How to Modify Configuration on a Cisco Router Using Command Line Interface (CLI)

What will a network administrator use to modify a configuration on a Cisco router?

A network administrator would typically use the Command Line Interface (CLI) to modify configuration on a Cisco router.

The CLI provides a text-based interface that allows administrators to interact with the router and perform various configuration tasks.

To modify the configuration on a Cisco router using CLI, the administrator would establish a connection to the router through a terminal emulator software such as PuTTY or SecureCRT.

The administrator would then enter specific commands to access the router’s configuration mode, make changes to the configuration, and save the configuration.

Here are the general steps to modify the configuration on a Cisco router:

1. Connect to the router: Establish a connection to the router using a terminal emulator and connect to its management interface (such as console or remote access via SSH or Telnet).

2. Access privileged mode: After logging in, the administrator needs to access privileged EXEC mode by entering the “enable” command and providing the appropriate password if required.

3. Enter configuration mode: Once in privileged mode, the administrator can enter the global configuration mode by typing “configure terminal” or “conf t”. This mode allows the administrator to make changes to various configurations on the router.

4. Modify configuration: In the configuration mode, the administrator can use various commands to modify specific settings on the router. For example, they can change interface configurations, set up routing protocols, configure access control lists (ACLs), or enable/disable specific features.

5. Save the configuration: After making the desired changes, the administrator should save the modified configuration to non-volatile memory to ensure the changes persist across router reboots. This can be done by typing the “write” or “copy running-config startup-config” command.

It’s important for network administrators to have a good understanding of the Cisco IOS (Internetwork Operating System) command syntax and the specific configurations they want to modify. Cisco’s official documentation and network administrator guides provide detailed information on specific commands and configurations for different Cisco router models.

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