Setting Up Passwords on Cisco Router

Setting password to protect Console Port
To configure the console password, follow these steps.
Router#config □ t
Router(config)# line □ console □ 0
Router(config-line)# password □ CISCO
Router(config-line)# login
How to password protect Auxilary (AUX Port) Port
To configure the auxilary password, follow these steps.
Router#config □ t
Router(config)#line □ aux □ 0
Router(config-line)#password □ cisco
Router(config-line)#login
How to password protect VTY Ports (Telnet Ports)

Configuring the VTY password is very similar to doing the Console and Aux ones. The only difference is that there are 5 VTY virtual ports, which are named 0, 1, 2, 3, and 4. You can use the shortcut 0 4 (a zero, a space, and 4) to set all 5 passwords at the same time. To configure the VTY password, follow these steps.

Router#config □ t
Router(config)#line □ vty □ 0 □ 4
Router(config-line)#password □ cisco
Router(config-line)#login
How to password protect Privileged Mode
The Enable Password is the old form of the password for “Privileged Mode”. Here the password is stored un-encrypted.
Router#config □ t
Router(config)#enable □ password □ cisco
Enable Secret provides better security since password is kept encrypted.
Router#config □ t
Router(config)#enable □ secret □ cisco