單項(xiàng)選擇題

當(dāng)學(xué)生A用兩臺(tái)Star—R2624路由器在做路由器廣域網(wǎng)口連通實(shí)驗(yàn)時(shí)誤將本端口路由器V.35線纜的插頭插倒了。結(jié)果發(fā)現(xiàn)PING直連的路由器不通,請(qǐng)問此時(shí)需要查看路由器的狀態(tài)應(yīng)該是()

A、Serial 0 is up,line protocol is down
B、Serial 0 is down,line protocol is down
C、Serial 0 is down,line protocol is up
D、Serial 0 is administratively down,line protocol is

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