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?（）
- 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
正确答案:D
答案解析:有
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