Because of their importance in packet forwarding, routers make attractive targets for network attacks. This section discusses some of the built-in protections you can enable to secure access to your device.
The most basic type of security is to require a password to access the router. Cisco devices use several types of passwords for access control:
Enable password: Controls access to privileged EXEC mode if the enable secret password is not present. It is stored in clear text in the configuration by default. To configure, use the global command enable password password.
Enable secret: ...