This LFCS practice question tests your understanding of storage management. 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. NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT sda 8:0 0 40G 0 disk ├─sda1 8:1 0 500M 0 part /boot └─sda2 8:2 0 39.5G 0 part / sdb 8:16 0 20G 0 disk └─sdb1 8:17 0 20G 0 part /home
Refer to the exhibit. Which device is the root filesystem mounted from?
Refer to the exhibit. NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT sda 8:0 0 40G 0 disk ├─sda1 8:1 0 500M 0 part /boot └─sda2 8:2 0 39.5G 0 part / sdb 8:16 0 20G 0 disk └─sdb1 8:17 0 20G 0 part /home
/dev/sda2
Mounted on /.
/dev/sdb
Why wrong: Not a filesystem, the whole disk.
/dev/sdb1
Why wrong: Mounted on /home.
/dev/sda1
Why wrong: Mounted on /boot.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
/dev/sda2
The root filesystem is mounted from /dev/sda2 because the output of the `mount` command shows that the device `/dev/sda2` is mounted on `/` (the root directory). This is the standard location for the root filesystem in Linux, and the mount point `/` uniquely identifies it.
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.
/dev/sda2
Why this is correct
Mounted on /.
Related concept
Read the scenario before looking for a memorised answer.
/dev/sdb
Why it's wrong here
Not a filesystem, the whole disk.
/dev/sdb1
Why it's wrong here
Mounted on /home.
/dev/sda1
Why it's wrong here
Mounted on /boot.
Common exam traps
The trap here is that candidates often confuse the root filesystem with the boot partition (e.g., /dev/sda1) or assume the first partition (sda1) is always the root, but the mount output clearly shows /dev/sda2 mounted on `/`.
Detailed technical explanation
The root filesystem is the top of the Linux filesystem hierarchy, mounted at `/` during boot by the initramfs or kernel. The `mount` command reads `/proc/mounts` to display active mounts, and the device listed with mount point `/` is the root device. In practice, misidentifying the root device can lead to boot failures if the wrong partition is targeted for repairs or resizing.
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 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
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Storage Management — study guide chapter
Learn the concepts, then practise the questions
Storage Management practice questions
Targeted practice on this topic area only
All LFCS questions
513 questions across all exam domains
Linux Foundation Certified System Administrator LFCS study guide
Full concept coverage aligned to exam objectives
LFCS practice test guide
How to use practice tests most effectively before exam day
Related practice questions
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
Practise LFCS questions linked to User and Group Management.
Practise LFCS questions linked to Operation of Running Systems.
Practise LFCS questions linked to Essential Commands.
Practise LFCS questions linked to Networking.
Practise LFCS questions linked to Service Configuration.
Practise LFCS questions linked to Storage Management.
Practise LFCS questions linked to LFCS fundamentals.
Practise LFCS questions linked to LFCS scenario.
Practise LFCS questions linked to LFCS troubleshooting.
Practice this exam
Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.
FAQ
Storage Management — This question tests Storage Management — Read the scenario before looking for a memorised answer..
The correct answer is: /dev/sda2 — The root filesystem is mounted from /dev/sda2 because the output of the `mount` command shows that the device `/dev/sda2` is mounted on `/` (the root directory). This is the standard location for the root filesystem in Linux, and the mount point `/` uniquely identifies it.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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 →
Keep practising
Last reviewed: Jul 4, 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.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.