The answer is that the task execution role lacks the required permissions to pull from ECR. This is correct because in Amazon ECS with Fargate, the task execution role—not the task role—is the IAM entity responsible for pulling container images from Amazon ECR on your behalf. Without explicit policies granting actions like ecr:GetDownloadUrlForLayer, ecr:BatchGetImage, and ecr:BatchCheckLayerAvailability, the default task execution role cannot authenticate or download the image, causing the pull to fail. On the AWS Certified Developer Associate DVA-C02 exam, this concept tests your understanding of the separation between the execution role (for infrastructure tasks 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 default role comes pre-configured with ECR access. Memory tip: think of the execution role as the “puller” and the task role as the “user”—the puller must have the ECR keys to open the registry door.
DVA-C02 Troubleshooting and Optimization Practice Question
This DVA-C02 practice question tests your understanding of troubleshooting and optimization. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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.
An application running on Amazon ECS with Fargate is unable to pull an image from Amazon ECR. The task definition uses the 'default' task execution role. 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 does not have permissions to pull from ECR.
Option D is correct because when using Amazon ECS with Fargate, the task execution role (not the task role) is responsible for pulling container images from Amazon ECR. The 'default' task execution role is created automatically but lacks the necessary permissions (e.g., ecr:GetDownloadUrlForLayer, ecr:BatchGetImage, and ecr:BatchCheckLayerAvailability) unless explicitly attached via an IAM policy. Since the question states the task definition uses the 'default' task execution role, the most likely cause is that this role does not have the required ECR permissions.
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 role does not have permissions to access ECR.
Why it's wrong here
The task role is for the application, not for pulling images.
✗
The ECS cluster does not have permissions to access ECR.
Why it's wrong here
The cluster does not need permissions; the task execution role does.
✗
The ECS service role does not have permissions to access ECR.
Why it's wrong here
The service role is for load balancing, not image pulling.
✓
The task execution role does not have permissions to pull from ECR.
Why this is correct
The execution role needs ecr:GetDownloadUrlForLayer and ecr:BatchGetImage permissions.
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.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse the task execution role with the task role, assuming the task role handles all permissions including image pulling, when in fact the task execution role is a separate IAM role specifically required for ECR image pulls and CloudWatch Logs.
Detailed technical explanation
How to think about this question
Under the hood, when ECS with Fargate launches a task, the ECS agent on the Fargate infrastructure uses the task execution role to authenticate with ECR via the AWS CLI or SDK, retrieving temporary credentials from AWS STS. The agent then calls the ECR API operations (e.g., GetAuthorizationToken, BatchGetImage) to pull the image layers. A real-world scenario where this matters is when a developer mistakenly attaches ECR permissions to the task role instead of the task execution role, causing image pull failures even though the application code has full access to other AWS services.
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.
TExam Day Tips
→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 exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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 does not have permissions to pull from ECR. — Option D is correct because when using Amazon ECS with Fargate, the task execution role (not the task role) is responsible for pulling container images from Amazon ECR. The 'default' task execution role is created automatically but lacks the necessary permissions (e.g., ecr:GetDownloadUrlForLayer, ecr:BatchGetImage, and ecr:BatchCheckLayerAvailability) unless explicitly attached via an IAM policy. Since the question states the task definition uses the 'default' task execution role, the most likely cause is that this role does not have the required ECR permissions.
What should I do if I get this DVA-C02 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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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