Basic router security includes but not limited to:
- Configuring an enable secret
configure terminal enable secret 'password'
- Secure passwords
configure terminal service password-encryption
- Displaying a motd
configure terminal banner #motd# banner #login#
- Locking down the console port
configure terminal line console 0 password 'password' login
- Configuring terminal lines for remote access
configure terminal line vty 0 4 password 'password' login transport input telnet ssh (remove telnet for ssh only)