This LPIC-2 practice question tests your understanding of system security. 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.
An administrator wants to create a chroot environment for a potentially compromised service. The service needs to read /etc/resolv.conf and /etc/hosts, and run from a directory /chroot/service. Which of the following steps is essential to ensure the chroot environment is secure and functional?
Why wrong: Read-only is a security precaution but not required for basic operation.
B
Mount /proc within the chroot jail.
Why wrong: While /proc may be needed, it is secondary to device nodes; but it is often mounted. The question asks 'essential', and device nodes are more fundamental.
C
Copy only the service binaries and configuration files into the chroot.
Why wrong: This may miss necessary device nodes and libraries, leading to failures.
D
Create /dev/null and /dev/random inside the chroot using mknod.
Device files are required for many system calls; without them, the service may crash or hang.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Create /dev/null and /dev/random inside the chroot using mknod.
Option B is correct because the chroot environment must contain the necessary device files for system calls. Option A is wrong because copying binaries into the chroot is not always sufficient; they must be linked against libraries available inside. Option C is wrong because /proc should be mounted for some services but not essential for basic resolution files; however, it is often needed. Option D is wrong because setting the jail to read-only filesystem is a security measure but not essential for functionality. The most essential step is to create device nodes (like /dev/null, /dev/random) because many services require them.
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.
✗
Set the chroot directory to be read-only.
Why it's wrong here
Read-only is a security precaution but not required for basic operation.
✗
Mount /proc within the chroot jail.
Why it's wrong here
While /proc may be needed, it is secondary to device nodes; but it is often mounted. The question asks 'essential', and device nodes are more fundamental.
✗
Copy only the service binaries and configuration files into the chroot.
Why it's wrong here
This may miss necessary device nodes and libraries, leading to failures.
✓
Create /dev/null and /dev/random inside the chroot using mknod.
Why this is correct
Device files are required for many system calls; without them, the service may crash or hang.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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-2 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 LPIC-2 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
System Security — This question tests System Security — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Create /dev/null and /dev/random inside the chroot using mknod. — Option B is correct because the chroot environment must contain the necessary device files for system calls. Option A is wrong because copying binaries into the chroot is not always sufficient; they must be linked against libraries available inside. Option C is wrong because /proc should be mounted for some services but not essential for basic resolution files; however, it is often needed. Option D is wrong because setting the jail to read-only filesystem is a security measure but not essential for functionality. The most essential step is to create device nodes (like /dev/null, /dev/random) because many services require them.
What should I do if I get this LPIC-2 question wrong?
Identify which LPIC-2 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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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