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 needs to access an S3 bucket securely. Which of the following is the BEST practice for managing credentials?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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 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.
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 AWS access key and secret key in a configuration file on the EC2 instance.
Why it's wrong here
Insecure, long-term keys.
✗
Use an IAM user with programmatic access and attach a policy allowing S3 access.
Why it's wrong here
Still uses long-term keys.
✓
Launch the EC2 instance with an IAM role that grants S3 access.
Why this is correct
Best practice, temporary credentials.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use a shared secret key stored in AWS Secrets Manager and retrieve it at runtime.
Why it's wrong here
Overkill, not designed for EC2 machine access.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse IAM users with IAM roles, mistakenly thinking that creating a dedicated IAM user with programmatic access is a secure practice, when in fact IAM roles are the correct and secure method for EC2-to-S3 access because they eliminate the need to manage long-term credentials.
Detailed technical explanation
How to think about this question
When an EC2 instance is launched with an IAM role, the AWS STS service issues temporary security credentials that are automatically made available via the instance metadata service at http://169.254.169.254/latest/meta-data/iam/security-credentials/. The AWS SDKs and CLI automatically refresh these credentials before they expire (default 6 hours), ensuring continuous access without manual intervention. This mechanism also supports fine-grained access control through IAM policies and can be combined with S3 bucket policies for cross-account access scenarios.
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 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.
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: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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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
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