常用的网络地址有 A、B、C 三类。一个 B 类网络最多可以包含（）主机，B类网络默认的子网掩码是（）。
- A.255.0.0.0
- B.255.255.0.0
- C.255.255.252.0
- D.255.255.255.0
正确答案及解析
正确答案
解析
B类网络的默认子网掩码为/16，即255.255.0.0，因此可以包含的主机为256*256=65536个。有效主机数为65536-2=65534
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