LFCS Storage Management Practice Question
A junior administrator needs to mount an ISO image located at /opt/install.iso to the /mnt/iso directory to access its contents. Which command accomplishes this?
⚠ Common exam trap
The trap here is forgetting the loop option and specifying only the filesystem type, which fails because mount expects a block device, not a regular file.
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/install.iso /mnt/iso
Mounting an ISO file requires the loop option so that the kernel treats the file as a block device. The command mount -o loop /opt/install.iso /mnt/iso creates a loop device automatically and mounts the ISO9660 filesystem, making the contents accessible. This is the standard method for accessing ISO images without burning them.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
mount --bind /opt/install.iso /mnt/iso
Why it's wrong here
The --bind option performs a bind mount, which makes a directory or file visible at another location in the filesystem tree. It does not interpret the ISO format or create a loop device. Using --bind on a regular file would simply make that file appear at /mnt/iso, not the contents of the ISO image.
- ✗
losetup /dev/loop0 /opt/install.iso && mount /dev/loop0 /mnt/iso
Why it's wrong here
While this sequence can work, it is more manual and error-prone. losetup associates the file with a loop device, then mount uses that device. However, the question asks for the command to mount the ISO, and the single mount command with -o loop is the direct and expected method. This option is technically valid but not the simplest correct answer.
- ✗
mount -t iso9660 /opt/install.iso /mnt/iso
Why it's wrong here
Specifying the filesystem type as iso9660 is correct for the content, but without the loop option, mount will try to treat /opt/install.iso as a block device. Since it is a regular file, the mount will fail with an error about not being a block device. The loop option is essential to create the necessary loop device.
- ✓
mount -o loop /opt/install.iso /mnt/iso
Why this is correct
The -o loop option tells mount to associate the ISO file with a loop device, making it accessible as a block device. This allows the filesystem inside the ISO (usually ISO9660) to be mounted at the specified directory. It is the standard and correct way to mount an ISO image on Linux without burning it to physical media.
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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.