Which Junos operational command displays all operational IS-IS neighbors?

The command that displays all operational IS-IS neighbors is "show isis neighbors". When executed, this command provides an overview of the neighboring routers that are part of the IS-IS routing protocol. It includes essential information such as the neighbor's system ID, the interface through which the router is connected, and the status of the adjacency.

This command is specifically designed to show the operational state of IS-IS neighbors, allowing network engineers to quickly verify the adjacency status and troubleshoot any issues related to neighbor relationships. It is essential for ensuring that IS-IS is functioning correctly and that all intended neighbors are reachable.

Other commands, while related to the IS-IS protocol, serve different purposes. For example, the command that checks interfaces will provide details about IS-IS status at the interface level, whereas the database command shows the contents of the IS-IS link-state database. Lastly, the adjacency command, while similar in name, would not typically be used as an operational command in the same context for displaying neighbors. Thus, "show isis neighbors" is the appropriate choice for confirming operational IS-IS neighbors.