks in step 5, answer the following question: Why is the DHCP server not leasing addresses
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7. After you have discovered the error, use the Ipconfig command to verify that Computer2 has adopted its alternate address of 192.168.0.2. If the address is listed as 0.0.0.0, enter ipconfig /renew. 8. When you can verify that Computer2 has adopted the alternate configuration address of 192.168.0.2, locate and double-click the following batch file on the Sup plemental Course Materials CD: \70-291\labs\08. The proper settings for the DHCP server are restored. The settings are not altered if they are already correctly configured. 9. On Computer2, at a command prompt type the following command: ipconfig /renew. Computer2 receives a fresh IP configuration from the DHCP server. 10. Log off Computer1 and Computer2.
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Monitoring and Troubleshooting DHCP
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The DHCP client initialization process occurs when a client computer first starts and attempts to join the network. The initialization process consists of an exchange of four broadcast messages: Discover, Offer, Request, and ACK. Through a feature known as audit logging, all daily DHCP server activity is recorded in comma-delimited text files. By default, DHCP server log files can be found in the folder WINDOWS\System32\Dhcp. Events in DHCP server log files are specified by event ID. Event IDs below 50 are described in each log file and do not need to be memorized. Events over 50 pertain to rogue server detection (Active Directory authorization status). You can either learn these events or consult a reference when you need to determine their meaning. When a DHCP server stops providing leases to clients, you should always check the DHCP log to determine whether an authorization failure has occurred. When troubleshooting DHCP, first determine whether the error is on the client, in the physical network, or on the server. To verify a DHCP server configuration, verify that the server has been properly installed, authorized, and bound. To verify a scope configuration, verify that the scope is activated, and check the set tings for the address range, subnet mask, exclusions, reservations, and superscopes.
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Exam Highlights
Before taking the exam, review the key points and terms that are presented in this chapter.
Key Points
Understand the various types of DHCP messages and the functions they serve. Know the various ways to renew and refresh an address lease: Ipconfig /renew, the Repair button, and restarting the client computer. Understand the distinct function of the DHCP audit log, and be able to read audit log messages. Understand the benefits of raising conflict detection on the DHCP server. Understand the benefits and disadvantages of long and short lease durations. Be able to spot configuration errors in a DHCP server and scope.
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Monitoring and Troubleshooting DHCP
Key Terms
DHCP Discover A DHCP message broadcast by a DHCP client that allows the client to find a DHCP server. DHCP NACK A message sent by a DHCP server to a client to indicate that the IP address that the client requested is not correct for the local IP network served by the DHCP server. Giaddr A field in a DHCP message that records the address of a relay agent or RFC 1542 compatible router. This field allows a DHCP server to assign appropriate addresses to clients on remote subnets. database restore flag A setting that indicates whether the DHCP Server service loads a copy of the DHCP database in its default backup directory when the ser vice is reinitialized. By default, the flag is set to 0, and the backup is not loaded when the service starts. When the flag is set to 1, the backup is loaded when the service starts.
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