Question 4) Microsoft Windows XP Professional

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Objective : Implementing, Managing, and Troubleshooting Network Protocols and Services
SubObjective : Configure and troubleshoot the TCP/IP protocol.

Single Answer Multiple Choice

 

You are the desktop administrator for your company. All client computers run Windows XP Professional. DHCP is used on your network.

 

A user calls to report that he cannot access network resources. You investigate and discover that the IP address of the user’s computer is 169.254.0.6. You also discover that other clients on the same subnet are experiencing the same problem. You must provide network connectivity for the user.

 

What should you do?

 

 

  1. Enable Automatic Private IP Addressing.
  2. Disable Automatic Private IP Addressing.
  3. Ensure the computer is enabled as a DHCP client.
  4. Ensure that a DHCP server or DHCP relay agent resides on the local subnet.

 

 

 

 

 

Answer:
D. Ensure that a DHCP server or DHCP relay agent resides on the local subnet.

Tutorial:
You should ensure that a DHCP server or DHCP relay agent resides on the local subnet. On the Internet Protocol (TCP/IP) Properties dialog box, you can click the Alternate Configuration tab to configure options for alternative configuration, including Automatic private IP address. This option is the default setting, which permits the system to assign an IP address in the reserved for private IP-addressing class that ranges from 169.254.0.1 through 169.254.255.254. A subnet mask of 255.255.0.0 is also assigned. This TCP/IP configuration is used until a DHCP server is located. With this option enabled, DNS, WINS, or a default gateway are not assigned because automatic private IP addressing supports only a small network consisting of a single subnet. The fact that Automatic Private IP Addressing is being used indicates that the client cannot be serviced by a Dynamic Host Configuration Protocol (DHCP) server. Other client computers on the subnet will experience the same result.

You should not enable Automatic Private IP Addressing. Because the IP address of the user’s computer is 169.254.0.6, this IP address was issued from APIPA, which is already being used on the computer. APIPA addressing is only used until a DHCP server is located.

You should not disable Automatic Private IP Addressing. Because Automatic Private IP Addressing (APIPA) is only used when no DHCP server is available, disabling APIPA will not resolve the problem. The only way to disable APIPA is to specify the User configured option and manually configure all TCP/IP parameters. This is not recommended in networks using DHCP because it increases the chance of incorrectly configuring TCP/IP.

You should not ensure the computer is enabled as a DHCP client because the computer could not receive an APIPA address unless it was already a DHCP client. To determine whether the computer is enabled as a DHCP client, run IPCONFIG /ALL. To use DHCP in a network, hosts in the network must be configured to use DHCP. To enable a DHCP client, click Obtain an IP address automatically in the General tab of the Internet Protocol (TCP/IP) Properties dialog box.

If the only DHCP server is located on a subnet remote to the client, and routers do not forward DHCP requests, you must install a DHCP relay agent on the client’s subnet. A relay agent is a small program that relays DHCP/BOOTP messages between clients and servers on different subnets. The DHCP Relay Agent component provided with the Windows 2000 router is a BOOTP relay agent that relays DHCP messages between DHCP clients and DHCP servers on different IP networks. DHCP relay agents are useful when you have routers that do not forward DHCP requests.

Reference:
1. MCSE Training Kit – Microsoft Windows XP Professional – Installing, Configuring, and Troubleshooting Network Protocols
– Lesson 2: Configuring and Troubleshooting TCP/IP

2. Implementing and Supporting Microsoft Windows XP Professional Workbook – Configuring and Supporting TCP/IP
– Overview of IP Address Assignment, Enabling Alternate IP Configuration

 

These questions are derived from the Self-Test Software Practice Test for Exam #70-270 – Installing, Configuring, and Administering Microsoft Windows XP Professional.

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