Enable username and password on cisco switches & routers

To enable username and password each time user want to login into the devices:

switch(config)#username user password pass

-create the username and password for the devices

switch(config)#aaa new model

switch(config)#authentication login default local

-enable the switch to prompt the username and password to be fill in when user want to access into the devices.

user will be prompt to fill in username and password when accessing the device.