单项选择题
A.2B+D B.30B+D C.同轴电缆 D.普通电话线
A.link bandwidth B.hop count C.link cost D.administrative distance E.link delay
A.主机地址 B.网络地址 C.组播地址 D.广播地址
A.255.255.255.0 B.255.255.255.128 C.255.255.255.192 D.255.255.255.224
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