LFCS Essential Commands Practice Question
A storage administrator needs to identify which filesystem is mounted at /mnt/data and display the mount options currently in effect for it, using a single command that reads the kernel mount table. Which command should be used?
⚠ Common exam trap
The trap here is reaching for df to inspect a mount, when df reports space usage rather than the mount options recorded in the kernel table.
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
✓
findmnt /mnt/data
The kernel mount table contains the authoritative record of what is mounted and with which options. findmnt queries that table and filters by mount point, displaying the source, target, filesystem type, and options. df and lsblk report capacity or topology, and blkid identifies filesystem signatures, but none of them show the active mount options for a given mount point.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
blkid /mnt/data
Why it's wrong here
This fails because blkid probes block devices for filesystem UUIDs, labels, and types, and a mount point path is not a block device. It would return nothing useful. blkid cannot report the options under which a filesystem was mounted, so it does not satisfy the scenario.
- ✓
findmnt /mnt/data
Why this is correct
This is correct because findmnt reads /proc/self/mountinfo and prints the matching mount entry, including the source device, filesystem type, and the full option list in the OPTIONS column. It directly answers which filesystem is mounted and what options are active for that specific mount point.
- ✗
lsblk /mnt/data
Why it's wrong here
This is invalid because lsblk expects a block device name such as /dev/sda1, not a mount point path. It would report no matching device. Even with a valid device, lsblk shows topology and mount points but not the active mount options for a filesystem.
- ✗
df -h /mnt/data
Why it's wrong here
This reports the filesystem device and space usage for the mount point but does not show the mount options in effect. It reads from statfs and /proc/mounts indirectly but presents only size, used, available, and use percentage. The requirement to display current mount options is not met.
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official Linux Foundation exam blueprint
This LFCS practice question is part of Courseiva's free Linux Foundation 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 LFCS exam.