What is the result of the command 'copy running-config startup-config'?

The command 'copy running-config startup-config' is essential for saving the current active configuration on a Cisco device. When this command is executed, it copies the configuration that is currently in the device's memory (the running configuration) to the non-volatile memory (the startup configuration).

This is crucial for ensuring that any changes made to the configuration will not be lost once the device is restarted. If a device is rebooted, it loads its configuration from the startup-config stored in non-volatile memory. Therefore, by using this command, you effectively safeguard the current settings, making it the correct result of the command.

In contrast, the other options do not accurately describe the outcome of the command. For example, losing the configuration on restart is not the case if the command is executed correctly; the configuration will persist. Additionally, the command does not cause an immediate reboot of the device, nor does it wipe configurations—both of which confirm the correctness of saving the current configuration as the intended function of the command.