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Boot process, GRUB, systemd targets, root password reset, recovery from broken fstab, and journal analysis. Roughly 15% of the EX200 exam.
BIOS/UEFI → GRUB2 → kernel → systemd target. Change the default target, edit kernel parameters, and isolate targets at runtime.
The classic RHCSA "I forgot the root password" recovery, plus rescuing from a broken /etc/fstab that drops you into emergency mode.
Read the systemd journal with journalctl — filter by unit, boot, priority, and time window. Enable a persistent journal across reboots.