LPIC-2 Linux Kernel and System Startup Practice Question
This LPIC-2 practice question tests your understanding of linux kernel and system startup. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.
Refer to the exhibit. The system boots successfully, but the root filesystem is mounted as read-only even after the boot process completes. Which of the following is the most likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
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 the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The kernel command line contains the 'ro' parameter, which remains in effect.
The 'ro' parameter in the kernel command line instructs the kernel to mount the root filesystem as read-only during early boot. Even after the boot process completes, if no subsequent remount (e.g., via init scripts or systemd) is performed, the root filesystem remains read-only. This is the most direct and common cause of a root filesystem staying read-only after boot.
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 kernel command line contains the 'ro' parameter, which remains in effect.
Why this is correct
The 'ro' parameter causes the root filesystem to be mounted read-only unless remounted rw by init.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The root device /dev/mapper/vg-root does not exist.
Why it's wrong here
The boot log shows the filesystem was mounted successfully, so the device exists.
✗
The root filesystem is damaged and forces read-only mount.
Why it's wrong here
No filesystem errors are shown in the log; EXT4 mounted cleanly.
✗
SELinux is enforcing and prevents write access to the root filesystem.
Why it's wrong here
SELinux does not enforce read-only mount; it controls access to files.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume a successful boot implies the root filesystem is automatically remounted read-write, overlooking that the 'ro' kernel parameter persists unless explicitly overridden by a remount command in the boot process.
Trap categories for this question
Command / output trap
The boot log shows the filesystem was mounted successfully, so the device exists.
Detailed technical explanation
How to think about this question
The kernel command line parameters are parsed by the early boot code in the kernel (init/main.c). The 'ro' parameter sets the MS_RDONLY flag for the root mount. Later, the init system (e.g., systemd or SysV init) typically runs a remount operation (e.g., 'mount -o remount,rw /') as part of the boot sequence, but if that step is skipped or fails, the root stays read-only. This is a common issue in custom embedded systems or when using minimal initramfs without proper remount logic.
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 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 exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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 kernel command line contains the 'ro' parameter, which remains in effect. — The 'ro' parameter in the kernel command line instructs the kernel to mount the root filesystem as read-only during early boot. Even after the boot process completes, if no subsequent remount (e.g., via init scripts or systemd) is performed, the root filesystem remains read-only. This is the most direct and common cause of a root filesystem staying read-only after boot.
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.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
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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