在IPv4中，如果将一个C类网络划分子网，每个子网最少容纳50台主机，则最多可以划分子网数为______。
- A.2
- B.8
- C.4
- D.16
正确答案及解析
正确答案
解析
本题考查IP地址划分子网知识。一个C类IP地址只用1字节表示主机地址，网络标识长度为24位，主机标识长度为8位。如果要划分子网，即把主机标识中部分用网络标识，以扩大网络数量，但每个网络中主机数会相应减少。每个子网最少容纳50台主机，至少需要6位（50介于2^5和2^6之间）才能实现，因此，最多可以划分子网数位数为2，子网数为2^2=4。
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