单项选择题
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
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单项选择题
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
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