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假设某单位有1000 台主机，则至少需分配（53）个 C 类网络，若分配的超网号为 202.25.64.0 ，则地址掩码是（54）(53)A.4 B.8 C.12 D.16(54)A.255.255.224.0 B.255.255.240.0C.255.255.248.0 D.255.255.252.0

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