LPIC-1 Devices, Filesystems and FHS Practice Question
This LPIC-1 practice question tests your understanding of devices, filesystems and fhs. 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.
Exhibit
sysfs on /sys type sysfs (rw,nosuid,nodev,noexec,relatime)
proc on /proc type proc (rw,nosuid,nodev,noexec,relatime)
udev on /dev type devtmpfs (rw,nosuid,relatime,size=100m)
devpts on /dev/pts type devpts (rw,nosuid,noexec,relatime,gid=5,mode=620)
Refer to the exhibit. An administrator notices that /proc is mounted with 'noexec'. What is the impact of this mount option?
sysfs on /sys type sysfs (rw,nosuid,nodev,noexec,relatime)
proc on /proc type proc (rw,nosuid,nodev,noexec,relatime)
udev on /dev type devtmpfs (rw,nosuid,relatime,size=100m)
devpts on /dev/pts type devpts (rw,nosuid,noexec,relatime,gid=5,mode=620)
A
Device files are not interpreted.
Why wrong: That is nodev.
B
Setuid programs do not work.
Why wrong: That is the effect of nosuid, not noexec.
C
No binaries can be executed directly from /proc.
noexec prevents execution of binaries on the filesystem.
D
The filesystem cannot be written to.
Why wrong: noexec does not restrict writes; it prevents execution.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
No binaries can be executed directly from /proc.
The 'noexec' mount option prevents the direct execution of any binary files located on the mounted filesystem. Since /proc is a virtual filesystem that contains runtime system information and process data, mounting it with 'noexec' means that no binaries can be executed directly from /proc. This is a security measure to prevent malicious code from being run from procfs, as /proc should never contain executable programs in normal operation.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Device files are not interpreted.
Why it's wrong here
That is nodev.
✗
Setuid programs do not work.
Why it's wrong here
That is the effect of nosuid, not noexec.
✓
No binaries can be executed directly from /proc.
Why this is correct
noexec prevents execution of binaries on the filesystem.
Related concept
Read the scenario before looking for a memorised answer.
✗
The filesystem cannot be written to.
Why it's wrong here
noexec does not restrict writes; it prevents execution.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse 'noexec' with 'nosuid' or 'nodev', thinking it affects setuid binaries or device files, when in fact 'noexec' strictly controls whether binary executables can be run directly from the filesystem.
Detailed technical explanation
How to think about this question
Under the hood, the 'noexec' option works by clearing the execute permission bits on all files within the mounted filesystem at the VFS (Virtual File System) level, regardless of the actual file permissions. This means that even if a file in /proc has execute permissions set, the kernel will refuse to load it via execve() syscall. A subtle behavior is that 'noexec' does not prevent execution of scripts that are passed as arguments to an interpreter (e.g., 'bash /proc/self/status' still works), because the interpreter reads the file content rather than executing the file directly.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the LPIC-1 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
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Devices, Filesystems and FHS — This question tests Devices, Filesystems and FHS — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: No binaries can be executed directly from /proc. — The 'noexec' mount option prevents the direct execution of any binary files located on the mounted filesystem. Since /proc is a virtual filesystem that contains runtime system information and process data, mounting it with 'noexec' means that no binaries can be executed directly from /proc. This is a security measure to prevent malicious code from being run from procfs, as /proc should never contain executable programs in normal operation.
What should I do if I get this LPIC-1 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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