LPIC-1 Devices, Filesystems and FHS Practice Question
Exhibit
$ sudo fdisk -l /dev/sdb Disk /dev/sdb: 10 GiB, 10737418240 bytes, 20971520 sectors Units: sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disklabel type: gpt Device Start End Sectors Size Type /dev/sdb1 2048 20971519 20969472 10G Linux filesystem $ sudo blkid /dev/sdb1 /dev/sdb1: UUID="12345678-1234-1234-1234-123456789abc" TYPE="ext4" PARTUUID="abcdef01-02"
Refer to the exhibit. The administrator wants to mount /dev/sdb1 persistently using its UUID. Which line should be added to /etc/fstab?
⚠ Common exam trap
Candidates often confuse the filesystem UUID with the partition UUID (e.g., from GPT partition table). Only the filesystem UUID as shown by blkid works in /etc/fstab.
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=12345678-1234-1234-1234-123456789abc /mnt/data ext4 defaults 0 2
The /etc/fstab entry must use the full UUID of the filesystem (not the partition) in the format UUID=... followed by the mount point, filesystem type, mount options, dump flag, and fsck order. The UUID uniquely identifies the filesystem regardless of device name changes, making mounts persistent across reboots.
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=abcdef01-02 /mnt/data ext4 defaults 0 2
Why it's wrong here
abcdef01-02 is the PARTUUID, not the filesystem UUID.
- ✗
/dev/sdb1 /mnt/data ext4 defaults 0 2
Why it's wrong here
Using device name is not persistent; device names can change.
- ✗
LABEL= /mnt/data ext4 defaults 0 2
Why it's wrong here
There is no label shown; LABEL= requires a label.
- ✓
UUID=12345678-1234-1234-1234-123456789abc /mnt/data ext4 defaults 0 2
Why this is correct
This line uses the correct UUID, mount point, filesystem type, and options.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This LPIC-1 practice question is part of Courseiva's free LPI 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 LPIC-1 exam.