某公司网络的地址是 192.168.192.0/20,要把该网络分成 32 个子网，则对应的子网掩码应该是（请作答此空） ，每个子网可分配的主机地址数是（ ）。
- A.255.255.252.0
- B.255.255.254.0
- C.255.255.255.0
- D.255.255.255.128
正确答案及解析
正确答案
解析
IPv4地址用4个字节即32位表示，前20位作为网络地址，第21至第24位为子网号（占5位），剩余第25至31位为主机号（占7位）。因此子网掩码占25位，最后一个字节的左边第一位是1，即27=128，子网掩码为255.255.255.128。主机号占7位，去掉全是0和全是1，实际为126。
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