- A
Recompile the custom kernel modules against the new kernel headers and install them.
Recompiling ensures the modules match the new kernel's version magic and ABI.
- B
Use modprobe with the --force-vermagic option to bypass the version check.
Why wrong: While modprobe --force-vermagic exists, it is dangerous and may cause instability; also, the modules still may not work due to ABI differences. More importantly, the question states closed-source; recompilation is the proper method.
- C
Update the version magic string in the module binary by patching the file.
Why wrong: Patching the binary is not reliable and may violate licensing; also, ABI changes may still cause issues.
- D
Use systemd-modules-load to load the modules later in the boot process.
Why wrong: Loading time does not affect version magic; the modules will still fail at load.
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 company has a fleet of servers running a custom Linux kernel version 5.4. They have developed several in-house kernel modules that interface with proprietary hardware. Due to a security vulnerability, the company decides to upgrade all servers to kernel version 5.10. After upgrading the kernel on a test server, the custom modules fail to load with the error 'Invalid module format' or 'disagrees about version magic'. The system administrator must resolve this issue for all servers. The modules are closed-source and cannot be modified easily. The administrator considers the following options. Question: What is the most effective course of action to load the custom modules on the new kernel?
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
Recompile the custom kernel modules against the new kernel headers and install them.
Option A is correct because the custom kernel modules were compiled against the version magic string of kernel 5.4. Kernel 5.10 has a different version magic (which includes the kernel version, SMP/preemption settings, and compiler version). Recompiling the modules against the new kernel headers regenerates the correct version magic, allowing the modules to load without error. Since the modules are closed-source, recompilation is not possible in practice, but the question states the administrator considers options; recompilation is the only technically valid method to resolve the version magic mismatch.
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.
- ✓
Recompile the custom kernel modules against the new kernel headers and install them.
Why this is correct
Recompiling ensures the modules match the new kernel's version magic and ABI.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Use modprobe with the --force-vermagic option to bypass the version check.
Why it's wrong here
While modprobe --force-vermagic exists, it is dangerous and may cause instability; also, the modules still may not work due to ABI differences. More importantly, the question states closed-source; recompilation is the proper method.
- ✗
Update the version magic string in the module binary by patching the file.
Why it's wrong here
Patching the binary is not reliable and may violate licensing; also, ABI changes may still cause issues.
- ✗
Use systemd-modules-load to load the modules later in the boot process.
Why it's wrong here
Loading time does not affect version magic; the modules will still fail at load.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may think modprobe has a --force-vermagic option (Option B) or that patching the binary is straightforward (Option C), but the LPIC-2 exam expects knowledge that only recompilation against the correct kernel headers resolves version magic mismatches, and that force-loading is a temporary, risky workaround.
Detailed technical explanation
How to think about this question
The version magic string is stored in the .modinfo section of a kernel module ELF binary and includes the kernel version, SMP status, preemption model, and compiler version. The kernel's module loader compares this string at load time using the vermagic macro; a mismatch triggers the 'Invalid module format' error. For closed-source modules, the only practical workaround (short of recompilation) is to use 'insmod -f' to force load, but this is strongly discouraged in production due to potential memory corruption or security issues.
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 small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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Linux Kernel and System Startup — study guide chapter
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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: Recompile the custom kernel modules against the new kernel headers and install them. — Option A is correct because the custom kernel modules were compiled against the version magic string of kernel 5.4. Kernel 5.10 has a different version magic (which includes the kernel version, SMP/preemption settings, and compiler version). Recompiling the modules against the new kernel headers regenerates the correct version magic, allowing the modules to load without error. Since the modules are closed-source, recompilation is not possible in practice, but the question states the administrator considers options; recompilation is the only technically valid method to resolve the version magic mismatch.
What should I do if I get this LPIC-2 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Last reviewed: Jun 25, 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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