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关于帧中继的问题WhentroubleshootingaFrameRelayconnection,whatisthefirststepwhenperformingaloopbacktest?A.SettheencapsulationoftheinterfacetoHDLC.B.PlacetheCSU/DSUinlocal-loopmode.C.Enablelocal-loopmodeontheDCEF

题目详情
关于帧中继的问题
When troubleshooting a Frame Relay connection,what is the first step when performing a loopback test?
A.Set the encapsulation of the interface to HDLC.
B.Place the CSU/DSU in local-loop mode.
C.Enable local-loop mode on the DCE Frame Relay router.
D.Verify that the encapsulation is set to Frame Relay.
选a还是选d?
▼优质解答
答案和解析
选D,因为要做帧中继排错,所以要先检查接口是否被封装成帧中继,答案A的意思是 设置接口封装为HDLC,HDLC与帧中继是两种不同的封装方式,对帧中继排错没有任何用处,所以答案A肯定不对.