What command is used to display a message when a router is accessed?

The command to display a message when a router is accessed is "banner motd #", which is designed to set the Message of the Day (MOTD). This command allows network administrators to present a specific message to anyone who accesses the router, typically used for legal disclaimers, warnings, or general information about the use of the device.

When this command is executed, it opens up a prompt where the administrator can input their message, which will be displayed to users upon their login to the router. The "#" symbol serves as a delimiter, indicating the start and end of the message text.

This feature is particularly useful for security and administrative purposes, as it provides important information to users regarding access policies or usage guidelines right at the moment they connect to the router, ensuring they are aware of any restrictions or expectations before proceeding.