EX200 Create and configure file systems Practice Question
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.
Exhibit
Refer to the exhibit.
$ mount | grep /mnt/data
/dev/sdb1 on /mnt/data type xfs (rw,relatime,seclabel,attr2,inode64,noquota)
The administrator wants to remount /mnt/data with the noexec option. Which command is correct?
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.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
mount -o remount,noexec /mnt/data
Option D is correct because the `mount -o remount,noexec /mnt/data` command changes the mount options of an already mounted filesystem without needing to unmount it first. The `remount` option applies the new `noexec` flag to the existing mount point, preventing execution of binaries on that filesystem. This is the standard and safest way to modify mount options on a live system.
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.
✗
Edit /etc/fstab to add noexec and reboot
Why it's wrong here
Incorrect: Rebooting is unnecessary; a remount is immediate.
✗
mount -o remount,noexec /dev/sdb1 /mnt/data
Why it's wrong here
Incorrect: The device argument is not needed; mount point is sufficient.
✗
umount /mnt/data && mount -o noexec /dev/sdb1 /mnt/data
Why it's wrong here
Incorrect: Unmounting is not required; remounting is more efficient.
✓
mount -o remount,noexec /mnt/data
Why this is correct
Correct: remounts with additional option noexec.
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.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Red Hat often tests the distinction between `remount` (which modifies options on a live mount) and the incorrect habit of specifying the device name with `remount`, leading candidates to choose Option B because they think the device must be included.
Detailed technical explanation
How to think about this question
The `mount -o remount` operation uses the `MS_REMOUNT` flag in the `mount()` system call, which modifies the mount options without changing the underlying mount structure. This is particularly useful for adding `noexec` to a filesystem like `/tmp` to prevent execution of scripts in a security-sensitive environment, while keeping all existing file handles and processes intact. The `noexec` option does not affect directories or files that are already mapped into memory, but it prevents new `execve()` calls on the filesystem.
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.
TExam Day Tips
→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 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
Got this wrong? Here's your next step.
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 — This question tests Create and configure file systems — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: mount -o remount,noexec /mnt/data — Option D is correct because the `mount -o remount,noexec /mnt/data` command changes the mount options of an already mounted filesystem without needing to unmount it first. The `remount` option applies the new `noexec` flag to the existing mount point, preventing execution of binaries on that filesystem. This is the standard and safest way to modify mount options on a live system.
What should I do if I get this EX200 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
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.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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