Cisco Certified Network Associate (CCNA) Practice Exam

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Study for the Cisco Certified Network Associate (CCNA) exam with our comprehensive quiz featuring multiple-choice questions and detailed explanations. Prepare effectively and enhance your understanding of networking concepts!

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Which command is used to display Frame Relay LMI messages in real-time?

#show frame-relay pvc
#debug frame-relay lmi
#show frame-relay lmi
#show frame-relay map

The correct answer is: #debug frame-relay lmi

The correct command to display Frame Relay Link Management Interface (LMI) messages in real-time is the one that initiates a debug process for Frame Relay LMI. This command shows a live stream of LMI message exchanges between the router and the Frame Relay switch, allowing for real-time monitoring and troubleshooting. Using the debug command is particularly useful when you need to observe the behavior of the LMI communication as it occurs, making it easier to identify any issues related to connectivity or configuration in a Frame Relay environment. Other commands mentioned provide valuable information about Frame Relay but focus on different aspects. For instance, the show frame-relay lmi command displays the current LMI status but does so in a non-real-time, static manner, while the show frame-relay pvc command lists the PVCs but not the real-time LMI messages. The show frame-relay map command reveals the mapping of Layer 2 addresses to Layer 3 addresses but does not focus on LMI activities specifically.