Objective 5.1: Troubleshoot TCPIP | MCDST Self-Paced Training Exam 70-271(c) Supporting Users and Troubleshooting a Micro[... ]ystem

Objective 5.1: Troubleshoot TCP/IP

As a DST, you should know how to troubleshoot connectivity problems that are the result of a workstation on which TCP/IP is incorrectly configured. You should understand the mandatory configuration parameters that must be set when you are doing a manual configuration, namely, IP address and subnet mask. In addition, you should understand that if a workstation needs to communicate outside its local network and deliver packets to a remote network, you must also configure a default gateway address, which is the address of the network router that forwards packets. You should also know how to troubleshoot and configure a workstation to obtain its TCP/IP configuration automatically from a Dynamic Host Configuration Protocol (DHCP) server.

To answer the questions in this area, you should be familiar with the available TCP/IP tools, know how to use these tools, and be able to troubleshoot manual and automated TCP/IP address configuration. You should also know how to answer end-user questions pertaining to Windows Internet Connection Firewall (ICF) settings.

Objective 5.1 Questions

You are a DST for a large florist business that supports 25 workstations running Windows XP Professional. The company uses a DHCP server for its TCP/IP configuration. You receive a telephone call from the network administrator asking you to configure a new workstation that has been added. What must you configure on the new workstation running Windows XP Professional?
1. IP address only.
2. IP address and subnet mask.
3. IP address, subnet mask, and default gateway.
4. Nothing. The DHCP server will assign the necessary parameters.
Which of the following parameters must be manually configured on a workstation running Windows XP Professional if the workstation must be able to connect to the Internet? (Choose all that apply.)
1. IP address
2. Subnet mask
3. Default gateway
4. DNS address
You are a DST for a large newspaper company that uses DHCP to assign TCP/IP configuration parameters to over 300 workstations running Windows XP Professional. You are troubleshooting a manager’s workstation that is unable to connect to any network resources using IP addresses. From her computer, you enter the command Ipconfig and receive the following information: IP Address: 169.254.23.57; Subnet Mask: 255.255.0.0; Default Gateway: <blank>. What is the most likely reason the manager cannot access any resources?
1. Incorrect subnet mask
2. No default gateway configured
3. DHCP server not available
4. DNS not configured
You are a DST for a marketing consulting firm that supports 20 sales representatives. The sales representatives are using laptop computers running Windows XP Professional. One of the sales representatives wants to know whether it is possible to have her laptop receive its TCP/IP configuration from the DHCP server at the office but use static IP configuration parameters when she is at home. How should she do this?
1. She will need to purchase an additional PCMCIA network adapter card and configure one with static TCP/IP information and the other as a DHCP client.
2. She can configure a static configuration by using the Alternate Configuration tab of the TCP/IP properties dialog box.
3. She can create a user profile.
4. She can configure multiple protocols on her NIC (network interface card).
You are a DST for a help desk and need to troubleshoot connectivity problems that one of your users is having. You are sitting at the workstation that is running Windows XP Professional and have just checked the physical connections of the cables and have unsuccessfully tried to ping a remote workstation. What is your next step?
1. Call the network administrator.
2. Ping the default gateway.
3. Ping the loopback address (127.0.0.1).
4. Use tracert.
You are a DST for a large publishing company and support 40 workstations running Windows XP Professional. A user is having connectivity problems, and you want to view his current TCP/IP configuration. Which command should you enter at his workstation?
1. Ipconfig /all
2. ifconfig
3. msconfig
4. nslookup
Which command is used to update your workstation running Windows XP with new TCP/IP configuration information?
1. Ipconfig /update
2. Ipconfig /release
3. config /renew
4. Ipconfig /renew
You are a DST for a large IT consulting company that supports more than 300 workstations, all running Windows XP Professional. Your company has several firewalls implemented, as well as an intrusion-detection system (IDS). The network administrator has asked you to disable Internet Connection Firewall on a user’s workstation. How should you do this?
1. Select Disable ICF from the Security tab of the System Properties dialog box.
2. Deselect Protect My Computer And Network By Limiting Or Preventing Access To This Computer From The Internet on the Advanced tab of the Properties dialog box of Network Connections.
3. ICF can be disabled only through a Registry edit.
4. To disable ICF, you must use the Add Or Remove Programs utility and remove ICF.

