The answer is that the container can read host files at /data/config, but not write. This is correct because the mount configuration specifies the read-only (ro) flag, which enforces a critical security boundary: the containerized process has no write access to the underlying host directory, preventing accidental or malicious modification of sensitive configuration files. On the CompTIA SecurityX CAS-004 exam, this scenario tests your understanding of Docker bind mount security implications, specifically how read-only mounts mitigate host file tampering risks while still allowing necessary data access. A common trap is assuming a bind mount grants full filesystem control or that the ro flag is optional for security—it is not. Remember the mnemonic “RO for Read-Only, RW for Risky Write” to quickly recall that read-only mounts are the safer default when containers only need to consume host data.
CAS-004 Scripting, Containers and Automation Practice Question
This CAS-004 practice question tests your understanding of scripting, containers and automation. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The container can read host files at /data/config, but not write.
Option B is correct because the mount is read-only (ro), so the container can read host files but not write. Option A is false. Options C and D are incorrect as the mount is a bind mount, not allowing additional mounts or full filesystem access.
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.
✗
The container can modify files on the host at /data/config.
Why it's wrong here
The mode 'ro' indicates read-only, not writable.
✗
The container has full access to the host's filesystem.
Why it's wrong here
Access is limited to the bound directory, not the entire filesystem.
✓
The container can read host files at /data/config, but not write.
Why this is correct
Read-only bind mount allows reading, no writing.
Related concept
Read the scenario before looking for a memorised answer.
✗
The container can mount additional filesystems using the bind mount.
Why it's wrong here
The mount is already defined and does not grant mounting capability.
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 CAS-004 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 CAS-004 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.
Scripting, Containers and Automation — This question tests Scripting, Containers and Automation — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The container can read host files at /data/config, but not write. — Option B is correct because the mount is read-only (ro), so the container can read host files but not write. Option A is false. Options C and D are incorrect as the mount is a bind mount, not allowing additional mounts or full filesystem access.
What should I do if I get this CAS-004 question wrong?
Identify which CAS-004 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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