LPIC-1 Devices, Filesystems and FHS Practice Question
Which THREE of the following commands can be used to display information about block devices?
⚠ Common exam trap
Watch out — candidates often confuse `free` (memory) or `ip link` (network) with block device commands, or forget that `fdisk -l` and `blkid` also display block device information, not just `lsblk`.
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
✓
lsblk
A is correct because `lsblk` lists all block devices (e.g., hard drives, SSDs, partitions) by reading the sysfs filesystem and the udev database, displaying their names, sizes, and mount points. It is the primary command for viewing block device topology.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
lsblk
Why this is correct
Lists block devices.
- ✗
free
Why it's wrong here
Shows memory usage.
- ✓
fdisk -l
Why this is correct
Lists partition tables of block devices.
- ✓
blkid
Why this is correct
Displays block device attributes.
- ✗
ip link
Why it's wrong here
Shows network interfaces.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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