What is the default action of the Junos OS when a configuration rollback is performed?

When a configuration rollback is performed in Junos OS, the default action is to revert to the previous state. This means that the system will discard the current configuration and restore the last saved configuration from the rollback file. This capability is particularly useful for network administrators who may need to resolve issues stemming from recent configuration changes or who wish to return to a known working state.

In Junos OS, rollbacks provide a straightforward way to manage configuration changes effectively. By default, the rollback command retrieves the last configuration that was committed, allowing the administrator to quickly recover from inadvertent errors or misconfigurations. The rollback process can be executed without further prompts for confirmation, streamlining the process and allowing for immediate restoration of services.

The other options, while they may describe various actions one might expect from different systems or contexts, do not accurately reflect Junos OS's behavior during a rollback operation. For instance, immediate reconfiguration implies an ongoing adjustment to settings without reverting to a previous state, which is not what occurs with a rollback. Similarly, batch processing suggests a series of changes applied collectively, rather than returning to a former configuration. Finally, prompting for confirmation would delay the rollback process, which is not how Junos OS manages this command by default. Overall,