This SCS-C02 practice question tests your understanding of infrastructure 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. The Security Engineer wants to ensure that the EC2 instances do not have access keys and that the access is restricted to only the required bucket. What is the most secure way to provide this access?
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 with a policy that allows access to the specific S3 bucket, and attach the role to the EC2 instance profile.
Option A is correct because an IAM role with a policy that grants access to the specific bucket and attached to an instance profile is the most secure and scalable method. Option B is wrong because storing access keys in the instance is insecure. Option C is wrong because using the root user's credentials is highly insecure. Option D is wrong because a bucket policy alone does not grant access to EC2 instances; the instances need credentials to sign requests.
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 for an IAM user with permissions to the S3 bucket and store it in the EC2 instance.
Why it's wrong here
Storing access keys on the instance is a security risk; keys can be compromised.
✗
Create an S3 bucket policy that allows the EC2 instance's public IP address to access the bucket.
Why it's wrong here
Bucket policies do not grant access to EC2 instances; the instances need AWS credentials.
✓
Create an IAM role with a policy that allows access to the specific S3 bucket, and attach the role to the EC2 instance profile.
Why this is correct
This uses temporary credentials and least privilege.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use the root user's access keys to configure the application.
Why it's wrong here
Root user credentials should never be used for applications; they have full access.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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 SCS-C02 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Infrastructure Security — This question tests Infrastructure 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 with a policy that allows access to the specific S3 bucket, and attach the role to the EC2 instance profile. — Option A is correct because an IAM role with a policy that grants access to the specific bucket and attached to an instance profile is the most secure and scalable method. Option B is wrong because storing access keys in the instance is insecure. Option C is wrong because using the root user's credentials is highly insecure. Option D is wrong because a bucket policy alone does not grant access to EC2 instances; the instances need credentials to sign requests.
What should I do if I get this SCS-C02 question wrong?
Identify which SCS-C02 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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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