What command would you use to revert a Cisco switch interface back to its original state?

Using the "default interface" command on a Cisco switch interface is the right choice when aiming to revert the interface back to its original factory settings. This command effectively removes any configurations that were applied to the interface, restoring it to its default state. This can be particularly useful when a number of changes have been made to an interface and you want to clear those configurations without needing to manually remove each one.

When this command is executed, specific parameters of the interface such as VLAN assignments, speed settings, and other configuration changes are reset to their factory defaults. This is crucial in a networking environment, particularly when troubleshooting or preparing an interface for a new configuration.

Other options like "reset commands," "reset interface," and "no changes" do not represent valid IOS commands for reverting configuration changes on a switch interface. "Reset commands" and "reset interface" may imply a similar concept but do not exist as valid commands within the Cisco IOS syntax, and "no changes" would not initiate any action on the interface configuration. The "default interface" command is the precise command to reset an interface to its original state, making it the correct answer.