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Question 681 of 1,750

SDLC Automation →mediumMultiple ChoiceObjective-mapped

DOP-C02 SDLC Automation Practice Question

This DOP-C02 practice question tests your understanding of sdlc automation. 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.

You are a DevOps engineer for a company that uses AWS CodePipeline to deploy a microservice to Amazon ECS with Fargate. The pipeline has a source stage (CodeCommit), a build stage (CodeBuild) that builds a Docker image and pushes it to Amazon ECR, and a deploy stage that uses an ECS task definition update. Recently, the deploy stage started failing intermittently with the error 'The task definition does not have a compatibilities attribute set correctly.' The task definition is generated dynamically during the build stage and uses the 'FARGATE' launch type. The error occurs only when a new task definition revision is created. You suspect the issue is related to how the task definition is generated. Upon reviewing the buildspec, you see that the task definition JSON is created using environment variables for the image URI. What is the MOST likely cause and solution?

Clue words in this question

Noticing these words before you look at the options changes how you read each choice.

Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.

A
The task definition is missing the 'executionRoleArn' field, which is required for Fargate.
Why wrong: Missing execution role causes a different error about permissions.
B
The task definition JSON does not include the 'requiresCompatibilities' field with the value '["FARGATE"]'.
Without this field, ECS cannot determine the launch type compatibility.
C
The task definition specifies 'networkMode' as 'bridge', but Fargate requires 'awsvpc'.
Why wrong: Incorrect network mode causes a different error.
D
The task definition does not specify 'cpu' and 'memory' values, which are required for Fargate.
Why wrong: Missing cpu/memory causes a validation error, not a compatibilities error.

Full breakdown with real-world context →

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

✓

The task definition JSON does not include the 'requiresCompatibilities' field with the value '["FARGATE"]'.

Option B is correct because the 'requiresCompatibilities' attribute must be explicitly set to 'FARGATE' for Fargate tasks. Option A is incorrect because the error is about compatibilities, not execution role. Option C is incorrect because network mode should be 'awsvpc', but that is not the error. Option D is incorrect because CPU and memory values are required but would cause a different error.

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.

✗
The task definition is missing the 'executionRoleArn' field, which is required for Fargate.
Why it's wrong here
Missing execution role causes a different error about permissions.
✓
The task definition JSON does not include the 'requiresCompatibilities' field with the value '["FARGATE"]'.
Why this is correct
Without this field, ECS cannot determine the launch type compatibility.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The task definition specifies 'networkMode' as 'bridge', but Fargate requires 'awsvpc'.
Why it's wrong here
Incorrect network mode causes a different error.
✗
The task definition does not specify 'cpu' and 'memory' values, which are required for Fargate.
Why it's wrong here
Missing cpu/memory causes a validation error, not a compatibilities error.

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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.

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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FAQ

Questions learners often ask

What does this DOP-C02 question test?

SDLC Automation — This question tests SDLC Automation — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: The task definition JSON does not include the 'requiresCompatibilities' field with the value '["FARGATE"]'. — Option B is correct because the 'requiresCompatibilities' attribute must be explicitly set to 'FARGATE' for Fargate tasks. Option A is incorrect because the error is about compatibilities, not execution role. Option C is incorrect because network mode should be 'awsvpc', but that is not the error. Option D is incorrect because CPU and memory values are required but would cause a different error.

What should I do if I get this DOP-C02 question wrong?

Are there clue words in this question I should notice?

Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

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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.