下列关于IPv4地址的描述中错误是_________。

A、每一个IP地址都由网络地址和主机地址组成
B、A类地址的默认子网掩码为25525500
C、IP地址的总长度为32位
D、一个C类地址拥有8位主机地址,可给254台主机分配地址
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正确答案:

B

答案解析:

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Amanbecamemorecivilized

Bsmithsbegantolookafterlandorcattleintheirsparetime

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