2. 计算机
  3. You have a class C network, and you need to design it for 5 usable subnets with each subnet handling a minimum of 18 hosts each.

You have a class C network, and you need to design it for 5 usable subnets with each subnet handling a minimum of 18 hosts each.

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问题 You have a class C network, and you need to design it for 5 usable subnets with each subnet handling a minimum of 18 hosts each. Which of the following network masks should you use?
选项 A、225.225.224.0.
B、225.225.240.0.
C、225.225.255.0.
D、255.255.255.224
E、225.225.255.240
答案D
解析 Explanation:
The default subnet mask for class C network is 255.255.255.0. If one has to create 5 subnets, then 3 bits are required. With 3 bits we can create 8 subnets. The remaining 5 bits are used for Hosts. One can create 30 hosts using 5 bits in host field. This matches with the requirement.

Incorrect Answers:
A, B: This is an illegal subnet mask for a class C network, as the third octet can not be divided when using a class C network.

C: This is the default subnet mask for a class C network. It provides for one network, with 254 usable host IP addresses.

E: This subnet mask will provide for 14 separate networks with 14 hosts each. This does not meet the requirement of a minimum of 18 hosts.
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