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  3. You have a class B network with a 255.255.255.0 mask. Which of the statements below are true of this network? (Select all valid

You have a class B network with a 255.255.255.0 mask. Which of the statements below are true of this network? (Select all valid

admin2009-05-19  28
问题 You have a class B network with a 255.255.255.0 mask. Which of the statements below are true of this network? (Select all valid answers)
A. There are 254 usable subnets.
B. There are 256 usable hosts per subnet.
C. There are 50 usable subnets.
D. There are 254 usable hosts per subnet.
E. There are 24 usable hosts per subnet.
F. There is one usable network.
选项
答案A,D
解析 Explanation:
The default subnet mask for Class B is 255.255.0.0. Thus an extra 8 bits have been used for the network portion, leaving 8 for hosts. The 2n - 2 formula (28 - 2 in this case for both the network and IP hosts) gives us 254 networks and 254 hosts per network.

Incorrect Answers:
B: We must remember to always subtract 2 (one for the network, and one for the broadcast) so the result is 254, not 256.

C, E: No possible network mask would give us this exact number of subnets or hosts.

F: This would be true if this were a class C network, not a class B.
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