The show service-module command would be least useful for which of the following tasks?

The show service-module command primarily provides information regarding the operational status and performance metrics of services on integrated service modules, such as those that interface with CSU/DSUs and ISDN lines. It is particularly useful for monitoring device performance, verifying configurations related to ISDN, and testing line circuits to ensure they are functioning correctly.

When it comes to verifying routing protocols, the show service-module command is not focused on this area. Instead, routing protocols operate at a different layer of the network stack, and specific commands like show ip route or similar commands tailored to routing protocols would be more appropriate for that purpose. These commands provide essential information about the routing table and the status of various routes, which is critical for troubleshooting and verifying network connectivity and performance. Thus, the show service-module command would be least useful for tasks related to verifying routing protocols.