The correct approach is to create an IAM role and attach it to the EC2 instance profile. This works because the instance profile allows the EC2 instance to assume the IAM role and automatically retrieve temporary, rotating security credentials from AWS Security Token Service (STS) via the instance metadata service (IMDS), completely eliminating the need to hard-code long-term keys on the instance. On the AWS Certified Developer Associate DVA-C02 exam, this scenario tests your understanding of secure credential management and the principle of least privilege—a common trap is choosing to store access keys in a config file or using environment variables, which violates the security requirement. Remember that IAM roles for EC2 are the only way to grant EC2 instances secure access to S3 without hard-coded keys, as the credentials are never stored on disk and are automatically rotated. A helpful memory tip: “Roles rotate, keys stay—attach the role to keep keys away.”
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.
An application running on EC2 instances in an Auto Scaling group needs to access an S3 bucket. The security team wants to avoid storing long-term AWS credentials on the instances. Which approach should be used?
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 role and attach it to the EC2 instance profile.
Option B is correct because it uses an IAM role attached to an EC2 instance profile, which allows the EC2 instances to automatically obtain temporary security credentials from the AWS Security Token Service (STS). This approach eliminates the need to store long-term credentials on the instances, as the credentials are rotated automatically and are retrieved via the instance metadata service (IMDS).
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 the credentials in AWS Systems Manager Parameter Store and retrieve them in User Data.
Why it's wrong here
This still uses long-term credentials.
✓
Create an IAM role and attach it to the EC2 instance profile.
Why this is correct
The SDK automatically retrieves temporary credentials from the instance metadata.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use an AWS Lambda function to generate temporary credentials and pass them to the instances.
Why it's wrong here
This adds complexity and still requires secure delivery of credentials.
✗
Generate access keys for a dedicated IAM user and store them in a file on the AMI.
Why it's wrong here
Long-term credentials are not recommended; rotating them is cumbersome.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may think storing credentials in Parameter Store or using Lambda to generate temporary credentials is more secure, but they overlook that an IAM role with an instance profile is the simplest and most secure method because it eliminates the need to handle credentials at all.
Detailed technical explanation
How to think about this question
Under the hood, when an IAM role is attached to an EC2 instance profile, the instance retrieves temporary credentials from the instance metadata service (IMDS) at http://169.254.169.254/latest/meta-data/iam/security-credentials/. These credentials are automatically rotated by AWS STS every few hours, and the AWS SDKs handle the refresh transparently. A real-world scenario where this matters is in a production Auto Scaling group where instances are frequently launched and terminated; using an IAM role ensures that each new instance automatically has the correct permissions without manual intervention or credential rotation.
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.
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 role and attach it to the EC2 instance profile. — Option B is correct because it uses an IAM role attached to an EC2 instance profile, which allows the EC2 instances to automatically obtain temporary security credentials from the AWS Security Token Service (STS). This approach eliminates the need to store long-term credentials on the instances, as the credentials are rotated automatically and are retrieved via the instance metadata service (IMDS).
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.
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 →
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 an application on EC2 that must access an S3 bucket. The developer wants to avoid hard-coding credentials. What is the MOST secure way to grant access?
hard
A.Use an S3 bucket policy that allows access from the EC2 instance's public IP address.
✓ B.Create an IAM role and attach it to the EC2 instance profile.
C.Set the AWS credentials as environment variables in the user data script.
D.Store the AWS access key ID and secret access key in a configuration file on the instance.
Why B: Creating an IAM role with an instance profile and assigning it to the EC2 instance is the most secure method. It provides temporary credentials automatically via the EC2 metadata service. Option A is wrong because storing keys in a config file is not secure. Option B is wrong because S3 bucket policies are resource-based and should be used in combination with IAM roles, but the primary method is the instance profile. Option D is wrong because environment variables can be read by processes and are less secure than instance profiles.
Variation 2. A developer is deploying an application on EC2 that must access an S3 bucket and an SQS queue. The developer wants to follow the principle of least privilege. Which THREE steps should be taken?
hard
A.Attach the IAM role directly to the EC2 instance as a security group.
✓ B.Configure an SQS queue policy that grants access to the IAM role.
✓ C.Create an IAM role with permissions to access S3 and SQS.
✓ D.Configure an S3 bucket policy that grants access to the IAM role.
E.Attach an IAM policy directly to the EC2 instance.
Why B: Option A is correct because an IAM role grants temporary credentials to EC2. Option C is correct because a bucket policy can allow access from the role. Option D is correct because an SQS queue policy can allow access from the role. Option B is wrong because attaching a policy to the EC2 instance is not possible; policies are attached to roles. Option E is wrong because the role should be attached to the instance profile, not the instance directly.
Variation 3. An application running on EC2 instances needs to access an S3 bucket securely. Which of the following is the BEST practice for managing credentials?
easy
A.Store the AWS access key and secret key in a configuration file on the EC2 instance.
B.Use an IAM user with programmatic access and attach a policy allowing S3 access.
✓ C.Launch the EC2 instance with an IAM role that grants S3 access.
D.Use a shared secret key stored in AWS Secrets Manager and retrieve it at runtime.
Why C: Option C is correct because assigning an IAM role to an EC2 instance is the AWS-recommended best practice for securely granting permissions to AWS services. The instance automatically obtains temporary security credentials from the instance metadata service (IMDS), eliminating the need to hardcode or manage long-term access keys. This approach follows the principle of least privilege and avoids the security risks of storing credentials on disk.
Last reviewed: Jun 24, 2026
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
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.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.