Which command displays the results of a loopback test you executed on a CT3 line module in slot 5, port 0, t1 number 4?（）

单项选择题Which command is used on the local router to invoke a loopback mode on a remote ERX Edge Router?（）

A.A
B.B
C.C
D.D

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

单项选择题Which control expression must be the last line in all macros?（）

A.A
B.B
C.C
D.D

单项选择题Which command is used to execute a macro called setup.mac ?（）

A.A
B.B
C.C
D.D

单项选择题Which configuration command removes all log filters currently configured on the ERX Edge Router?（）

A.A
B.B
C.C
D.D