The answer is the task execution role lacks permissions to pull from ECR. This is because when ECS Fargate attempts to pull a container image from Amazon ECR, it uses the task execution role—an IAM role assumed by the ECS agent—to authenticate and download the image layers. Without the required `ecr:GetDownloadUrlForLayer` and `ecr:BatchGetImage` permissions attached to that role, the pull request is denied, causing the task to fail with an image pull error. On the AWS Certified Developer Associate DVA-C02 exam, this scenario tests your understanding of the separation between the task execution role (for infrastructure actions like pulling images and writing logs) and the task role (for application-level AWS API calls). A common trap is confusing these two roles or assuming the issue is with CPU/memory limits, which would produce a different error. Memory tip: think "execution role for execution actions" — pulling an image is an execution action, so it needs execution role permissions.
DVA-C02 Troubleshooting and Optimization Practice Question
This DVA-C02 practice question tests your understanding of troubleshooting and optimization. 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 developer is deploying a new version of an application to Amazon ECS using the Fargate launch type. The task fails to start and the error message indicates that the task cannot pull the container image from Amazon ECR. What is the MOST likely cause?
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.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The task execution role lacks permissions to pull from ECR.
Option A is correct because the task execution role needs ecr:GetDownloadUrlForLayer and ecr:BatchGetImage permissions. Option B is wrong because Fargate does not use a host port mapping. Option C is wrong because CPU/memory limits would cause task failure, not image pull error. Option D is wrong because task definition family is not related to image pull.
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 family name is incorrect.
Why it's wrong here
Family name is used for revision, not for image pull.
✓
The task execution role lacks permissions to pull from ECR.
Why this is correct
Without proper ECR permissions, the task cannot pull the image.
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 container port is not mapped to a host port.
Why it's wrong here
Port mapping is not required for Fargate and does not affect image pull.
✗
The CPU or memory limits are too low for the container.
Why it's wrong here
Would cause task failure later, not image pull 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 DVA-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.
Troubleshooting and Optimization — This question tests Troubleshooting and Optimization — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The task execution role lacks permissions to pull from ECR. — Option A is correct because the task execution role needs ecr:GetDownloadUrlForLayer and ecr:BatchGetImage permissions. Option B is wrong because Fargate does not use a host port mapping. Option C is wrong because CPU/memory limits would cause task failure, not image pull error. Option D is wrong because task definition family is not related to image pull.
What should I do if I get this DVA-C02 question wrong?
Identify which DVA-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.
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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Question Discussion
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