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当前学科:高级计算机网络管理员
题目:
单选题
一个中等规模的计算机网络使用一个带有“/21”为后缀的IP地址,在所有的网段中,下面哪个可以当子网掩码()
A
255.255.254.0
B
255.255.252.0
C
255.255.248.0
D
255.255.240.0
答案:
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