The correct answer is to drop all capabilities except those required for the application, use minimal base images, and enforce a read-only file system. These three practices directly reduce the container attack surface by limiting kernel access, eliminating unnecessary software components that could harbor vulnerabilities, and preventing malware from writing to the filesystem. On the CompTIA SecurityX CAS-004 exam, this objective tests your ability to apply secure baseline configurations within container orchestration, often appearing as a multi-select question where distractors like data encryption or authentication mechanisms are incorrectly chosen. A common trap is confusing data-at-rest protection with attack surface reduction—remember that minimizing what runs and what can touch the kernel is the core goal. Memory tip: think "Drop, Strip, Lock"—drop capabilities, strip the image to its essentials, and lock the filesystem to read-only.
CAS-004 Security Architecture Practice Question
This CAS-004 practice question tests your understanding of security architecture. 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.
When evaluating the security architecture of a containerized application, which THREE of the following practices should be implemented to minimize the attack surface? (Select THREE.)
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "minimum / minimize"
Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use minimal base images (e.g., Alpine Linux) instead of full OS images
Using minimal base images reduces vulnerabilities; read-only file system prevents malware persistence; dropping unnecessary capabilities limits kernel attack surface. Option B is not about attack surface reduction; it's about data protection. Option C is about authentication, not attack surface.
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.
✗
Encrypt sensitive data at rest within the container
Why it's wrong here
Encryption protects data but does not reduce attack surface.
✓
Use minimal base images (e.g., Alpine Linux) instead of full OS images
Why this is correct
Smaller images have fewer packages and vulnerabilities.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Implement multi-factor authentication for container registries
Why it's wrong here
MFA secures access but does not reduce the container's attack surface.
✓
Set container file systems to read-only where possible
Why this is correct
Read-only prevents unauthorized writes and malware installation.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✓
Drop all capabilities except those required for the application
The clue word "minimum / minimize" in the question point toward this answer.
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 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.
Security Architecture — This question tests Security Architecture — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use minimal base images (e.g., Alpine Linux) instead of full OS images — Using minimal base images reduces vulnerabilities; read-only file system prevents malware persistence; dropping unnecessary capabilities limits kernel attack surface. Option B is not about attack surface reduction; it's about data protection. Option C is about authentication, not attack surface.
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.
Are there clue words in this question I should notice?
Yes — watch for: "minimum / minimize". Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
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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