- A
The initramfs is missing the ext4 module because dracut did not include it. The administrator should run 'dracut --force --add-drivers ext4 /boot/initramfs-5.15.19.img 5.15.19' to regenerate the initramfs including the ext4 module.
Dracut may fail to detect the module; --add-drivers forces inclusion, and --force overwrites the existing initramfs.
- B
The kernel command line needs the 'rd.shell' parameter to allow interactive debugging. The administrator should add 'rd.shell' to the kernel parameter and boot again to investigate.
Why wrong: rd.shell provides a shell before root mount but does not solve the missing module problem; it only allows manual investigation.
- C
The root filesystem label or UUID is incorrect. The administrator should change the kernel command line to use 'root=LABEL=root' or 'root=UUID=...'.
Why wrong: The error indicates no root device found at all (unknown-block 0,0), not a wrong device. The device identity is correct.
- D
The kernel is missing the ext4 module because it was not compiled. The administrator should recompile the kernel with ext4 compiled directly into the kernel (y) instead of as a module.
Why wrong: The kernel config includes ext4 as a module; the module exists but is not in initramfs. Recompiling as built-in is a workaround but not best practice.
LPIC-2 Linux Kernel and System Startup Practice Question
This LPIC-2 practice question tests your understanding of linux kernel and system startup. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 system administrator has compiled a custom Linux kernel (version 5.15.19) with ext4 filesystem support built as a module. The administrator installed the kernel to /boot and built an initramfs using dracut with default options. After rebooting, the system fails with a kernel panic: 'VFS: Unable to mount root fs on unknown-block(0,0)'. The administrator confirms that the root partition is /dev/sda1 formatted as ext4 and that the kernel configuration includes the ext4 module. The kernel command line includes 'root=/dev/sda1' and 'rd.auto'. The administrator also notices that the initramfs file is only 5 MB in size, which seems smaller than expected. Which of the following is the most likely cause and best solution?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"best"Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Clue:
"most likely"Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
The initramfs is missing the ext4 module because dracut did not include it. The administrator should run 'dracut --force --add-drivers ext4 /boot/initramfs-5.15.19.img 5.15.19' to regenerate the initramfs including the ext4 module.
The small initramfs size (5 MB) suggests it does not contain the ext4 module. Dracut should have included it automatically, but may have failed. Rebuilding with --force and explicitly adding the ext4 driver ensures the module is included. Compiling ext4 into the kernel would work but is not the most efficient solution; changing the root parameter would not help because the device is correct; rd.shell would allow debugging but not fix the underlying issue.
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.
- ✓
The initramfs is missing the ext4 module because dracut did not include it. The administrator should run 'dracut --force --add-drivers ext4 /boot/initramfs-5.15.19.img 5.15.19' to regenerate the initramfs including the ext4 module.
Why this is correct
Dracut may fail to detect the module; --add-drivers forces inclusion, and --force overwrites the existing initramfs.
Clue confirmation
The clue words "best", "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
The kernel command line needs the 'rd.shell' parameter to allow interactive debugging. The administrator should add 'rd.shell' to the kernel parameter and boot again to investigate.
Why it's wrong here
rd.shell provides a shell before root mount but does not solve the missing module problem; it only allows manual investigation.
- ✗
The root filesystem label or UUID is incorrect. The administrator should change the kernel command line to use 'root=LABEL=root' or 'root=UUID=...'.
Why it's wrong here
The error indicates no root device found at all (unknown-block 0,0), not a wrong device. The device identity is correct.
- ✗
The kernel is missing the ext4 module because it was not compiled. The administrator should recompile the kernel with ext4 compiled directly into the kernel (y) instead of as a module.
Why it's wrong here
The kernel config includes ext4 as a module; the module exists but is not in initramfs. Recompiling as built-in is a workaround but not best practice.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
- Use explanations to understand the rule behind the answer.
TExam Day Tips
- Underline the problem statement mentally.
- 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 LPIC-2 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.
What to study next
Got this wrong? Here's your next step.
Identify which LPIC-2 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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FAQ
Questions learners often ask
What does this LPIC-2 question test?
Linux Kernel and System Startup — This question tests Linux Kernel and System Startup — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The initramfs is missing the ext4 module because dracut did not include it. The administrator should run 'dracut --force --add-drivers ext4 /boot/initramfs-5.15.19.img 5.15.19' to regenerate the initramfs including the ext4 module. — The small initramfs size (5 MB) suggests it does not contain the ext4 module. Dracut should have included it automatically, but may have failed. Rebuilding with --force and explicitly adding the ext4 driver ensures the module is included. Compiling ext4 into the kernel would work but is not the most efficient solution; changing the root parameter would not help because the device is correct; rd.shell would allow debugging but not fix the underlying issue.
What should I do if I get this LPIC-2 question wrong?
Identify which LPIC-2 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Are there clue words in this question I should notice?
Yes — watch for: "best", "most likely". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
This LPIC-2 practice question is part of Courseiva's free LPI certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the LPIC-2 exam.
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