LFCS Storage Management Practice Question
A junior administrator needs to mount an ISO image located at /opt/images/install.iso to the directory /mnt/iso without burning it to a physical disc. Which command should be used?
⚠ Common exam trap
The trap here is thinking that specifying the iso9660 filesystem type is sufficient to mount an ISO file, when the loop option is the critical piece that associates the file with a loop device.
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
✓
mount -o loop /opt/images/install.iso /mnt/iso
Mounting an ISO file requires the loop option so the kernel can treat the file as a block device and read its ISO9660 filesystem. The mount -o loop command is the simplest and most common way to achieve this. Alternatives like specifying only the filesystem type or using a bind mount do not correctly expose the ISO's contents.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
losetup /dev/loop0 /opt/images/install.iso && mount /dev/loop0 /mnt/iso
Why it's wrong here
This two-step approach manually associates the ISO with /dev/loop0 and then mounts it. While it can work, it is more complex and requires managing the loop device manually. The single mount -o loop command is simpler and preferred for ad-hoc ISO mounting. It also automatically picks an available loop device.
- ✗
mount --bind /opt/images/install.iso /mnt/iso
Why it's wrong here
The --bind option creates a bind mount, which makes the same file or directory visible at another location. It does not interpret the ISO file as a filesystem; it simply mirrors the file itself. This would make /mnt/iso/install.iso accessible, not the contents of the ISO image.
- ✓
mount -o loop /opt/images/install.iso /mnt/iso
Why this is correct
The loop option tells mount to associate the ISO file with a loop device, making it accessible as a block device, and then mount it at the specified directory. This is the standard method for accessing ISO images without physical media. The directory /mnt/iso must already exist before running the command.
- ✗
mount -t iso9660 /opt/images/install.iso /mnt/iso
Why it's wrong here
Specifying -t iso9660 sets the filesystem type, but without the loop option mount will try to treat the ISO file as a block device, which fails because it is a regular file. The loop option is required to create the loop device association. The filesystem type alone does not enable mounting a file.
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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.