This LFCS practice question tests your understanding of storage 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.
Refer to the exhibit. UUID=12345678-1234-1234-1234-123456789abc / ext4 defaults,noatime 0 1 UUID=abcdef12-3456-7890-abcd-ef1234567890 /home ext4 defaults 0 2 UUID=deadbeef-0123-4567-89ab-cdef01234567 swap swap defaults 0 0 /dev/sr0 /mnt/cdrom auto noauto,user 0 0
Refer to the exhibit. Which mount options are set for the root filesystem?
Refer to the exhibit. UUID=12345678-1234-1234-1234-123456789abc / ext4 defaults,noatime 0 1 UUID=abcdef12-3456-7890-abcd-ef1234567890 /home ext4 defaults 0 2 UUID=deadbeef-0123-4567-89ab-cdef01234567 swap swap defaults 0 0 /dev/sr0 /mnt/cdrom auto noauto,user 0 0
defaults,noatime
The root filesystem has defaults and noatime options.
defaults
Why wrong: That is for /home.
errors=remount-ro
Why wrong: Not present in this fstab.
noauto,user
Why wrong: That is for the CD-ROM.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
defaults,noatime
The root filesystem is mounted with both 'defaults' and 'noatime' options. 'defaults' includes standard options like rw, suid, dev, exec, auto, nouser, and async. 'noatime' disables updating the access time (atime) on every read, reducing disk I/O and improving performance, especially on SSDs or virtualized systems.
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.
defaults,noatime
Why this is correct
The root filesystem has defaults and noatime options.
Related concept
Read the scenario before looking for a memorised answer.
defaults
Why it's wrong here
That is for /home.
errors=remount-ro
Why it's wrong here
Not present in this fstab.
noauto,user
Why it's wrong here
That is for the CD-ROM.
Common exam traps
The trap here is that candidates often assume 'defaults' includes all common options like 'noatime' or 'errors=remount-ro', but 'defaults' is a fixed set of options (rw, suid, dev, exec, auto, nouser, async) and does not include performance or error-handling options unless explicitly specified.
Detailed technical explanation
The 'noatime' option is commonly used in high-performance or low-wear environments (e.g., databases, web servers, or embedded systems) to avoid the overhead of writing access timestamps on every file read. Under the hood, the kernel skips updating the inode's atime field, which can significantly reduce disk writes. However, some applications (e.g., mail servers or backup tools) rely on atime to determine file access patterns, so 'relatime' (update atime only if older than mtime/ctime) is often a safer compromise.
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 LFCS 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
Storage Management — This question tests Storage Management — Read the scenario before looking for a memorised answer..
The correct answer is: defaults,noatime — The root filesystem is mounted with both 'defaults' and 'noatime' options. 'defaults' includes standard options like rw, suid, dev, exec, auto, nouser, and async. 'noatime' disables updating the access time (atime) on every read, reducing disk I/O and improving performance, especially on SSDs or virtualized systems.
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: Jul 4, 2026
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