IP地址211.81.12.129/28的子网掩码可写为()A.255.255.255.192B.255.255.255.254C.255.255.255.240D.255.255.255.248

IP地址211.81.12.129/28的子网掩码可写为()

A.255.255.255.192

B.255.255.255.254

C.255.255.255.240

D.255.255.255.248


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