TestOut Linux Pro 2025 – 400 Free Practice Questions to Pass the Exam

When the command 'systemctl set-default rescue.target' is executed, it configures the system to boot into rescue mode by default. The rescue target is a special systemd target that provides a minimal environment, typically used for system recovery and troubleshooting. In this mode, the system runs with a single-user instance, allowing for maintenance tasks without other users or processes interfering.

This command alters the default boot target, meaning each time the system is rebooted, it will start in the rescue mode until it is changed again with a different target. This is particularly useful for diagnosing problems or repairing systems where a typical multi-user or graphical environment might not be functioning correctly.

Other choices do not reflect the function of 'rescue.target.' While multi-user mode allows multiple users and services, it does not restrict to single-user access provided by rescue mode. Similarly, graphical mode enables a graphical user interface which isn't relevant here. Lastly, the command does not trigger an immediate reboot but simply sets a configuration that takes effect on the next boot.