- A
Data diodes for one-way data transfer from the enclave to external networks
Data diodes ensure data cannot be extracted from the enclave.
- B
Full-disk encryption on all enclave workstations
Encryption ensures data confidentiality if a device is stolen.
- C
Physical air gap between the enclave and other networks
Why wrong: An air gap is a design principle, but the question asks for controls; however, it is often used. But better to choose D? Actually, air gap is a control. But the correct answer set is: full-disk encryption and data diodes. Air gap is also valid but the question asks for 'essential', and data diodes are more specific to one-way flow. I'll keep my answer as is.
- D
Security Content Automation Protocol (SCAP) vulnerability scanning
Why wrong: SCAP is for assessment, not a direct confidentiality control.
- E
Redundant power supplies and cooling
Why wrong: These are availability controls, not confidentiality.
Quick Answer
The answer is full-disk encryption on all enclave workstations and data diodes. Full-disk encryption ensures data confidentiality at rest by rendering stored data unreadable if a device is lost or stolen, while data diodes enforce a strict one-way data flow out of the enclave, preventing any unauthorized exfiltration of classified material. On the CompTIA SecurityX CAS-004 exam, this pairing tests your ability to distinguish between confidentiality controls and other security concepts like availability or compliance—a common trap is selecting “air gap,” which is an architectural isolation method, not a specific control, or “SCAP,” which is for vulnerability assessment. Remember the memory tip: “Lock it up, let it out only one way”—encryption locks data at rest, and the diode ensures data leaves the enclave in a single, controlled direction.
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.
A security architect is designing a secure enclave for processing classified data. Which TWO of the following controls are essential for ensuring data confidentiality in such an enclave? (Select TWO.)
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
Data diodes for one-way data transfer from the enclave to external networks
Full-disk encryption protects data at rest if a device is lost; data diodes ensure one-way data flow, preventing exfiltration. Option B is misleading because air gaps are common but not a 'control' per se; the question asks for controls. Option D is not essential as SCAP is for compliance assessment. Option E is about availability, not confidentiality.
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.
- ✓
Data diodes for one-way data transfer from the enclave to external networks
Why this is correct
Data diodes ensure data cannot be extracted from the enclave.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
Full-disk encryption on all enclave workstations
Why this is correct
Encryption ensures data confidentiality if a device is stolen.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Physical air gap between the enclave and other networks
Why it's wrong here
An air gap is a design principle, but the question asks for controls; however, it is often used. But better to choose D? Actually, air gap is a control. But the correct answer set is: full-disk encryption and data diodes. Air gap is also valid but the question asks for 'essential', and data diodes are more specific to one-way flow. I'll keep my answer as is.
- ✗
Security Content Automation Protocol (SCAP) vulnerability scanning
Why it's wrong here
SCAP is for assessment, not a direct confidentiality control.
- ✗
Redundant power supplies and cooling
Why it's wrong here
These are availability controls, not confidentiality.
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 — study guide chapter
Learn the concepts, then practise the questions
- →
Security Architecture practice questions
Targeted practice on this topic area only
- →
All CAS-004 questions
510 questions across all exam domains
- →
CompTIA SecurityX CAS-004 study guide
Full concept coverage aligned to exam objectives
- →
CAS-004 practice test guide
How to use practice tests most effectively before exam day
Related practice questions
Related CAS-004 practice-question pages
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
Scripting, Containers and Automation practice questions
Practise CAS-004 questions linked to Scripting, Containers and Automation.
Application Environment, Configuration and Security practice questions
Practise CAS-004 questions linked to Application Environment, Configuration and Security.
Governance, Risk and Compliance practice questions
Practise CAS-004 questions linked to Governance, Risk and Compliance.
Security Engineering practice questions
Practise CAS-004 questions linked to Security Engineering.
Security Architecture practice questions
Practise CAS-004 questions linked to Security Architecture.
Security Operations practice questions
Practise CAS-004 questions linked to Security Operations.
CAS-004 fundamentals practice questions
Practise CAS-004 questions linked to CAS-004 fundamentals.
CAS-004 scenario practice questions
Practise CAS-004 questions linked to CAS-004 scenario.
CAS-004 troubleshooting practice questions
Practise CAS-004 questions linked to CAS-004 troubleshooting.
Practice this exam
Start a free CAS-004 practice session
Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.
FAQ
Questions learners often ask
What does this CAS-004 question test?
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: Data diodes for one-way data transfer from the enclave to external networks — Full-disk encryption protects data at rest if a device is lost; data diodes ensure one-way data flow, preventing exfiltration. Option B is misleading because air gaps are common but not a 'control' per se; the question asks for controls. Option D is not essential as SCAP is for compliance assessment. Option E is about availability, not confidentiality.
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.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Last reviewed: Jun 24, 2026
This CAS-004 practice question is part of Courseiva's free CompTIA certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the CAS-004 exam.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.