When logging into a Cisco device via Telnet/SSH, you can restrict login attempts. After a certain number of failed login attempts, the login will be blocked. This prevents unauthorized login by brute force attack.
The following section describes configuration for restricting login attempts for Cisco devices.

The archive command allows you to save a configuration file at a point in time. It is then possible to roll back to the archived configuration file at a later time.

The debug command is used to check the operation of a router/switch in real time.