单选

●子网掩码的作用是 (29) 。
(29)

A．可以识别子网 &n
bsp; B．可以区分掩码和网关
C．用来寻找网关
D．可以区分IP和MAC

试题出自试卷《2011年网络管理员考试考前密卷（一）-上午试题》

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●子网掩码的作用是 (29) 。(29)

●子网掩码的作用是 (29) 。
(29)