The answer is deploying identical stacks in two regions with Route 53 weighted routing and DynamoDB global tables. This architecture achieves true multi-region active-active high availability because Route 53 distributes traffic across both regions simultaneously, while DynamoDB global tables handle multi-master data replication automatically, ensuring no single region becomes a bottleneck or single point of failure. On the CompTIA SecurityX CAS-004 exam, this scenario tests your ability to distinguish between active-active, active-passive, and single-region designs under the domain of cloud security architecture—a common trap is choosing active-passive, which requires manual failover and violates the “no human intervention” requirement. Remember the mnemonic “Twin Stacks, Twin Tables, Twin Traffic” to recall that both compute stacks and database tables must be duplicated and live, with traffic split across both regions for automatic region failure survival.
CAS-004 Security Engineering Practice Question
This CAS-004 practice question tests your understanding of security engineering. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 cloud security architect is designing a multi-region active-active application. The application must maintain high availability even if an entire AWS region fails. Which architecture BEST meets this requirement?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Deploy identical stacks in two regions with Route 53 weighted routing and DynamoDB global tables
Active-active across two regions with Route 53 weighted routing and DynamoDB global tables provides automatic failover and data replication without human intervention. Single-region setups cannot survive a region outage. Active-passive requires manual failover.
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.
✗
Active-active in one region with auto scaling
Why it's wrong here
Still single region; a region outage takes down the entire application.
✓
Deploy identical stacks in two regions with Route 53 weighted routing and DynamoDB global tables
Why this is correct
This provides active-active multi-region with automatic traffic distribution and data replication.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Single region with multiple AZs and RDS Multi-AZ
Why it's wrong here
This only protects against AZ failure, not a full region outage.
✗
Two regions with active-passive failover using Route 53 health checks
Why it's wrong here
Active-passive requires failover time and is not truly active-active.
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 Engineering — This question tests Security Engineering — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Deploy identical stacks in two regions with Route 53 weighted routing and DynamoDB global tables — Active-active across two regions with Route 53 weighted routing and DynamoDB global tables provides automatic failover and data replication without human intervention. Single-region setups cannot survive a region outage. Active-passive requires manual failover.
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: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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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