LFCS Storage Management Practice Question
Which two commands can be used to create an ext4 filesystem on a Linux block device? (Choose two.)
⚠ Common exam trap
It's easy for candidates to confuse `mke2fs -j` (which creates ext3) with a command that creates ext4, or think `tune2fs` can create a filesystem, when it only modifies existing ones.
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
✓
mke2fs -t ext4 /dev/sdb1
Both `mke2fs -t ext4` and `mkfs.ext4` are valid commands to create an ext4 filesystem. `mke2fs` is the underlying tool for creating ext2/ext3/ext4 filesystems, and the `-t ext4` flag explicitly sets the filesystem type to ext4. `mkfs.ext4` is a wrapper script that calls `mke2fs` with the appropriate options for ext4, making it a direct and commonly used alternative.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
fsck.ext4 /dev/sdb1
Why it's wrong here
Checks a filesystem, does not create.
- ✗
mke2fs -j /dev/sdb1
Why it's wrong here
Creates ext3, not ext4.
- ✓
mke2fs -t ext4 /dev/sdb1
Why this is correct
Creates ext4 using the -t ext4 option.
- ✗
tune2fs -O extents /dev/sdb1
Why it's wrong here
Modifies an existing filesystem, does not create one.
- ✓
mkfs.ext4 /dev/sdb1
Why this is correct
Creates an ext4 filesystem directly.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.