Which command displays the configured description of each interface on a router?

The command that displays the configured description of each interface on a router is indeed the one that specifically shows detailed information about interface descriptions. The "show interfaces description" command provides a straightforward output that lists each interface along with its description if one has been configured. This can be particularly useful for network administrators who want to quickly identify the purpose of each interface based on its description, improving management and troubleshooting efficiency.

In contrast, other commands serve different purposes. For example, "show interfaces status" provides a general status overview of all interfaces, including their administrative and operational states, but does not specifically focus on interface descriptions. The "show ip interface brief" command offers a summary of interfaces and their IP configurations, including a brief list of the status and protocols but also lacks detailed description information. Lastly, "show run interfaces" displays the running configuration of the router but is more verbose and includes all types of configurations rather than specifically highlighting interface descriptions alone.