Which command is NOT used on the console to lock in access?

The command "enable" is primarily used to enter privileged EXEC mode within Cisco IOS. In this mode, a user can execute commands that are not available in user EXEC mode, providing access to more powerful functions including configuration options. While it is a crucial command for obtaining higher-level permissions, it does not specifically relate to locking in access for console connections.

On the other hand, the commands "line con 0," "password cisco," and "login" are directly involved in securing console access. "Line con 0" designates the configuration of the console line, "password cisco" sets a password that must be entered to access the console, and "login" enables the password checking process. These three commands work together to secure access to the device by requiring users to authenticate themselves before gaining access to the configuration interface. Hence, "enable" is distinct from these commands in its purpose and function, making it the correct choice for the command not used for locking in access on the console.