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17.    B. The responsibilities of the Network layer include logical network addressing and routing. The Application, Data Link, and Physical layers do not provide any routing functionality. Please see Chapter 2 for more information.

18.    A. The only address that is correct is ::000F:ABCD:0003. Option C is an IPv4 address and the other two are bogus addresses. Please see Chapter 3 for more information.

19.    C. The server is configured to run only IPX/SPX, but the clients are using only TCP/IP. Changing the protocol to TCP/IP on the server would solve the problem. Please see Chapter 10 for more information.

20.    B. Clustering is the method by which multiple copies of a server run together. The load is balanced across all of them. If one should happen to fail, the others continue to run as if nothing happens. Please see Chapter 9 for more information.

21.    A. Because DSL operates at speeds higher than typical serial port speeds, a NIC is required in order for the PC to communicate with the DSL modem. None of the other items are required. Please see Chapter 1 for more information.

22.    D. UDP (not TCP) port 53 is used for DNS. All others, while possibly valid port numbers, are not used for DNS. Please see Chapter 3 for more information.

23.    B, C. Because Windows NT and 2000 use the NTFS that has local security properties, they have those properties as well. Please see Chapter 5 for more information.

24.    D. An ISDN B channel, or Bearer channel, typically carries 64Kbps. Please see Chapter 7 for more information.

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