mediumMultiple ChoiceObjective-mapped
XK0-006 Practice Question: An administrator adds a new disk /dev/sdc1 and…
Exhibit
Refer to the exhibit. ``` $ cat /etc/fstab UUID=abc123 / ext4 defaults 1 1 UUID=def456 /boot ext4 defaults 1 2 UUID=ghi789 none swap sw 0 0 /dev/sdb1 /data ext4 defaults 0 0 ```
An administrator adds a new disk /dev/sdc1 and wants it mounted at /mnt/backup at every boot. Based on the exhibit, which line should be added to /etc/fstab?
⚠ Common exam trap
CompTIA Linux+ often tests the requirement to use UUIDs in /etc/fstab for persistent mounts, and the trap here is that candidates may incorrectly choose a device path option (like /dev/sdc1) or a wrong mount point, overlooking the need for exact directory matching and proper fsck values.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
UUID=xyz789 /mnt/backup ext4 defaults 0 0
/etc/fstab entries should use UUIDs for persistent device identification, and the mount point must exactly match the intended directory /mnt/backup. The 'defaults' option and '0 0' (no dump, no fsck) are appropriate for a non-root filesystem that does not require boot-time checking.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
UUID=xyz789 /backup ext4 defaults 0 0
Why it's wrong here
Wrong mount point.
- ✗
UUID=xyz789 /mnt/backup ext4 nofail 0 0
Why it's wrong here
nofail is not necessary; defaults is fine.
- ✗
/dev/sdc1 /mnt/backup ext4 defaults 0 2
Why it's wrong here
Uses device name and wrong pass value (should be 0 for non-root).
- ✗
/dev/sdc1 /mnt/backup ext4 defaults 0 0
Why it's wrong here
Uses device name, not UUID, which is not consistent with the existing entries.
- ✓
UUID=xyz789 /mnt/backup ext4 defaults 0 0
Why this is correct
Correct format with UUID.
Go deeper
Related to this question
Learn chapter
Navigating the Filesystem
Key term
Mount
Mounting is the process of making a file system or storage device accessible to a computer's operating system by attaching it to a specific directory in the existing directory tree.
Key term
fsck
fsck is a command-line tool that checks and repairs inconsistencies in a file system, ensuring data integrity.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This XK0-006 practice question is part of Courseiva's free CompTIA certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the XK0-006 exam.