The basic CLI modes that we will be referring below are as following:
When you connect to the router it will enter into User EXEC mode
Router> ← User EXEC Mode
To Enter into Privileged EXEC mode
Router> enable (if password is enabled it prompt for password)
Router# ← Privileged EXEC mode
To Enter into Global Configuration mode
In Global Configuration Mode you configure parameters that affect the whole router device
Router# Config terminal
Router(config)# ← Global Configuration Mode
To Configure any Interface
Router(config)# Interface Serial1
Router(config-if)# ← Interface Configuration Mode
To Configure Line Interface
Router(config)# line vty 0
Router(config-line)# ← Line Configuration Mode
The first step is to secure your access to the router by configuring a global secret password and also passwords for Telnet or Console
Router# Config terminal
Here we will configure the Enable Secret password for Privileged EXEC Mode
Router(config)# enable secret "secretpassword"
Router(config)# end
Configuring password for the Telnet Lines (VTY lines) which will secure your access when connecting via Telnet
Router(config)# line vty 0 4
Router(config-line)# password "Telnetpassword"
Configuring Hostname for your device
Router(config)# hostname "Routername"
Routername(config)#
