Q&A for May 18, 2001

Welcome to Certifiable, your exam prep headquarters. Here you'll find questions about some of the tricky areas that are fair game for the certification exams. Following the questions, you'll find the correct answers and explanatory text. We change the questions weekly.

Questions (May 18, 2001)
Answers (May 18, 2001)

Although scarce on the Windows NT exams, TCP/IP questions permeate all the Windows 2000 exams. Sometimes you find a few simple questions; other times, the correct answer depends on a piece of information about network connectivity. If you look at the exams' skills lists, you'll find they all expect a broad understanding of networks. For Win2K, that means TCP/IP and all of its related services.

For example, Exam 70-221, Designing a Microsoft Windows 2000 Network Infrastructure, is almost a direct replacement for the retired NT 4.0 TCP/IP exam (70-059). The upcoming Exam 70-226, Designing Highly Available Web Solutions with Microsoft Windows 2000 Server Technologies, will need to test TCP/IP heavily because if TCP/IP services fail, the Web server fails. Finally, Exam 70-219, Designing a Microsoft Windows 2000 Directory Services Infrastructure, must cover DNS, DHCP, and WINS because Active Directory (AD) domains depend on DNS for name resolution for everything from clients finding a server to domain controllers (DCs) finding each other. If DNS fails, your domain fails.

My next few columns will test your knowledge of TCP/IP. We'll start with some simple questions and work our way up in difficulty to some questions similar to those you'll find on the second set of core exams (i.e., the set from which you can pick your fifth core exam). Knowing TCP/IP can mean the difference between passing and failing an exam; use these questions to see whether you're ready.

Questions (May 18, 2001)

Question 1
While setting your Windows 2000 Professional machine's TCP/IP configuration parameters, you view the following TCP/IP properties:

IP Address:
Subnet Mask:
Default Gateway:
Preferred DNS Server:
Alternate DNS Server:

Which of the following statements are true? (Choose all that apply.)

  1. This TCP/IP client will be able to communicate with the primary DNS server for host name resolution.
  2. This TCP/IP client will be able to communicate with the default gateway.
  3. This TCP/IP client will be able to communicate with the alternate DNS server for host name resolution.
  4. This TCP/IP client will be able to communicate with all TCP/IP hosts on the same TCP/IP network.

Question 2
You're the network administrator for BFQ Architects, which has a star-bus hybrid networking topology installed. Company employees require Internet access to conduct research about their clients' companies. To support all 2000 employees, the previous network administrator configured the routing environment as follows:

  • The network has three segments:

  • The Internet connection is
  • Routing tables have only the directly attached network segments.
  • The default gateways for clients point to a local gateway.

Employees whose machines are connected to segment can't access the Internet. Employees whose machines are connected to segments and can connect to the Internet. Employees on segment can communicate with hosts on segments and Employees on segments and can communicate with hosts on; however, hosts on segment can't.

Why can't employees on segment connect to the Internet?

  1. All of the hosts in the network use different subnet masks that make all network client requests to the remote networks go through the default gateways.
  2. Hosts on segment don't have a default gateway configured to return responses to clients on segment
  3. The network configuration uses a default gateway routing solution.
  4. The router configuration includes routing table entries that have incorrect subnet masks associated with each network segment.

Question 3
Mary, a senior consultant, has been assigned to help plan the TCP/IP networking scheme for ABC Company. Currently, ABC has 20 branch offices, each with two network segments per branch. Each branch is connected to the ABC corporate office in Chicago to facilitate data replication between the local branch client databases and the master client database. The ABC corporate office currently has an IT network segment, a Research and Development network segment, a Sales and Marketing network segment, and a Finance network segment.

The largest of these segments supports 450 users. ABC Company is forecasting tremendous growth over the next 5 years. It expects that the current network segment count will grow to 77 networks and that the largest network segments will support 1000 hosts.

ABC's goal is to use one base network number to create the correct number of IP network addresses to associate to each network segment. ABC has charged Mary with completing this task, and she has secured an IP network address of from an ISP.

Based on this address, which IP network number(s) below will support both the future number of network segments and the growth in the number of hosts per segment?

  1. 255 supports 254 networks and 254 hosts per network.
  2. 254 supports 126 networks and 510 hosts per network.
  3. 252 supports 62 networks and 1022 hosts per network.
  4. 248 supports 30 networks and 2046 hosts per network.
  5. No answer is correct.

Answers (May 18, 2001)

Answer to Question 1
The correct answers are A—This TCP/IP client will be able to communicate with the primary DNS server for host name resolution; and D—This TCP/IP client will be able to communicate with all TCP/IP hosts on the same TCP/IP network.

The client won't be able to use its configured default gateway (answer B) because the identified IP address is for a different IP network segment. This fact also prevents the client from using the alternate DNS server for name resolution (answer C).

Answer to Question 2
The correct answer is C—The network configuration uses a default gateway routing solution. The default gateway solution, where the router doesn't have any routing table entries other than the immediate networks to which it is configured, allows for only a maximum hop of two networks from the source network.

Answer to Question 3
The correct answer is E—No answer is correct. In this case, no way exists to subdivide the network range to meet ABC's criteria of 77 networks and 1000 hosts.

Answers A and B can support the largest number of network IDs; however, the number of hosts supported for each network is less than the future growth target of 1000 hosts maximum on a network segment. Answers C and D can support the largest number of IP hosts per segment; however, the number of networks that can be created with a custom subnet mask doesn't meet the growth of networks within the 5-year period.

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