- A
Identify the UUID using blkid, create the mount point directory, add an entry to /etc/fstab using the UUID with options defaults and dump/pass values, then run mount -a to test.
This is correct because using a UUID ensures the drive is mounted persistently regardless of device name changes, and testing with mount -a verifies the configuration before a reboot.
- B
Plug in the USB drive, create the mount point, add an entry to /etc/fstab using the device name (e.g., /dev/sdb1), then reboot without testing.
Why wrong: This is incorrect because using a device name like /dev/sdb1 is not persistent; the drive may get a different name on reboot, causing mount failure. Also, rebooting without testing risks a boot hang if the fstab entry is invalid.
- C
Run mount -a first, then edit /etc/fstab to add the entry using UUID, and finally create the mount point.
Why wrong: This is incorrect because mount -a will fail if no mount point exists or the fstab entry is missing. The correct order requires creating the mount point and editing fstab before testing.
- D
Add an entry to /etc/fstab using the device name, manually mount with mount command, then create the mount point after mounting.
Why wrong: This is incorrect because the mount point must exist before mounting. Also, using a device name makes the mount non-persistent, and creating the mount point after mounting is logically impossible.
How to Mount an ext4 Filesystem at Boot
This LFCS practice question tests your understanding of essential commands. 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.
Order the steps to mount an ext4 filesystem from an external USB drive automatically at boot.
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
Identify the UUID using blkid, create the mount point directory, add an entry to /etc/fstab using the UUID with options defaults and dump/pass values, then run mount -a to test.
Using UUID in fstab ensures persistent mounting; testing with mount -a verifies no errors.
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.
- ✓
Identify the UUID using blkid, create the mount point directory, add an entry to /etc/fstab using the UUID with options defaults and dump/pass values, then run mount -a to test.
Why this is correct
This is correct because using a UUID ensures the drive is mounted persistently regardless of device name changes, and testing with mount -a verifies the configuration before a reboot.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Plug in the USB drive, create the mount point, add an entry to /etc/fstab using the device name (e.g., /dev/sdb1), then reboot without testing.
Why it's wrong here
This is incorrect because using a device name like /dev/sdb1 is not persistent; the drive may get a different name on reboot, causing mount failure. Also, rebooting without testing risks a boot hang if the fstab entry is invalid.
- ✗
Run mount -a first, then edit /etc/fstab to add the entry using UUID, and finally create the mount point.
Why it's wrong here
This is incorrect because mount -a will fail if no mount point exists or the fstab entry is missing. The correct order requires creating the mount point and editing fstab before testing.
- ✗
Add an entry to /etc/fstab using the device name, manually mount with mount command, then create the mount point after mounting.
Why it's wrong here
This is incorrect because the mount point must exist before mounting. Also, using a device name makes the mount non-persistent, and creating the mount point after mounting is logically impossible.
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 LFCS 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 LFCS 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 LFCS question test?
Essential Commands — This question tests Essential Commands — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Identify the UUID using blkid, create the mount point directory, add an entry to /etc/fstab using the UUID with options defaults and dump/pass values, then run mount -a to test. — Using UUID in fstab ensures persistent mounting; testing with mount -a verifies no errors.
What should I do if I get this LFCS question wrong?
Identify which LFCS 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.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
This LFCS practice question is part of Courseiva's free Linux Foundation 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 LFCS exam.
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