题目内容
有 4 个网络地址：192.168.224.1、192.168.223.255、192.68.232.25 和 192.168.216.5.如果子网掩码为 255.255.240.0，则这 4 个地址分别属于（50 ）个子网。下面列出的地址对中，属于同一个子网的是（51 ）。50A.1B.2C.3D.451A.192.168.224.1 和 192.168.223.255B.192.168.223.255 和 192.68.232.25C.192.68.232.25 和 192.168.216.5D.192.168.223.255 和 192.168.216.5
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