The correct fstab entry is `/dev/sdb1 /mnt/data ext4 defaults,noatime 0 2` because the `defaults` option already includes `auto` for automatic mounting at boot, and adding `noatime` disables access time updates to reduce disk writes. For ext4 filesystems, there is no `uid` mount option—ownership is determined by the files themselves, not the mount line, so preserving user ownership requires setting permissions on the data directly. On the CompTIA Linux+ XK0-005 exam, this question tests your understanding that `defaults` is a shorthand for standard options like `rw,suid,dev,exec,auto,nouser,async,relatime`, and that `noatime` simply overrides `relatime`. A common trap is choosing an entry with `uid` or `user`—the former is invalid for ext4, and the latter allows any user to mount, which is a security risk. The `0 2` at the end specifies no dump and a non-root fsck order. Memory tip: think "defaults,noatime" for data drives—it's the safe, standard choice.
XK0-005 System Management Practice Question
This XK0-005 practice question tests your understanding of system 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.
A Linux administrator needs to mount a new ext4 filesystem on /dev/sdb1 to /mnt/data. The administrator wants the filesystem to be mounted automatically at boot with noatime and with user ownership of files to be preserved (i.e., the filesystem should be owned by a specific user). Which line should be added to /etc/fstab?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
/dev/sdb1 /mnt/data ext4 defaults,noatime 0 2
For ext4, the uid mount option does not exist; ownership is based on the files themselves. The default mount options are specified by 'defaults', which includes rw, suid, dev, exec, auto, nouser, async, and relatime. Adding 'noatime' replaces relatime. A typical /etc/fstab entry for a data filesystem uses 'defaults,noatime' and pass number 2 for non-root filesystems. Option B uses uid which is invalid for ext4. Option C uses rw but pass 0 prevents fsck. Option D uses user which allows non-root users to mount.
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.
✓
/dev/sdb1 /mnt/data ext4 defaults,noatime 0 2
Why this is correct
Correct line for ext4 with noatime and pass 2 for fsck.
Related concept
Read the scenario before looking for a memorised answer.
✗
LABEL=DATA /mnt/data ext4 noatime,user 0 2
Why it's wrong here
The 'user' option allows any user to mount, which is not a standard practice and does not preserve ownership.
uid option is not supported for ext4; it is for FAT filesystems.
✗
/dev/sdb1 /mnt/data ext4 rw,noatime 0 0
Why it's wrong here
Pass 0 means no fsck; normally non-root filesystems have pass 2.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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 XK0-005 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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this XK0-005 question in full detail.
Identify which XK0-005 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
System Management — This question tests System Management — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: /dev/sdb1 /mnt/data ext4 defaults,noatime 0 2 — For ext4, the uid mount option does not exist; ownership is based on the files themselves. The default mount options are specified by 'defaults', which includes rw, suid, dev, exec, auto, nouser, async, and relatime. Adding 'noatime' replaces relatime. A typical /etc/fstab entry for a data filesystem uses 'defaults,noatime' and pass number 2 for non-root filesystems. Option B uses uid which is invalid for ext4. Option C uses rw but pass 0 prevents fsck. Option D uses user which allows non-root users to mount.
What should I do if I get this XK0-005 question wrong?
Identify which XK0-005 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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