The answer is the VPC endpoint policy for S3 does not allow the required action. This is because a VPC endpoint policy acts as an additional layer of authorization that can explicitly deny access to specific S3 buckets or actions, overriding permissions granted by an IAM role. Even when an IAM role correctly allows s3:GetObject on the target bucket, the endpoint policy can block the request if it does not include that bucket or action, resulting in an 'Access Denied' error from the EC2 instance. On the AWS Certified Security Specialty SCS-C02 exam, this scenario tests your understanding of how multiple policy evaluation points—IAM, bucket policies, and endpoint policies—interact, with the endpoint policy being a common trap because it is often overlooked. Remember the memory tip: "Endpoint policies are the gatekeeper—they can deny what IAM allows."
SCS-C02 Identity and Access Management Practice Question
This SCS-C02 practice question tests your understanding of identity and access management. 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 company uses an IAM role to allow an EC2 instance to access an S3 bucket. The instance is launched in a VPC with a VPC endpoint for S3. The IAM role has a policy that grants s3:GetObject on the bucket. However, the application on the instance receives 'Access Denied' errors when trying to read objects. What is the MOST likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The VPC endpoint policy for S3 does not allow the required action.
Option B is correct because a VPC endpoint policy can restrict access to specific buckets, and if it does not allow the target bucket, requests will be denied even if the IAM role allows it. Option A is wrong because the S3 bucket policy is not required to allow the role if the role already grants access. Option C is wrong because the IAM role is correctly associated with the instance. Option D is wrong because S3 does not require encryption for access.
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.
✓
The VPC endpoint policy for S3 does not allow the required action.
Why this is correct
VPC endpoint policies can override IAM permissions.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The EC2 instance does not have an encryption key to decrypt the objects.
Why it's wrong here
Access denied is not related to encryption keys.
✗
The S3 bucket policy does not explicitly allow the IAM role.
Why it's wrong here
Bucket policies are not required if the IAM role grants access.
✗
The IAM role is not attached to the EC2 instance profile.
Why it's wrong here
The role is attached; otherwise the application would not have any 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.
Identity and Access Management — This question tests Identity and Access Management — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The VPC endpoint policy for S3 does not allow the required action. — Option B is correct because a VPC endpoint policy can restrict access to specific buckets, and if it does not allow the target bucket, requests will be denied even if the IAM role allows it. Option A is wrong because the S3 bucket policy is not required to allow the role if the role already grants access. Option C is wrong because the IAM role is correctly associated with the instance. Option D is wrong because S3 does not require encryption for access.
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.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
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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