Quick Answer
The correct answer is that the system will fail to boot entirely. This happens because when /etc/fstab contains an incorrect UUID for the /home partition, the boot process attempts to mount that filesystem using the specified identifier; since the UUID does not match any available block device, the mount operation fails. Because /home is a required filesystem and is not listed with the 'nofail' option, systemd treats the mount failure as a critical error, causing the boot to halt and drop into an emergency shell rather than allowing partial functionality. On the CompTIA Linux+ XK0-005 exam, this scenario tests your understanding of how the systemd boot process handles fstab entries—a common trap is assuming the system will simply skip the bad entry or mount /home elsewhere. Remember the memory tip: "No UUID match? No boot—unless nofail is attached."
This XK0-005 practice question tests your understanding of troubleshooting. 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.
A user reports that their home directory is missing after a system reboot. The /home partition is listed in /etc/fstab with an incorrect UUID. What is the most likely outcome?
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.
The system will boot normally and mount /home using the device name
Why wrong: Mount uses UUID; if incorrect, fails.
The system will prompt the user to enter the correct UUID
Why wrong: No interactive prompt on boot.
The system will boot but fail to mount /home
Why wrong: Correct outcome but boot continues.
The system will fail to boot entirely
Incorrect root UUID would cause boot failure; for /home, boot continues.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
The system will fail to boot entirely
When /etc/fstab contains an incorrect UUID for the /home partition, the systemd-based boot process (or traditional init) will attempt to mount the partition using that UUID. If the UUID does not match any block device, the mount fails. Because /home is not listed with the 'nofail' option in fstab, the boot process treats this as a critical failure and drops into an emergency shell or fails to complete boot, preventing normal login. Option D is correct because an incorrect UUID for a required filesystem causes a boot failure, not a partial mount or a prompt.
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.
The system will boot normally and mount /home using the device name
Why it's wrong here
Mount uses UUID; if incorrect, fails.
The system will prompt the user to enter the correct UUID
Why it's wrong here
No interactive prompt on boot.
The system will boot but fail to mount /home
Why it's wrong here
Correct outcome but boot continues.
The system will fail to boot entirely
Why this is correct
Incorrect root UUID would cause boot failure; for /home, boot continues.
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.
Common exam traps
CompTIA often tests the misconception that a missing or incorrect UUID only affects the specific mount point, leading candidates to choose 'boot but fail to mount /home' (Option C), when in fact the default behavior is to halt the boot process entirely for required filesystems.
Detailed technical explanation
Under the hood, systemd uses systemd-fstab-generator to parse /etc/fstab and create mount units. If a mount unit fails due to an incorrect UUID, systemd marks the corresponding 'local-fs.target' as failed, which can prevent the system from reaching the default runlevel. The 'nofail' option in fstab (or x-systemd.automount) would allow boot to continue even if the mount fails, but by default, missing required filesystems are fatal. In real-world scenarios, this often occurs after cloning disks or restoring from backup without updating UUIDs in fstab.
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 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.
What to study next
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Troubleshooting — study guide chapter
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FAQ
Troubleshooting — This question tests Troubleshooting — Read the scenario before looking for a memorised answer..
The correct answer is: The system will fail to boot entirely — When /etc/fstab contains an incorrect UUID for the /home partition, the systemd-based boot process (or traditional init) will attempt to mount the partition using that UUID. If the UUID does not match any block device, the mount fails. Because /home is not listed with the 'nofail' option in fstab, the boot process treats this as a critical failure and drops into an emergency shell or fails to complete boot, preventing normal login. Option D is correct because an incorrect UUID for a required filesystem causes a boot failure, not a partial mount or a prompt.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 30, 2026
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