Which system-defined user class is able to perform all operations on a device?

The super-user class is designed to have the highest level of access on the device, allowing it to execute all operational commands and configure every aspect of the system. In the context of Junos OS, the super-user possesses complete privileges, granting them the ability to perform tasks such as software upgrades, configuration changes, and detailed monitoring without any restrictions.

This level of access is essential for system maintenance and troubleshooting, allowing the super-user to manage everything from security settings to network configurations. In many systems, the super-user transcends other user roles by being able to override any restrictions typically placed on other user classes, thereby granting comprehensive control over the device's resources and settings.