You physically cable access to the switch, are not prompted for a password, and can access the IOS. This is the default operation.

You access the IOS by using another intermediary device over an unsecure network connection.

You use a password-encrypted connection to remotely access a device over a secure network connection.

Your manager gives you a rollover cable and tells you to use it to configure the switch.

You are in the equipment room with a new switch that needs to be configured.