- A
Configure the ECS service to spread tasks across multiple Availability Zones.
Spreading tasks across AZs prevents total loss from a single AZ failure.
- B
Disable managed service scaling to avoid resource contention.
Why wrong: Disabling scaling reduces resilience.
- C
Use a multi-AZ Amazon RDS or DynamoDB for persistent data.
Multi-AZ databases ensure data availability during AZ failures.
- D
Deploy an Application Load Balancer (ALB) with targets in multiple Availability Zones.
Multi-AZ ALB distributes traffic and survives AZ failures.
- E
Use a single service discovery namespace for all tasks.
Why wrong: Service discovery does not provide AZ resilience.
Question 461 of 1,750
DOP-C02 Resilient Cloud Solutions Practice Question
This DOP-C02 practice question tests your understanding of resilient cloud solutions. 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 company runs a containerized application on Amazon ECS with Fargate. The application needs to be resilient to Availability Zone failures. Which THREE actions should the company take? (Choose THREE.)
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
✓
Configure the ECS service to spread tasks across multiple Availability Zones.
Option A is correct because spreading tasks across multiple Availability Zones ensures that an AZ failure does not impact all tasks, increasing resilience. Option C is correct because using a multi-AZ Amazon RDS or DynamoDB provides persistent data storage that survives AZ failures. Option D is correct because an Application Load Balancer with targets in multiple AZs distributes traffic and can route requests to healthy targets in other AZs if one fails. Option B is wrong because disabling managed service scaling reduces the application's ability to handle load changes and may impact availability. Option E is wrong because a single service discovery namespace does not provide AZ resilience; it only provides service discovery without redundancy across AZs.
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.
- ✓
Configure the ECS service to spread tasks across multiple Availability Zones.
Why this is correct
Spreading tasks across AZs prevents total loss from a single AZ failure.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Disable managed service scaling to avoid resource contention.
Why it's wrong here
Disabling scaling reduces resilience.
- ✓
Use a multi-AZ Amazon RDS or DynamoDB for persistent data.
Why this is correct
Multi-AZ databases ensure data availability during AZ failures.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
Deploy an Application Load Balancer (ALB) with targets in multiple Availability Zones.
Why this is correct
Multi-AZ ALB distributes traffic and survives AZ failures.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Use a single service discovery namespace for all tasks.
Why it's wrong here
Service discovery does not provide AZ resilience.
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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
What to study next
Got this wrong? Here's your next step.
Identify which DOP-C02 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.
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Resilient Cloud Solutions — study guide chapter
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FAQ
Questions learners often ask
What does this DOP-C02 question test?
Resilient Cloud Solutions — This question tests Resilient Cloud Solutions — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Configure the ECS service to spread tasks across multiple Availability Zones. — Option A is correct because spreading tasks across multiple Availability Zones ensures that an AZ failure does not impact all tasks, increasing resilience. Option C is correct because using a multi-AZ Amazon RDS or DynamoDB provides persistent data storage that survives AZ failures. Option D is correct because an Application Load Balancer with targets in multiple AZs distributes traffic and can route requests to healthy targets in other AZs if one fails. Option B is wrong because disabling managed service scaling reduces the application's ability to handle load changes and may impact availability. Option E is wrong because a single service discovery namespace does not provide AZ resilience; it only provides service discovery without redundancy across AZs.
What should I do if I get this DOP-C02 question wrong?
Identify which DOP-C02 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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Last reviewed: Jun 20, 2026
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