Quick Answer
The correct answer is `mount -t ext4 /dev/sdb1 /mnt/data` and `mount /dev/sdb1 /mnt/data`, as both follow the standard mount command syntax of `mount [options] <device> <mountpoint>`. This syntax requires the device path first, then the target directory, because the kernel needs to know which block device to attach before knowing where to attach it in the filesystem tree. On the Linux Foundation Certified System Administrator LFCS exam, this tests your understanding of the fundamental mount command structure, often appearing in performance-based tasks where you must mount a filesystem without error. A common trap is reversing the order—placing the mountpoint before the device—which will fail because the command expects the device argument first. Remember the mnemonic "Device before Destination" to keep the order straight: you always specify what you are mounting before where you are mounting it.
This LFCS practice question tests your understanding of storage management. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Which TWO commands can be used to mount a filesystem on /dev/sdb1 to /mnt/data?
mount /mnt/data /dev/sdb1
Why wrong: Arguments reversed: device then mount point.
mount /dev/sdb1 /mnt/data
Standard mount command; works if filesystem is recognized.
mount -t ext4 /dev/sdb1 /mnt/data
Specifies filesystem type and works.
mount -o loop /dev/sdb1 /mnt/data
Why wrong: -o loop is for loop devices (files), not block devices.
mount -t auto /dev/sdb1 /mnt/data -o loop
Why wrong: Loop option not needed for block devices.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
mount /dev/sdb1 /mnt/data
Option B is correct because the standard syntax for the mount command is `mount [options] <device> <mountpoint>`, so `mount /dev/sdb1 /mnt/data` correctly specifies the device first and the target directory second. Option C is also correct because it explicitly specifies the filesystem type with `-t ext4`, which is a valid and common practice when mounting a filesystem, ensuring the kernel uses the correct driver.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
mount /mnt/data /dev/sdb1
Why it's wrong here
Arguments reversed: device then mount point.
mount /dev/sdb1 /mnt/data
Why this is correct
Standard mount command; works if filesystem is recognized.
Related concept
Read the scenario before looking for a memorised answer.
mount -t ext4 /dev/sdb1 /mnt/data
Why this is correct
Specifies filesystem type and works.
Related concept
Read the scenario before looking for a memorised answer.
mount -o loop /dev/sdb1 /mnt/data
Why it's wrong here
-o loop is for loop devices (files), not block devices.
mount -t auto /dev/sdb1 /mnt/data -o loop
Why it's wrong here
Loop option not needed for block devices.
Common exam traps
Linux Foundation often tests the argument order of the mount command, trapping candidates who confuse the device and mount point positions, especially when combined with options like `-t` or `-o`.
Detailed technical explanation
The mount command interacts with the kernel's VFS layer, which uses the `mount()` system call to attach a filesystem from a block device to a directory inode. When `-t ext4` is specified, the kernel loads the ext4 module and reads the superblock from `/dev/sdb1` to validate the filesystem; omitting `-t` triggers autodetection via `blkid` or probing, which can fail if the filesystem is corrupted or unrecognized. In real-world scenarios, explicitly specifying the type is safer for scripting, as it avoids reliance on probing and ensures predictable behavior.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A practitioner preparing for the LFCS exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
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FAQ
Storage Management — This question tests Storage Management — Read the scenario before looking for a memorised answer..
The correct answer is: mount /dev/sdb1 /mnt/data — Option B is correct because the standard syntax for the mount command is `mount [options] <device> <mountpoint>`, so `mount /dev/sdb1 /mnt/data` correctly specifies the device first and the target directory second. Option C is also correct because it explicitly specifies the filesystem type with `-t ext4`, which is a valid and common practice when mounting a filesystem, ensuring the kernel uses the correct driver.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 30, 2026
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.
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