EX200 Create and configure file systems Practice Question
This EX200 practice question tests your understanding of create and configure file systems. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.
```
$ cat /etc/fstab
/dev/mapper/rhel-root / xfs defaults 0 0
UUID=1234-5678 /boot xfs defaults 0 0
/dev/sdb1 /mydata ext4 defaults 0 0
```
The /mydata directory does not exist on the system.
After adding the last line to /etc/fstab, the system fails to boot with an error. What is the most likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The mount point /mydata does not exist
When a mount point directory specified in /etc/fstab does not exist, the systemd mount unit will fail during boot because the mount operation cannot find the target directory. This is a common misconfiguration: the fstab entry references /mydata, but the directory has not been created with mkdir. The boot process halts with an error indicating the mount point is missing, not that the device or filesystem is invalid.
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.
✗
The UUID for /boot is invalid
Why it's wrong here
The UUID for /boot is given as a placeholder, but there is no indication it is invalid.
✓
The mount point /mydata does not exist
Why this is correct
The exhibit shows the mount point /mydata, and it is explicitly stated that this directory does not exist. Systemd will fail to mount.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The device /dev/sdb1 is not formatted
Why it's wrong here
While possible, a missing mount point is a more common cause of boot failure from fstab.
✗
The filesystem type ext4 is incorrect for /dev/sdb1
Why it's wrong here
There is no information given about the actual filesystem on /dev/sdb1; this is speculative.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often focus on device or filesystem issues (UUID, formatting, type) and overlook the simple prerequisite that the mount point directory must exist, which is a fundamental step tested in the EX200.
Detailed technical explanation
How to think about this question
Under the hood, systemd parses /etc/fstab and generates mount units dynamically. If the mount point directory is absent, the mount unit fails with 'No such file or directory' (ENOENT) before any device interaction occurs. This is a common pitfall when adding new entries: the directory must exist before the mount is attempted, even if the device and filesystem are perfectly valid.
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: The mount point /mydata does not exist — When a mount point directory specified in /etc/fstab does not exist, the systemd mount unit will fail during boot because the mount operation cannot find the target directory. This is a common misconfiguration: the fstab entry references /mydata, but the directory has not been created with mkdir. The boot process halts with an error indicating the mount point is missing, not that the device or filesystem is invalid.
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: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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