What should you do if you need to review configuration changes in Junos before applying them?

Using candidate configuration is the correct approach to review configuration changes in Junos before applying them. The candidate configuration is an intermediary area where changes can be made and reviewed without impacting the currently running configuration, known as the active or committed configuration. This allows administrators to make multiple changes, assess their impact, and ensure everything is as intended before committing those changes to the device.

The candidate configuration effectively serves as a staging area, where you can validate settings and test new configurations before they become part of the actual running environment. This capability is essential for preventing errors that could disrupt network operations.

The other options do not fulfill the same purpose of reviewing configuration changes before they are applied. Checking set view provides a way to see what configurations can be set, but it does not allow for a review of pending changes. Operational mode typically allows you to check device status and performance rather than review what configuration changes are pending. Accessing user configuration logs can provide a history of changes made, but it would not help in reviewing potential changes before application. Thus, candidate configuration stands out as the crucial tool for pre-application review.