- A
Store AWS access keys as environment variables in the task definition.
Why wrong: Storing credentials as environment variables is insecure because they can be exposed in logs or through container inspection.
- B
Create an IAM task role and reference it in the task definition using the 'taskRoleArn' parameter.
The ECS task role provides temporary credentials to the container, and the AWS SDK automatically retrieves them. This is the recommended secure practice.
- C
Create an IAM user and embed its credentials in the container image.
Why wrong: Embedding credentials in the container image is insecure and makes rotation difficult. It also violates the principle of least privilege.
- D
Use an S3 bucket policy that grants access based on the security group of the ECS tasks.
Why wrong: Security groups are network-level constructs and cannot be used as principals in IAM policies; S3 bucket policies require IAM principals, not security groups.
Quick Answer
The correct answer is to create an IAM task role and reference it in the task definition using the 'taskRoleArn' parameter. This approach is correct because ECS Fargate tasks support IAM task roles, which allow the containerized application to assume a role that grants only the necessary S3 permissions via temporary credentials obtained from AWS STS, rather than embedding long-lived keys in the code. On the AWS Certified Developer Associate DVA-C02 exam, this scenario tests your understanding of how to apply the principle of least privilege to container workloads, often appearing as a distractor against options that suggest using an instance profile or hardcoding credentials. A common trap is confusing the task role with the execution role—remember that the task role grants permissions to the application inside the container, while the execution role is for pulling images and logs. For a memory tip, think "task role for the app, execution role for the infrastructure."
DVA-C02 Security Practice Question
This DVA-C02 practice question tests your understanding of security. 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.
A developer is deploying a containerized application on Amazon ECS with the Fargate launch type. The application needs to read data from an Amazon S3 bucket. The developer wants to follow the principle of least privilege. How should the developer grant the necessary permissions to the ECS tasks?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"least"Why it matters: You want the option with minimum overhead, fewest steps, or lowest impact — not the most feature-rich or comprehensive answer.
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
Create an IAM task role and reference it in the task definition using the 'taskRoleArn' parameter.
Option B is correct because Amazon ECS with the Fargate launch type supports IAM task roles, which allow you to assign an IAM role to the ECS task itself. By referencing the IAM task role in the task definition using the 'taskRoleArn' parameter, the containerized application can securely obtain temporary credentials from the ECS container agent via the AWS STS service, adhering to the principle of least privilege without embedding long-lived credentials.
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.
- ✗
Store AWS access keys as environment variables in the task definition.
Why it's wrong here
Storing credentials as environment variables is insecure because they can be exposed in logs or through container inspection.
- ✓
Create an IAM task role and reference it in the task definition using the 'taskRoleArn' parameter.
Why this is correct
The ECS task role provides temporary credentials to the container, and the AWS SDK automatically retrieves them. This is the recommended secure practice.
Clue confirmation
The clue word "least" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Create an IAM user and embed its credentials in the container image.
Why it's wrong here
Embedding credentials in the container image is insecure and makes rotation difficult. It also violates the principle of least privilege.
- ✗
Use an S3 bucket policy that grants access based on the security group of the ECS tasks.
Why it's wrong here
Security groups are network-level constructs and cannot be used as principals in IAM policies; S3 bucket policies require IAM principals, not security groups.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may confuse IAM roles with IAM users or think that network-level controls like security groups can be used for S3 access, but AWS S3 does not evaluate security groups for authorization; only IAM policies and bucket policies are evaluated.
Detailed technical explanation
How to think about this question
Under the hood, when an ECS task with a task role is launched, the ECS container agent retrieves temporary credentials from the AWS STS service using the task role's trust policy and exposes them via the AWS_CONTAINER_CREDENTIALS_RELATIVE_URI environment variable. The AWS SDKs automatically use this endpoint to obtain credentials, enabling seamless and secure access to S3 without any hardcoded keys. In a real-world scenario, if the application needs to access multiple AWS services, you can attach a single task role with a policy that grants only the required actions, and the credentials are automatically rotated every few hours by STS.
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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
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.
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FAQ
Questions learners often ask
What does this DVA-C02 question test?
Security — This question tests Security — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Create an IAM task role and reference it in the task definition using the 'taskRoleArn' parameter. — Option B is correct because Amazon ECS with the Fargate launch type supports IAM task roles, which allow you to assign an IAM role to the ECS task itself. By referencing the IAM task role in the task definition using the 'taskRoleArn' parameter, the containerized application can securely obtain temporary credentials from the ECS container agent via the AWS STS service, adhering to the principle of least privilege without embedding long-lived credentials.
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: "least". You want the option with minimum overhead, fewest steps, or lowest impact — not the most feature-rich or comprehensive answer.
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 →
Same concept, more angles
1 more ways this is tested on DVA-C02
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 developer is deploying a web application on Amazon ECS with a Fargate launch type. The application needs to securely access an Amazon DynamoDB table. How should the developer grant permissions?
medium- A.Store AWS credentials in the container image
- ✓ B.Define a task role for the ECS task with DynamoDB permissions
- C.Assign an IAM role to the ECS service and use it from the container
- D.Use an EC2 instance profile and mount it to the container
Why B: For ECS tasks with Fargate, you define a task execution role and a task role. The task role grants permissions to the containers to access AWS services like DynamoDB.
Last reviewed: Jun 11, 2026
This DVA-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 DVA-C02 exam.
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