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
Which control expression must be the last line in all m...
Which control expression must be the last line in all macros?（）
Which command is used to execute a macro called setup.m...
Which command is used to execute a macro called setup.mac ?（）
Which configuration command removes all log filters cur...
Which configuration command removes all log filters currently configured on the ERX Edge Router?（）
