單項(xiàng)選擇題在路由器中如何判斷從路由器到BSC的連接是正常的?()

A.show ip interface brief ,相應(yīng)TIMESLOT的LINE和PROTOCOL都是UP的
B.show ip interface brief,相應(yīng)TIMESLOT的LINE UP,PROTOCOL DOWN
C.show ip interface brief,相應(yīng)TIMESLOT的LINE DOWN PROTOCOL DOWN


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