Which command is used to verify configuration syntax without actually applying the changes?

The command used to verify configuration syntax without applying the changes is "commit check." This command is particularly useful in a Juniper device environment as it allows administrators to ensure that any changes made to the configuration are syntactically correct before they are committed to the system. By running this command, the system checks the current configuration for errors and provides feedback, which helps to prevent misconfigurations that could impact network operations.

Understanding the role of "commit check" is crucial for maintaining network stability, as it serves as a safeguard against applying erroneous configurations that could lead to downtime or unforeseen issues. This command gives network engineers the confidence to validate their configurations before committing them, ensuring that only well-formed configurations are put into effect.