Objective 5.1 Answers

Correct Answers: D
1. Incorrect: Because DHCP is used in the office, you simply need to select the Obtain An IP Address Automatically option in the Internet Protocol (TCP/IP) Properties dialog box (the default option in Windows XP).
2. Incorrect: Because DHCP is used in the office, you simply need to select the Obtain An IP Address Automatically option in the Internet Protocol (TCP/IP) Properties dialog box (the default option in Windows XP). IP address and subnet mask are mandatory parameters when manually configuring TCP/IP, but the information will be supplied by the DHCP server when the client workstation starts.
3. Incorrect: Because DHCP is used in the office, you simply need to select the Obtain An IP Address Automatically option in the Internet Protocol (TCP/IP) Properties dialog box (the default option in Windows XP). IP address and subnet mask are mandatory parameters when manually configuring TCP/IP, but the information will be supplied by the DHCP server when the client workstation starts. A DHCP server can also assign the default gateway address, DNS server IP address, and Windows Internet Naming Service (WINS) server parameters to a DHCP client workstation.
4. Correct: Because DHCP is used in the office, you simply need to select the Obtain An IP Address Automatically option in the Internet Protocol (TCP/IP) Properties dialog box (the default option in Windows XP). IP address and subnet masks are mandatory when manually configuring TCP/IP, but the information will be supplied by the DHCP server when the client workstation starts. A DHCP server can also assign the default gateway address, DNS IP address, and WINS server parameters to a DHCP client workstation.
Correct Answers: A, B, and C
1. Correct: Workstations that have TCP/IP manually configured must have an IP address.
2. Correct: Workstations that have TCP/IP manually configured must have an IP address and a subnet mask.
3. Correct: Manually configured workstations must have an IP address, a subnet mask, and a default gateway if the workstation will connect to a remote network.
4. Incorrect: Even though DNS should be configured on a workstation connecting to the Internet, it is optional. Users can enter the IP addresses of the Web sites they want to connect to by using Internet Explorer, or a HOSTS file can be populated with the host names and IP addresses of the Web sites most visited by the user.
Correct Answers: C
1. Incorrect: The address assigned to the manager is an Automatic Private IP Addressing (APIPA) address. This address is assigned when a client workstation is configured to automatically receive TCP/IP configuration from a DHCP server but a DHCP server is not available. The address 169.254.23.57 is a Class B address. The default subnet mask for a Class B address is 255.255.0.0. Class A addresses have a default subnet mask of 255.0.0.0. Class C addresses have a default mask of 255.255.255.0. There is nothing wrong with the subnet mask in this example.
2. Incorrect: Dynamic Host Configuration Protocol (DHCP) is used on a network to automatically issue IP addresses, subnet masks, default gateway information, and other TCP/IP configuration to workstations that participate in address selection. If a DHCP server is not available, Windows XP will assign an IP address and a subnet mask to the workstation. The IP address will be from the range of private IP addresses: 169.254.0.1 through 169.254.255.254. APIPA does not assign a default gateway address to the workstation because private addresses are not routable.
3. Correct: Dynamic Host Configuration Protocol (DHCP) is used on a network to automatically issue IP addresses, subnet masks, default gateway information, and other TCP/IP configuration to workstations that participate in address selection. If a DHCP server is not available, Windows XP will assign an IP address and a subnet mask to the workstation. The IP address will be from the range of private IP addresses: 169.254.0.1 through 169.254.255.254. Automatic Private IP Addressing (APIPA) does not assign a default gateway address to the workstation because private addresses are not routable.
4. Incorrect: Domain Name System (DNS) is a name resolution server that resolves host names to IP addresses. In this example, the manager’s workstation could not connect to any network resources while using the IP addresses of the resources. Name resolution is not an issue here. If a client workstation is configured to receive its TCP/IP configuration from a DHCP server and a DHCP server is not available, Windows XP will assign an IP address and a subnet mask to the workstation. The IP address will be from the range of private IP addresses: 169.254.0.1 through 169.254.255.254. APIPA does not assign a default gateway address to a workstation, DNS IP addresses, or any other TCP/IP configuration.
Correct Answers: B
