单项选择题
将一个B类地址网段精确的分为512个子网那么子网掩码是多少?()
A.255.255.255.252
B.255.255.255.128
C.255.255.0.0
D.255.255.255.192
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单项选择题
A.255.255.255.252
B.255.255.255.128
C.255.255.0.0
D.255.255.255.192
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