一个B类IP地址的子网掩码是255.255.224.0，则该IP的网络可以划分的子网数为（ ）。
- A.8
- B.6
- C.4
- D.2
正确答案及解析
正确答案
解析
本题考查子网的划分问题。
在IPV4的地址中，B类地址IP地址的表示形式为前2个字节为网络号，后2个字节为主机号，（B类子网掩码为255.255.0.0）题干给出的一个B类IP地址的子网掩码是255.255.224.0，后两位并非为0，表示进行了子网划分，将第三个字节的224转换为二进制得：1110 0000，表示划分了三位，共计子网数为23=8，由于子网不能存在全0和全1的情况，故可用的子网数为8-2=6。
经计算得，本题选B。
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