CCNA Learning Journey

Day 4 : Command Line Interface

Console port

How to connect to Device CLI?

Connect the device via console and then using the Putty in Serial connection type

User Exec mode

Router>

Privileged exec mode

Router>enable Router#

Configuration mode

Router#configure terminal Router(config)#

Enable password

(config)# enable password myPassword

Router#exit : to exit mode

Running-config / Startup-config

• There are two separate config file present on the device at once.
• Running-config:
  • the current, active configuration file on the device. As we enter commands in CLI, we edit the active configuration.
• Startup-config:
  • the configuration file that will be loaded upon restart of the device.

Show running-config / Show startup-config

Router#show running-config

Saving the configuration

3 Ways:

• Router#write
• Router#write memory
• Router#copy running-config startup-config

Service password-encryption

Router(config)#service password-encryption

Router(config)#enable secret myNewpassword (Password kept using enable secret is always encrypted.)

Router(config)#do sh run

• Here “do” is used to run exec mode command to run in config mode.

Router(config)# run priviledged-exec-level-command

• executes a privileged-exec-level command from global configuration mode

Router(config)# no command

• removes the command that we previously configured