Cisco Certified Network Associate (CCNA) Practice Exam 2026 - Free CCNA Practice Questions and Study Guide

The command that you need to enter after changing the configuration register on a Cisco router is designed to initiate the next steps that you want the router to take upon its next initialization. When you change the configuration register value, it does not take effect until the router is rebooted. However, the specific command you would enter to effectively finalize your session and to continue to the privileged EXEC mode is crucial because it determines the operation level of the router and ensures that the desired configurations, including the boot sequence, are set correctly.

By entering the command to access privileged EXEC mode, you enable the router to recognize your changes and any other modifications you might want to make before a reboot. This command also allows you the opportunity to check current settings and confirm that everything is set as intended. Without this step, you may not be able to apply the configuration change correctly, which can lead to issues when the router starts up after a restart.

It's also notable that some other options, while relevant in different contexts, don't directly apply to the immediate action required after changing the configuration register. For instance, saving the running configuration to the startup configuration with a different command is often important in many scenarios, but it is not the immediate requirement following a change to the configuration register.