单选题如果对TDCS协议转换器打环，显示“line protocol is up（looped）”，则表示（）。A打环成功，路由器正常B路由器故障C协议故障D通信正常
单选题
如果对TDCS协议转换器打环，显示“line protocol is up（looped）”，则表示（）。
A
打环成功，路由器正常
B
路由器故障
C
协议故障
D
通信正常
参考解析
解析：
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