What does the command 'request system reboot' do?

The command 'request system reboot' is used to initiate a reboot of the device running Junos OS. When this command is executed, the device will restart, and any unsaved changes made to the configuration will not be applied. This includes changes that were made since the last commit. Therefore, the correct answer emphasizes that the device will reboot without saving any modifications that were not explicitly committed.

This behavior is important for maintaining intended configurations on the device, as it ensures that only deliberately saved settings take effect upon reboot. Understanding this command is crucial for administrators who need to manage their devices effectively, ensuring they are aware of the implications of rebooting without committing changes, protecting the integrity of the configuration.