LPIC-1 Devices, Filesystems and FHS Practice Question
Which TWO of the following are true about the /proc filesystem?
⚠ Common exam trap
Many exam-takers confuse /proc with a real filesystem stored on disk, leading them to select Option A, or they mistake its runtime nature for persistent storage (Option D), when in fact /proc is a volatile kernel interface that is mounted automatically at boot (Option E).
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
✓
It is a pseudo-filesystem that contains runtime system information.
Option C is correct because /proc is a pseudo-filesystem (a virtual, kernel-generated filesystem) that exposes runtime system and process information such as /proc/cpuinfo, /proc/meminfo, and per-process directories like /proc/PID, rather than storing real data blocks on disk. Option E is correct because /proc is typically mounted automatically at boot time, commonly via an entry like 'proc /proc proc defaults 0 0' in /etc/fstab or by systemd, since many tools and the kernel expect it to be present early in the boot process. Option A is incorrect because /proc is not formatted with ext4 or any on-disk filesystem; it has no persistent backing store. Option B is incorrect because /proc is not a network filesystem like NFS or CIFS; it is a kernel-internal virtual filesystem. Option D is incorrect because /proc does not store persistent configuration data—it reflects transient kernel and process state, and changes are lost on reboot.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
It is formatted with the ext4 filesystem.
Why it's wrong here
/proc is a virtual pseudo-filesystem with no on-disk block device, so it cannot be formatted with ext4 or any disk filesystem. It is tempting because ext4 is the common Linux root filesystem, but /proc is mounted by the kernel and exists only in memory.
- ✗
It is a network filesystem.
Why it's wrong here
/proc is a kernel-generated virtual filesystem local to each host; it is not exported or accessed over a network. It is tempting because network filesystems like NFS also appear under /proc/mounts, but /proc itself is mounted from the kernel, not a remote server.
- ✓
It is a pseudo-filesystem that contains runtime system information.
Why this is correct
/proc is a virtual, kernel-generated filesystem exposing runtime data such as CPU details, memory usage and process state. Nothing on it occupies disk blocks, satisfying the stem's pseudo-filesystem criterion and distinguishing it from persistent on-disk filesystems.
- ✗
It is used to store persistent configuration data.
Why it's wrong here
/proc is a virtual, in-memory pseudo-filesystem generated by the kernel at runtime; nothing written there persists across reboots. It is tempting because /proc/sys accepts tuning values, but those are runtime kernel parameters, whereas persistent configuration belongs in /etc on a real disk filesystem.
- ✓
It is typically mounted at boot time.
Why this is correct
/proc is mounted automatically during system startup, typically by an init script or systemd unit, before most services begin. This satisfies the stem's boot-time mounting statement and reflects its role as a kernel interface rather than a user-mounted storage device.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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