This LPIC-2 practice question tests your understanding of block devices, filesystems and advanced storage. 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.
A system's root filesystem on /dev/sda1 is offline. The administrator boots into rescue mode and needs to check the filesystem integrity. Which command should be used first?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "first"
Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
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.
dumpe2fs /dev/sda1
Why wrong: dumpe2fs shows filesystem superblock and blocks group info, not for integrity checking.
fsck.ext4 -f /dev/sda1
Why wrong: The -f flag forces a check even if the filesystem is marked clean, which is not the best first step.
e2fsck -p /dev/sda1
The -p (preen) option automatically fixes safe problems without prompting.
fsck -N /dev/sda1
Why wrong: The -N flag only shows what would be done without actually checking.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
e2fsck -p /dev/sda1
Option C is correct because `e2fsck -p` runs an automatic, non-interactive filesystem check on the ext2/ext3/ext4 filesystem, which is the safest first step when the root filesystem is offline and the administrator is in rescue mode. The `-p` flag automatically repairs any problems that can be safely fixed without user intervention, minimizing risk of further damage. This command is specifically designed for ext-family filesystems and is the recommended initial integrity check before attempting any manual repairs.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
dumpe2fs /dev/sda1
Why it's wrong here
dumpe2fs shows filesystem superblock and blocks group info, not for integrity checking.
fsck.ext4 -f /dev/sda1
Why it's wrong here
The -f flag forces a check even if the filesystem is marked clean, which is not the best first step.
e2fsck -p /dev/sda1
Why this is correct
The -p (preen) option automatically fixes safe problems without prompting.
Clue confirmation
The clue words "first", "which command" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
fsck -N /dev/sda1
Why it's wrong here
The -N flag only shows what would be done without actually checking.
Common exam traps
The trap here is that candidates confuse `dumpe2fs` (metadata display) or `fsck -N` (dry-run) with actual integrity checking, or they choose `fsck.ext4 -f` thinking a forced check is always best, overlooking that the `-p` (preen) mode is the standard first-step for safe, automated repair in rescue environments.
Trap categories for this question
Command / output trap
dumpe2fs shows filesystem superblock and blocks group info, not for integrity checking.
Detailed technical explanation
Under the hood, `e2fsck -p` uses the `PR_PREEN` mode, which automatically applies fixes for a predefined set of safe repairs (e.g., clearing orphaned inodes, fixing directory checksums) without requiring operator confirmation. In a real-world scenario, if the root filesystem has severe corruption, `e2fsck -p` may still fail or abort, at which point the administrator would escalate to `e2fsck -y` or manual repair with `-b` to specify an alternate superblock. The `-p` flag is the ext4 equivalent of `fsck -a` on other filesystem types, but it is specific to the e2fsprogs suite.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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
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FAQ
Block Devices, Filesystems and Advanced Storage — This question tests Block Devices, Filesystems and Advanced Storage — Read the scenario before looking for a memorised answer..
The correct answer is: e2fsck -p /dev/sda1 — Option C is correct because `e2fsck -p` runs an automatic, non-interactive filesystem check on the ext2/ext3/ext4 filesystem, which is the safest first step when the root filesystem is offline and the administrator is in rescue mode. The `-p` flag automatically repairs any problems that can be safely fixed without user intervention, minimizing risk of further damage. This command is specifically designed for ext-family filesystems and is the recommended initial integrity check before attempting any manual repairs.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Yes — watch for: "first", "which command". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
Read the scenario before looking for a memorised answer.
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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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