The correct answer involves deploying an Application Load Balancer with targets in multiple Availability Zones, spreading ECS Fargate tasks across those zones, and storing application state in a multi-AZ database like DynamoDB or RDS. This combination ensures ECS Fargate multi-AZ resilience by distributing compute and traffic across isolated infrastructure, so a single zone failure cannot take down the entire service. On the AWS Certified DevOps Engineer Professional DOP-C02 exam, this question tests your understanding of designing for fault tolerance at both the compute and data layers, a core DevOps principle. A common trap is assuming a single service discovery namespace or disabling managed scaling provides zone redundancy—neither does. Remember the three pillars of AZ resilience for Fargate: spread tasks, balance traffic with a multi-AZ ALB, and persist state in a multi-AZ database. A useful memory tip is "Spread, Balance, Persist" to recall the three required actions.
DOP-C02 Resilient Cloud Solutions Practice Question
This DOP-C02 practice question tests your understanding of resilient cloud solutions. 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 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 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 AZs ensures that an AZ failure does not affect all tasks. Option C is correct because using a multi-AZ ALB distributes traffic across AZs. Option E is correct because storing state in a multi-AZ database like DynamoDB or RDS ensures data durability. Option B is wrong because a single service discovery namespace does not provide AZ resilience. Option D is wrong because disabling managed scaling may reduce availability.
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
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
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.
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 AZs ensures that an AZ failure does not affect all tasks. Option C is correct because using a multi-AZ ALB distributes traffic across AZs. Option E is correct because storing state in a multi-AZ database like DynamoDB or RDS ensures data durability. Option B is wrong because a single service discovery namespace does not provide AZ resilience. Option D is wrong because disabling managed scaling may reduce availability.
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.
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 →
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A company runs a microservices application on Amazon ECS with Fargate. The application includes a service that processes orders and stores them in an RDS PostgreSQL database. The company wants to ensure that the order service is resilient to AZ failures and can handle a sudden increase in order volume. Which TWO actions should the DevOps engineer take? (Choose TWO.)
medium
A.Increase the CPU and memory limits for the ECS task definition.
B.Place an Amazon CloudFront distribution in front of the order service.
✓ C.Deploy the RDS instance in a Multi-AZ configuration.
✓ D.Configure the ECS service to run tasks in multiple Availability Zones.
E.Use RDS Proxy to manage database connections.
Why C: Option C is correct because deploying the RDS instance in a Multi-AZ configuration provides automatic failover to a standby replica in a different Availability Zone, ensuring database resilience to AZ failures. Option D is correct because configuring the ECS service to run tasks in multiple Availability Zones distributes the order processing workload across AZs, improving both fault tolerance and scalability during sudden traffic spikes.
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This DOP-C02 practice question is part of Courseiva's free Amazon Web Services 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 DOP-C02 exam.
Question Discussion
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