LFCS Certification LFCS Boot Process and System Initialization 3

Question 1

Which kernel parameter boots a systemd system into an emergency shell with only the root filesystem mounted read-only?

Accepted Answer

systemd.unit=emergency.target

Answer

emergency

Answer

init=emergency

Answer

rescue=1

Question 2

What does the `rd.break` kernel parameter do when added to the GRUB boot line?

Accepted Answer

Drops to a shell in the initramfs before the root filesystem is mounted read-write

Answer

Breaks into the GRUB command prompt

Answer

Enables verbose debug logging to the console

Answer

Skips all fsck checks during boot

Question 3

After chrooting into /sysroot to reset the root password on an SELinux system, which command ensures file contexts are relabeled on next boot?

Accepted Answer

touch /.autorelabel

Answer

restorecon -Rv /

Answer

semanage relabel

Answer

setenforce 0

Question 4

What does the command `systemctl --failed` display?

Accepted Answer

Systemd units that have entered a failed state

Answer

Failed SSH login attempts

Answer

Disk I/O failure events

Answer

Failed network interface initializations

Question 5

Which log file stores kernel ring buffer messages written during boot on most Linux distributions?

Accepted Answer

/var/log/dmesg

Answer

/var/log/boot.log

Answer

/var/log/kern.log

Answer

/var/log/messages

Question 6

What command prints kernel ring buffer messages, often used to diagnose hardware detection during boot?

Accepted Answer

dmesg

Answer

bootlog

Answer

journalctl -b

Answer

klog