局域网中某主机的IP地址为202.116.1.12/21,该局域网的子网掩码为()。
A.255.255.255.0
B.255.255.252.0
C.255.255.248.0
D.255.255.240.0

相关专题: 局域网  

答案如下:
C解析:根据培训教材中的快速IP地址计算方法可知。X=256-(2^3)=248.

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