Questions and Answers


Lesson 1 Review

  1. List the required and optional parameters that you can assign to a host on a TCP/ IP network.

    You must assign each device a unique IP address, a subnet mask, and a default gateway. Optionally, you can also assign hosts the addresses of DNS and WINS servers.

  2. List the three primary address classes used for assigning IP addresses to hosts on the Internet and the corresponding range of IP addresses available in each class.

    IP addresses are divided into five classes: A, B, C, D, and E. Hosts on the Internet are assigned IP addresses from the first three classes only: A, B, and C. The network IDs for Class A addresses range from 1.0.0.0 to 126.0.0.0. The network IDs for Class B addresses range from 128.0.0.0 to 191.0.0.0. The network IDs for Class C addresses range from 192.0.0.0 to 223.0.0.0.

  3. Which of the following default subnet masks would be used on a computer connected to the Internet with the IP address 157.54.4.201?

    1. 255.0.0.0

    2. 255.255.0.0

    3. 255.255.255.0

    4. 255.255.255.255

    b is the correct answer. The IP address 157.54.4.201 is in the Class B range of addresses. The default subnet mask for Class B addresses is 255.255.0.0. a is not correct because 255.0.0.0 is the default subnet mask for Class A addresses. c is not correct because 255.255.255.0 is the default subnet mask used for Class C addresses. d is not correct because 255.255.255.255 is an invalid subnet mask.

Lesson 2 Review

  1. You are troubleshooting a networking problem for a user. Although the user had no problem connecting to the network when she left the office yesterday afternoon, she cannot connect to the network this morning. You know that other users on the network are not having the same problems. What is the first thing you should check?

    You should make sure that the network cable is seated properly in the jack on the back of the user’s computer and in the jack on the wall. It is likely that something happened overnight, such as the office being cleaned, that caused the connection to loosen.

  2. A user complains to you that he cannot connect to any network resources after he installed a new network adapter card. You open the Command Prompt window on the user’s computer and type ipconfig /all. You get the following results:

    • Ethernet adapter Local Area Connection:

    • Connection-specific DNS Suffix

    • Description : Intel(R) PRO/1000 CT

    • Physical Address : 0B-01-C4-32-E1-2C

    • DHCP Enabled : Yes

    • IP Address : 169.254.023.102

    • Subnet Mask : 255.255.0.0

    • Default Gateway :

    • DNS Servers:

    What do these results tell you? (Choose all that apply.)

    1. The computer is configured to connect to a DHCP server.

    2. The computer is not configured to connect to a DHCP server.

    3. The computer is successfully connecting to a DHCP server.

    4. The computer is not successfully connecting to a DHCP server.

  3. You are troubleshooting a network connectivity problem on a users computer. At the command prompt, you type the Ipconfig /all command and receive the following results:

    • IP Address……192.168.0.5

    • Subnet Mask…….255.255.255.255

    • Default Gateway……192.168.0.7

    Which of these values is most likely configured incorrectly?

    The subnet mask is configured incorrectly. The IP address displayed is a Class C address (as is the gateway). The default subnet mask for a Class C address should be 255.255.255.0. The subnet mask 255.255.255.255 is an invalid subnet mask.

Lesson 3 Review

  1. You are troubleshooting a network connection and need to use the Ping command to see if a host is reachable. Which ICMP option should you enable on the host computer?

    1. Allow Incoming Router Request

    2. Allow Incoming Echo Request

    3. Allow Outgoing Source Quench

    4. Allow Redirect

    b is the correct answer because it allows the host computer to respond to ping requests. a is incorrect because this option provides information about connected routers and the flow of traffic from the computer. c is incorrect because this option allows the computer to send a message to slow the flow of data. d is incorrect because this option allows routers to redirect data to more favorable routes.

  2. One of your users has a home computer running Windows XP Professional and has a dedicated Internet connection. The customer has ICF configured on the computer. The user installed Web server software on the computer so that she can host her own website. However, users from the Internet cannot view the website. What should the customer do?

