User Exec Mode (User Mode): User Mode is the first mode a user has access to after logging into the router. The user mode can be identified by the > prompt following the router name. this mode allows the user to execute only the basic commands, such as those that show the systems status. The router cannot be configured or restarted from this mode.

The user mode can be identified as Router>

Privileged EXEC mode ( Privileged mode): Privileged mode allows users to view the system configuration, restart the system, and enter router configuration mode. The privileged mode also allows all the commands that are available in user mode. The privileged mode can be identified by the # prompt following the router name. from the user mode, a user can change to Privileged mode by running the “enable” command. Also, we can keep a enable password or enable secret to restrict access to Privileged mode. An enable secret password uses stronger encryption where it is stored in the configuration file and it is safer.

The Privileged mode can be identified as Router#

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Global Configuration Mode: This mode allows the user to modify the running system configuration. From the Privileged mode, a user can move to configuration mode by running the “configure terminal” from privileged mode. To exit the configuration mode, the user can enter the “end” command or press the ctrl-z key combination.

The Global Configuration mode can be identified as Router(config)#

Configuration modes and sub-modes: From the global configuration modes you can access various configuration modes or modes. For example, to configure an interface on your device, you would have to access the mode of that interface. The interface mode contains commands relevant to the interface being configured. For example, to access the interface mode for the Fast Ethernet interface on a Cisco router, type the interface FastEthernet 0/0 command from the global configuration mode

The sub-modes can be identified as Router(config-if)

To exit this mode, the user can enter the “end” command or press the ctrl-z key combination.

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