2. 计算机
  3. Ezonexam has a Class C network and you need ten subnets. You wish to have as many addresses available for hosts as possible. Whi

Ezonexam has a Class C network and you need ten subnets. You wish to have as many addresses available for hosts as possible. Whi

admin2009-05-19  53
问题 Ezonexam has a Class C network and you need ten subnets. You wish to have as many addresses available for hosts as possible. Which one of the following subnet masks should you use?
选项 A、255.255.255.192
B、255.255.255.224
C、255.255.255.240
D、255.255.255.248
E、None of the above
答案C
解析 Explanation:
Using the 2n-2 formula, we will need to use 4 bits for subnetting, as this will provide for 24-2 = 14 subnets. The subnet mask for 4 bits is then 255.255.255.240.

Incorrect Answers:
A. This will give us only 2 bits for the network mask, which will provide only 2 networks.

B. This will give us 3 bits for the network mask, which will provide for only 6 networks.

D. This will use 5 bits for the network mask, providing 30 networks. However, it will provide for only for 6 host addresses in each network, so C is a better choice.
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