單項選擇題

路由器查看端口狀態(tài),下面()表示物理線路有問題(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 protocol is up
D.S0/3/0 is administratively down,line protocol is down

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