单选题：当A类IP地址34．0．0．0使用8个二进制位作为子网地址时，它的子网掩码为( )。

题目内容：

当A类IP地址34．0．0．0使用8个二进制位作为子网地址时，它的子网掩码为( )。 A．255．0．0．0
B．255．255．0．0
C．255．255．255．0
D．255．255．255．255

参考答案：

答案解析：

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