单选题In order to troubleshoot an issue with the Testking frame relay network, you log into a remote router via a telnet session and issue the command "debug frame-relay lmi". After a long wait, you fail to see any output. What could be the cause of this problem?（）AThe IP addresses are configured incorrectly.BFrame Relay LMI messages not displayed in real time.CThe administrator must issue the enable frame-relay lmi debug command.DThe administrator must issue the terminal monitor command.EDebug messages can only be received once through the console port.FThe administrator must issue the show frame-relay lmi vty 0 4 command
单选题
In order to troubleshoot an issue with the Testking frame relay network, you log into a remote router via a telnet session and issue the command "debug frame-relay lmi". After a long wait, you fail to see any output. What could be the cause of this problem?（）
A
The IP addresses are configured incorrectly.
B
Frame Relay LMI messages not displayed in real time.
C
The administrator must issue the enable frame-relay lmi debug command.
D
The administrator must issue the terminal monitor command.
E
Debug messages can only be received once through the console port.
F
The administrator must issue the show frame-relay lmi vty 0 4 command
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