1. Incorrect: The Alternate Configuration tab of the TCP/IP properties dialog box allows for a static configuration to be implemented when a DHCP server is not available.
2. Correct: At the Alternate Configuration tab, she can configure the static TCP/IP configuration that will be used when the DHCP server is not available.
3. Incorrect: User profiles are created when a user first logs on to a workstation. User profiles are not used to create alternate TCP/IP configurations but to define a user’s desktop settings. The Alternate Configuration tab of the TCP/IP properties dialog box allows you to create an alternate TCP/IP setting for a static configuration that will be used when a DHCP server is not available.
4. Incorrect: This would not solve the manager’s problem. If she wants to use DHCP at the office and static IP configuration at home, the best solution would be to configure static IP information on the Alternate Configuration tab of the TCP/IP properties dialog box.
Correct Answers: C
1. Incorrect: Before calling the network administrator, you should attempt to troubleshoot the workstation by first pinging the loopback address. This will test whether TCP/IP has been configured on the workstation.
2. Incorrect: First and foremost, you should confirm that the network cable is connected and that the network adapter is working. You might see a green light or blinking lights on the adapter. After attempting to ping a remote host, you should attempt to ping the loopback address, then a local workstation, and finally the default gateway. If you are able to ping a remote host at the beginning of your testing, you can skip the other steps.
3. Correct: First and foremost, you should confirm that the network cable is connected and that the network adapter is working. You might see a green light or blinking lights on the adapter. After attempting to ping a remote host, you should attempt to ping the loopback address, then a local workstation, and finally the default gateway. If you are able to ping a remote host at the beginning of your testing, you can skip the other steps.
4. Incorrect: The tracert command is useful when you want to determine the path that a packet takes across a network. In troubleshooting network connectivity issues, the Ping command is the most useful. Before using the Ping command, you should confirm that the network cable is connected and that the network adapter is working. You might see a green light or blinking lights on the adapter. After attempting to ping a remote host, you should attempt to ping the loopback address, then a local workstation, and finally the default gateway. If you are able to ping a remote host at the beginning of your testing, you can skip the other steps.
Correct Answers: A
1. Correct: The Ipconfig /all command lists all of the TCP/IP configuration for the workstation.
2. Incorrect: This is not the correct command for a Windows XP workstation. The ipconfig /all command lists all of the TCP/IP configuration for a workstation running Windows XP.
3. Incorrect: To display TCP/IP information, use ipconfig /all. The msconfig command is the command used to examine Windows XP system configuration
4. Incorrect: The nslookup command is the tool that you use for troubleshooting DNS errors. To view TCP/IP configuration information, use the ipconfig /all command.
Correct Answers: D
1. Incorrect: To renew your DHCP-supplied configuration, use the ipconfig /renew command.
2. Incorrect: The ipconfig /release command will remove your current TCP/IP configuration information. You must do a /renew to get new TCP/IP information after executing the /release command.
3. Incorrect: There is no such command as config /renew. To update your workstation with new TCP/IP configuration information, execute the ipconfig /renew command from the command prompt.
4. Correct: To update your workstation with new TCP/IP configuration information, execute the ipconfig /renew command from the command prompt.
Correct Answers: B
1. Incorrect: There is no such option as Disable ICF. To disable ICF, deselect Protect My Computer And Network By Limiting Or Preventing Access To This Computer From The Internet on the Advanced tab of the Properties dialog box of Network Connections.
2. Correct: To disable ICF, deselect Protect My Computer And Network By Limiting Or Preventing Access To This Computer From The Internet on the Advanced tab of the Properties dialog box of Network Connections.
3. Incorrect: To disable ICF, deselect Protect My Computer And Network By Limiting Or Preventing Access To This Computer From The Internet on the Advanced tab of the Properties dialog box of Network Connections.
4. Incorrect: To disable ICF, deselect Protect My Computer And Network By Limiting Or Preventing Access To This Computer From The Internet on the Advanced tab of the Properties dialog box of Network Connecteions.