This XK0-005 practice question tests your understanding of system management. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A Linux server with systemd is experiencing boot issues after a recent kernel update. Which command sequence should be used to boot into the previous kernel version?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "which command"
Why it matters: Tests specific CLI syntax. Recall the exact command and its required context — near-synonyms and partial matches are common distractors.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Interrupt the boot process, select 'Advanced options' in GRUB, then choose the previous kernel.
Option B is correct because GRUB (Grand Unified Bootloader) stores multiple kernel versions in its menu. By interrupting the boot process and selecting 'Advanced options for Ubuntu' (or similar), you can choose the previous kernel entry, which loads the older kernel and its associated initramfs. This is the standard method to recover from a failed kernel update on systems using systemd and GRUB.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Boot from a live CD and run 'rpm -Uvh --oldkernel' to revert the kernel.
Why it's wrong here
Reinstalling kernel is not a boot-time selection.
✓
Interrupt the boot process, select 'Advanced options' in GRUB, then choose the previous kernel.
Why this is correct
Allows selection of a specific kernel version from the GRUB menu.
Clue confirmation
The clue word "which command" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use 'systemctl set-default multi-user.target' and reboot.
Why it's wrong here
Sets the default target, not kernel version.
✗
Use 'grub2-set-default' with the previous kernel entry before rebooting.
Why it's wrong here
Sets default for next boot, but if already booting it's too late; interactive menu is better.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse changing the default boot target (runlevel) with selecting a different kernel version, or they assume a package manager command can revert the running kernel without understanding that the bootloader controls which kernel is loaded at startup.
Detailed technical explanation
How to think about this question
GRUB's 'Advanced options' submenu lists each installed kernel version with its own initramfs, allowing the user to boot a specific kernel without modifying persistent configuration. The boot process is interrupted by pressing Shift (BIOS) or Esc (UEFI) during GRUB's countdown, which reveals the menu. This is critical in scenarios where a kernel update introduces a regression (e.g., a driver failure or filesystem corruption) and the system must be temporarily reverted to a known-good kernel for troubleshooting.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the XK0-005 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this XK0-005 question in full detail.
System Management — This question tests System Management — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Interrupt the boot process, select 'Advanced options' in GRUB, then choose the previous kernel. — Option B is correct because GRUB (Grand Unified Bootloader) stores multiple kernel versions in its menu. By interrupting the boot process and selecting 'Advanced options for Ubuntu' (or similar), you can choose the previous kernel entry, which loads the older kernel and its associated initramfs. This is the standard method to recover from a failed kernel update on systems using systemd and GRUB.
What should I do if I get this XK0-005 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "which command". Tests specific CLI syntax. Recall the exact command and its required context — near-synonyms and partial matches are common distractors.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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