子网掩码主机算法

http://wenku.baidu.com/view/2aa76cc6aa00b52acfc7ca6f.html很容易理解。

下面就来以实例来说明子网掩码的算法：对于无须再划分成子网的IP地址来说，其子网掩码非常简单，即按照其定义即可写出：如某B类IP地址为 10.12.3.0，无须再分割子网，则该IP地址的子网掩码为255.255.0.0。如果它是一个C类地址，则其子网...

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