I’ll assume you don’t know how to change modes in Cisco iOS environment.
There are three modes:
User EXEC mode – Basic monitoring – Prompt looks like: Switch>
Privileged EXEC mode – Access to other router commands – Prompt looks like: Switch#
Global configuration mode – Commands that affect the entire system – Prompt looks like: Switch (config)#
Moving between modes looks like this:
Router>enable (Allows access from user EXEC to privileged EXEC mode)
Router#disable (Reverts to user EXEC from privileged EXEC mode)
Router#configure terminal (Changes to global configuration mode from privileged mode)
Router(config)#exit (Exits from any configuration mode to privileged mode (Ctrl+Z is keyboard shortcut)
Router(config)#interface <int> (Changes to interface configuration mode from global configuration mode, you can configure ports, vlans…)
Router(config)#interface <subint> (Enters subinterface configuration mode from global configuration mode)
Router(config)#line <line> (Enters line configuration mode from global configuration mode, configures virtual terminal line)
Router(config)#router ospf 2 (Enters router configuration mode from global configuration mode)
That’s it for a start. Check my other Cisco Basics articles if you are interested to learn something about Cisco.