单项选择题
A.节约IP地址B.提高IP地址使用效率C.减少路由项D.提高网络可靠性
A.64.104.3.7/28B.64.104.3.64/26C.64.104.3.16/28D.64.104.3.192/26
A.255.255.255.224B.255.255.255.240C.255.255.255.248D.无合适的子网掩码
A.172.0.4.0B.172.0.4.255C.172.0.5.255D.172.0.8.0
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