Which command is used to save the running configuration to the startup configuration on a Cisco device?
Correct Answer: A
Detailed Explanation: On Cisco devices, configuration changes made in the running configuration (the active configuration in memory) are not retained after a reboot unless they are saved to the startup configuration (stored in NVRAM). The command used to save these changes is “copy running-config startup-config”. This command ensures that any modifications made to the configuration remain persistent across device reloads or power cycles. How the Command Works: When a network administrator finishes making configuration changes, issuing the command: copy running-config startup-config copies the active configuration from RAM (where the running configuration resides) to NVRAM (where the startup configuration is stored). This step is critical because if the device is rebooted without saving, all unsaved changes will be lost and the device will revert to its last saved configuration. Alternative Command – “write memory”: It is worth noting that many Cisco devices also support the command “write memory”, which performs the same function as “copy running-config startup-config”. However, for the purposes of standard CCNA exam questions, the command “copy running-config startup-config” is the most widely recognized and recommended method. In exam scenarios, this command is typically expected as the correct answer. Why Configuration Persistence is Important: Saving the configuration is a best practice for network management. It prevents loss of critical changes and ensures that the device will operate as intended after a reboot. In a production environment, unsaved configurations can lead to significant disruptions if the device reboots unexpectedly, making it essential to develop a habit of regularly saving changes. Impact on Troubleshooting and Recovery: Having an up-to-date startup configuration also aids in troubleshooting and disaster recovery. If a device fails or needs to be replaced, the startup configuration can be quickly restored to bring the device back online with minimal disruption. This consistency is vital for maintaining network stability and performance. For CCNA candidates, understanding the difference between the running and startup configurations, and knowing how to save changes properly, is fundamental. Many practical lab exercises and exam questions will involve scenarios where you must demonstrate the correct method for saving configurations. In summary, the command “copy running-config startup-config” is used to save the running configuration to the startup configuration on a Cisco device. This practice ensures that configuration changes persist after a reboot, maintaining network continuity and stability.
This CCNA practice question helps students prepare for Cisco networking certification exams by testing knowledge of network fundamentals, routing, switching, and network security concepts.