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 is deploying a critical microservice on Amazon ECS with Fargate. They need to ensure that the service can tolerate an Availability Zone failure. What is the BEST approach?
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.
Use a cluster placement constraint to spread tasks across instances
Why wrong: Fargate does not use placement constraints.
Use EC2 launch type and spread tasks across instance types
Why wrong: Not applicable to Fargate.
Define the service to spread tasks across multiple Availability Zones
ECS Fargate services can spread across AZs.
Configure service auto scaling to add tasks when CPU is high
Why wrong: Does not directly handle AZ failure.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Define the service to spread tasks across multiple Availability Zones
Spreading tasks across multiple AZs ensures that if one AZ fails, tasks in other AZs continue. Option A is wrong because Fargate doesn't support instance diversity. Option C is wrong because service auto scaling adds tasks but not across AZs. Option D is wrong because cluster placement constraints are not used with Fargate.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Use a cluster placement constraint to spread tasks across instances
Why it's wrong here
Fargate does not use placement constraints.
Use EC2 launch type and spread tasks across instance types
Why it's wrong here
Not applicable to Fargate.
Define the service to spread tasks across multiple Availability Zones
Why this is correct
ECS Fargate services can spread across AZs.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Configure service auto scaling to add tasks when CPU is high
Why it's wrong here
Does not directly handle AZ failure.
Common exam traps
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
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.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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
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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FAQ
Resilient Cloud Solutions — This question tests Resilient Cloud Solutions — Read the scenario before looking for a memorised answer..
The correct answer is: Define the service to spread tasks across multiple Availability Zones — Spreading tasks across multiple AZs ensures that if one AZ fails, tasks in other AZs continue. Option A is wrong because Fargate doesn't support instance diversity. Option C is wrong because service auto scaling adds tasks but not across AZs. Option D is wrong because cluster placement constraints are not used with Fargate.
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.
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.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 20, 2026
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.
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