This EX200 practice question tests your understanding of configure local 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.
Which of the following is the correct way to persistently mount a filesystem using its UUID?
LABEL=1234 /mnt xfs defaults 0 0
Why wrong: LABEL is for volume labels, not UUID.
UUID=1234 /mnt xfs defaults 0 0
Valid fstab entry using UUID.
/dev/disk/by-uuid/1234 /mnt xfs defaults 0 0
Why wrong: This is a symlink path, not the UUID syntax.
PARTUUID=1234 /mnt xfs defaults 0 0
Why wrong: PARTUUID is for partition table UUIDs, not filesystem 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
UUID=1234 /mnt xfs defaults 0 0
Option B is correct because the /etc/fstab entry uses the 'UUID=' prefix followed by the actual UUID value to persistently mount a filesystem. The kernel reads this line at boot time and resolves the UUID to the corresponding block device, ensuring the mount is consistent regardless of device name changes.
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.
LABEL=1234 /mnt xfs defaults 0 0
Why it's wrong here
LABEL is for volume labels, not UUID.
UUID=1234 /mnt xfs defaults 0 0
Why this is correct
Valid fstab entry using UUID.
Related concept
Read the scenario before looking for a memorised answer.
/dev/disk/by-uuid/1234 /mnt xfs defaults 0 0
Why it's wrong here
This is a symlink path, not the UUID syntax.
PARTUUID=1234 /mnt xfs defaults 0 0
Why it's wrong here
PARTUUID is for partition table UUIDs, not filesystem UUIDs.
Common exam traps
The trap here is that candidates confuse the 'UUID=' fstab syntax with the /dev/disk/by-uuid/ path, or mistakenly think 'LABEL=' or 'PARTUUID=' are interchangeable with UUID for filesystem identification.
Detailed technical explanation
The UUID is a 128-bit value stored in the filesystem superblock (e.g., for XFS, it is written during mkfs.xfs). The kernel uses the udev device manager to create symlinks under /dev/disk/by-uuid/ mapping each UUID to its device node, but fstab must use the 'UUID=' syntax to trigger the kernel's built-in UUID resolution. A common real-world scenario is when disk order changes after a reboot (e.g., /dev/sdb becomes /dev/sdc), and using UUID prevents mount failures.
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 EX200 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
Configure local storage — This question tests Configure local storage — Read the scenario before looking for a memorised answer..
The correct answer is: UUID=1234 /mnt xfs defaults 0 0 — Option B is correct because the /etc/fstab entry uses the 'UUID=' prefix followed by the actual UUID value to persistently mount a filesystem. The kernel reads this line at boot time and resolves the UUID to the corresponding block device, ensuring the mount is consistent regardless of device name changes.
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.
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Last reviewed: Jun 24, 2026
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