The show command is one of the most helpful commands because you can find the status of almost every feature of the Cisco IOS. One is interface configuration mode, which can be entered by running the interface FastEthernet 0/1 ( int fa0/1) configuration command. Ĭonfiguration mode contains several sub-modes. To enter configuration mode, a user executes the configure terminal ( conf t) command. Commands entered in configuration mode update the active configuration file, but the actual changes in configuration take place only after the device reboots. Unlike exec and enable mode, configuration mode accepts configuration commands - commands that tell the switch the details of what to do and how to do it.

Global configuration mode - Allows users to enter nondisruptive commands and display some information.

To enter this mode, the user runs the enable command mode.

Enable mode (privileged mode or privileged exec mode) - Allows the user to execute privileged commands, such as the reload command, which tells the switch to reboot the Cisco IOS.

Accessing the CLI by any of the three methods logs the user into Exec

Exec mode (user mode) - Allows the user to look around but not change anything.

Users can be logged in to a Cisco device using the following modes:

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Startup config is not present