This EX200 practice question tests your understanding of create and configure file systems. 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.
Which command displays the UUID of all file systems on the system?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
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.
blkid
blkid shows UUID, file system type, and other attributes for all block devices.
dumpe2fs -h
Why wrong: dumpe2fs shows file system parameters but only for ext2/ext3/ext4, and only for one device at a time.
lsblk
Why wrong: lsblk without -f does not show UUID.
fdisk -l
Why wrong: fdisk -l shows partition information but not file system UUIDs.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
blkid
The `blkid` command is the correct choice because it is specifically designed to locate and display block device attributes, including the UUID, filesystem type, and label, for all filesystems on the system. It reads data from the `/dev/disk/by-uuid/` directory and the `udev` database, making it the most direct and reliable tool for querying UUIDs without requiring root privileges for basic output.
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.
blkid
Why this is correct
blkid shows UUID, file system type, and other attributes for all block devices.
Clue confirmation
The clue word "which command" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
dumpe2fs -h
Why it's wrong here
dumpe2fs shows file system parameters but only for ext2/ext3/ext4, and only for one device at a time.
lsblk
Why it's wrong here
lsblk without -f does not show UUID.
fdisk -l
Why it's wrong here
fdisk -l shows partition information but not file system UUIDs.
Common exam traps
Red Hat often tests the distinction between partition-level identifiers (shown by `fdisk -l` for GPT partition UUIDs) and filesystem-level UUIDs (shown by `blkid`), leading candidates to mistakenly choose `fdisk -l` when the question specifically asks for filesystem UUIDs.
Trap categories for this question
Command / output trap
dumpe2fs shows file system parameters but only for ext2/ext3/ext4, and only for one device at a time.
Detailed technical explanation
Under the hood, `blkid` uses the `libblkid` library to probe block devices for filesystem signatures (e.g., ext4 superblock, XFS magic number) and extracts metadata like UUIDs stored in the superblock or label area. A subtle behavior is that `blkid` can sometimes show stale UUIDs if the `udev` cache is not updated after a filesystem change; running `blkid -p` forces a fresh probe of the device. In real-world scenarios, UUIDs are critical for persistent mounting in `/etc/fstab` because they remain constant even if device names (e.g., `/dev/sda1`) change due to hardware reordering.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A junior network technician can log in to a core router but cannot reach the enable prompt or configuration mode. The AAA server is authenticating the login — but the authorisation policy only grants privilege level 1, not 15. Authentication (who you are) is working; authorisation (what you can do) is not.
What to study next
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Create and configure file systems — study guide chapter
Learn the concepts, then practise the questions
Create and configure file systems practice questions
Targeted practice on this topic area only
All EX200 questions
527 questions across all exam domains
Red Hat Certified System Administrator EX200 study guide
Full concept coverage aligned to exam objectives
EX200 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 EX200 questions linked to Operate running systems.
Practise EX200 questions linked to Configure local storage.
Practise EX200 questions linked to Create and configure file systems.
Practise EX200 questions linked to Deploy, configure, and maintain systems.
Practise EX200 questions linked to Manage users and groups.
Practise EX200 questions linked to Manage security.
Practise EX200 questions linked to Manage containers.
Practise EX200 questions linked to Create simple shell scripts.
Practise EX200 questions linked to Essential Tools.
Practise EX200 questions linked to EX200 fundamentals.
Practise EX200 questions linked to EX200 scenario.
Practise EX200 questions linked to EX200 troubleshooting.
Practice this exam
Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.
FAQ
Create and configure file systems — This question tests Create and configure file systems — Read the scenario before looking for a memorised answer..
The correct answer is: blkid — The `blkid` command is the correct choice because it is specifically designed to locate and display block device attributes, including the UUID, filesystem type, and label, for all filesystems on the system. It reads data from the `/dev/disk/by-uuid/` directory and the `udev` database, making it the most direct and reliable tool for querying UUIDs without requiring root privileges for basic output.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Yes — watch for: "which command". Tests specific CLI syntax. Recall the exact command and its required context — near-synonyms and partial matches are common distractors.
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 30, 2026
This EX200 practice question is part of Courseiva's free Red Hat 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 EX200 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.