Which command prompts an ERX Edge Router to go into a loopback mode on T1 number 1 when a command is received from a remote ERX Edge Router?（） 
- A、A
- B、B
- C、C
- D、D
正确答案:A
答案解析:有
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Which command prompts an ERX Edge Router to go into a loopback mode on T1 number 1 when a command is received from a remote ERX Edge Router?（）
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