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?（）

发布日期：2020-04-11

The IP addresses are configured incorrectly.

Frame Relay LMI messages not displayed in real time.

The administrator must issue the enable frame-relay lmi debug command.

The administrator must issue the terminal monitor command.

Debug messages can only be received once through the console port.

The administrator must issue the show frame-relay lmi vty 0 4 command

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