    1. On the Services tab of the ICF’s Advanced Settings dialog box, select the Web Server (HTTP) check box.

    2. On the Services tab of the ICF’s Advanced Settings dialog box, define a custom service.

    3. On the ICMP tab of the ICF’s Advanced Settings dialog box, select the Web Server (HTTP) check box.

    4. The customer must disable ICF in order to allow access to the website.

    a is the correct answer. Use the Services tab to select the services running on a computer that Internet users are allowed to access. b is not correct because the customer does not need to define a custom service; the Web Server (HTTP) service already exists. c is not correct because the Web Server (HTTP) check box, as well as options for allowing other services, are located on the Services tab, not on the ICMP tab. d is not correct because the customer does not need to disable ICF.

Lesson 4 Review

  1. A user calls you to ask for help configuring a hardware driver, but is having trouble following the instructions that you give him over the telephone. You decide that it is easier to show the user how to perform the configuration by taking control of his desktop. What tool is better suited to this task?

    Remote Assistance is best, so you should have the user send you a Remote Assistance invitation. When using Remote Assistance, you can take shared control of the desktop, which allows you to perform the configuration while the user watches.

  2. What are the requirements for running Remote Desktop?

    The remote computer must be running Windows XP Professional. After enabling Remote Desktop on this computer, you must make sure that the user who will connect remotely is a member of either the Administrators or Remote Users group.

Case Scenario Exercises: Scenario 10-1

A user calls to tell you that he has tried to configure Remote Desktop so that he can use his home computer running Windows Home Edition to connect over the Internet to his office computer running Windows XP Professional. The user enabled Remote Desktop on the office computer, which is one of twelve computers on a small network. He then successfully established a Remote Desktop connection from one of the other computers on the office network. However, when the user tries to connect from his home computer, he receives an error message stating that he cannot connect to the computer, and that the problem is most likely a networking error. What should you suspect?

Since the user can connect successfully from another computer on the office network, Remote Desktop is enabled and configured correctly. Since the user’s office computer is on a small network connected to the Internet, it is likely that a firewall is configured to protect the network from malicious activity from the Internet. If a firewall is in place, it will by default block Remote Desktop traffic. The user needs to open port 3389 on the firewall in order to allow Remote Desktop traffic to pass through to the network.

Case Scenario Exercises: Scenario 10-2

A user on a small office workgroup has returned from a weeklong vacation. She starts her computer, and everything seems to be functional. As the day progresses, she accesses data from a workgroup file server and prints to a network printer. Later, she tries to access another workgroup resource: a printer that is attached to a user’s computer in the office upstairs, but she receives an error saying that the printer cannot be found. She reports that the network cable is connected and that she can access other resources on the network. What is the first thing you should do?

  1. Check the status of the network router.

  2. Check the status of the computer upstairs.

  3. Ping the computer’s loopback address.

  4. Use the Tracert command at a command prompt to view the route and possible packet losses.

    b is correct. Because the user can access other network resources, the problem is probably with the resource itself. The other answers are probably not correct because the user is able to access other network resources.

Troubleshooting Lab

You are working as a DST for a technical support company. A user calls to tell you that she cannot access websites from her home computer. While investigating the problem, you determine the following information:

  • The user cannot access any sites on the Internet.

  • The user could access sites previously by using the same computer.

  • The user has made no changes recently to Internet Explorer or to any of her network connections.

  • The user’s computer is connected directly to a cable modem.

Using the information you learned in this chapter, how would you troubleshoot this problem?

Because this is a home connection on a cable modem, you can be fairly sure that the computer should be configured to obtain an IP address automatically from the ISP. Your first step, therefore, should be to open a command prompt and type ipconfig /all. Look for any problems with the IP addressing information. If you see an IP address in the 169.254 range, for example, you know that the computer is configured to obtain an IP address automatically but cannot reach the DHCP server. This probably points to a loose cable or a malfunctioning network adapter or cable modem. If you rule out these problems, there is probably a problem at the ISP.




MCDST Self-Paced Training Exam 70-271(c) Supporting Users and Troubleshooting a Micro[... ]ystem
MCDST Self-Paced Training Exam 70-271(c) Supporting Users and Troubleshooting a Micro[... ]ystem
ISBN: N/A
EAN: N/A
Year: 2006
Pages: 195

flylib.com © 2008-2017.
If you may any questions please contact us: flylib@qtcs.net