單項選擇題路由器查看端口狀態(tài),下面()表示物理和數(shù)據(jù)層都沒有問題(以S0/3/0口為例)。

A.S0/3/0 is down,line protocol is down
B.S0/3/0 is up,line protocol is down
C.S0/3/0 is up,line protoco li sup
D.S0/3/0 is administratively down,line protocol is down


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