Linux Boot Process 4

Question 1

Which systemd command shows the time taken by each unit during the last boot?

Accepted Answer

systemd-analyze blame

Answer

systemd-analyze blame lists units sorted by initialization time, useful for diagnosing slow boots.

Question 2

What is the function of the /etc/fstab file during the boot process?

Accepted Answer

It specifies filesystems to mount at boot

Answer

/etc/fstab defines filesystems and their mount points, mount options, and whether they should be checked/mounted at boot.

Question 3

Which GRUB2 command at the GRUB command prompt loads a Linux kernel file?

Accepted Answer

linux /boot/vmlinuz-<version>

Answer

The 'linux' command in GRUB2 specifies the kernel image path and optional kernel parameters before booting.

Question 4

What happens when the Linux kernel detects a kernel panic during early boot?

Accepted Answer

It halts and displays an error message, awaiting manual reboot

Answer

By default a kernel panic halts the system and displays diagnostic info; automatic reboot on panic requires kernel.panic sysctl to be set.

Question 5

In UEFI booting, where does the firmware look for the bootloader by default?

Accepted Answer

/boot/efi/EFI/BOOT/BOOTX64.EFI on the EFI System Partition

Answer

UEFI firmware searches the EFI System Partition for a fallback bootloader at EFI/BOOT/BOOTX64.EFI on x86-64 systems.

Linux Practice Test