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 needs to access an S3 bucket. The security team wants to avoid using long-term access keys. What is the most secure approach?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Launch the EC2 instance with an IAM role that grants S3 access.
Option D is correct because assigning an IAM role to an EC2 instance allows the instance to obtain temporary security credentials from the AWS Security Token Service (STS) automatically via the instance metadata service. This eliminates the need to store, rotate, or manage long-term access keys, adhering to the security team's requirement for a credential-less approach. The IAM role's permissions policy grants the EC2 instance access to the S3 bucket, and the credentials are automatically rotated by AWS before they expire.
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.
✗
Generate an access key and secret key for an IAM user and store them on the instance.
Why it's wrong here
Long-term keys are less secure.
✗
Create a new IAM user and store the credentials in S3 with bucket policies.
Why it's wrong here
Long-term keys are still used.
✗
Use AWS Systems Manager Parameter Store to store the credentials and retrieve them at runtime.
Why it's wrong here
Still uses long-term keys stored in Parameter Store.
✓
Launch the EC2 instance with an IAM role that grants S3 access.
Why this is correct
Temporary credentials are automatically rotated.
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 'secure storage' (like Parameter Store or Secrets Manager) with 'no long-term credentials at all,' failing to recognize that an IAM role provides temporary credentials that are inherently more secure and require no key management on the instance.
Detailed technical explanation
How to think about this question
When an EC2 instance is launched with an IAM role, the AWS credential provider chain automatically retrieves temporary credentials from the instance metadata service (IMDS) at http://169.254.169.254/latest/meta-data/iam/security-credentials/. These credentials are signed with a 6-hour expiration by default and are automatically refreshed by the AWS SDKs, ensuring continuous access without manual rotation. In real-world scenarios, this approach also simplifies auditing because all API calls made by the instance are logged in AWS CloudTrail with the role's session context, enabling precise tracking of actions.
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: Launch the EC2 instance with an IAM role that grants S3 access. — Option D is correct because assigning an IAM role to an EC2 instance allows the instance to obtain temporary security credentials from the AWS Security Token Service (STS) automatically via the instance metadata service. This eliminates the need to store, rotate, or manage long-term access keys, adhering to the security team's requirement for a credential-less approach. The IAM role's permissions policy grants the EC2 instance access to the S3 bucket, and the credentials are automatically rotated by AWS before they expire.
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 →
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.