- A
The IAM role does not have permissions for the second instance.
Why wrong: Same role, same permissions.
- B
The bucket policy condition on aws:sourceVpce does not match requests from the peered VPC.
Requests from peered VPC do not use the endpoint.
- C
The VPC endpoint is not accessible from the peered VPC.
Why wrong: VPC endpoints are not inherently accessible across peering.
- D
The transit gateway does not support S3 traffic.
Why wrong: Transit gateway can route S3 traffic.
Question 1,060 of 1,748
SCS-C02 aws:sourceVpce Practice Question
This SCS-C02 practice question tests your understanding of identity and access management. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. A key principle to apply: aws:sourceVpce. 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 has an S3 bucket that stores sensitive data. The bucket policy allows access only from a specific VPC endpoint. A security engineer notices that an EC2 instance in the same VPC can access the bucket, but an instance in a peered VPC cannot. Both instances have the same IAM role attached. The VPC endpoint is in the first VPC and is shared via a transit gateway. What is the MOST likely reason the second instance cannot access the bucket?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"first"Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
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 choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The bucket policy condition on aws:sourceVpce does not match requests from the peered VPC.
The bucket policy condition 'aws:sourceVpce' checks for the VPC endpoint ID. Requests from the peered VPC do not traverse the VPC endpoint; they go through the transit gateway. Therefore, the condition fails, and the bucket denies access. Option A is incorrect because the IAM role is the same for both instances. Option C is incorrect because the VPC endpoint is accessible from the peered VPC via the transit gateway, but the condition is not met. Option D is incorrect because the transit gateway does support S3 traffic.
Key principle: aws:sourceVpce
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 IAM role does not have permissions for the second instance.
Why it's wrong here
Same role, same permissions.
- ✓
The bucket policy condition on aws:sourceVpce does not match requests from the peered VPC.
Why this is correct
Requests from peered VPC do not use the endpoint.
Clue confirmation
The clue words "first", "most likely" in the question point toward this answer.
Related concept
aws:sourceVpce
- ✗
The VPC endpoint is not accessible from the peered VPC.
Why it's wrong here
VPC endpoints are not inherently accessible across peering.
- ✗
The transit gateway does not support S3 traffic.
Why it's wrong here
Transit gateway can route S3 traffic.
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
Treat this as a scenario question. Identify the problem, the constraint, and the best action. Then compare each option against those facts.
KKey Concepts to Remember
- aws:sourceVpce
- VPC endpoint
- Transit gateway
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
aws:sourceVpce
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.
Quick reference
AWS S3 Storage Class Comparison
| Storage Class | Min Duration | Retrieval | Use Case |
|---|---|---|---|
| S3 Standard | None | Immediate | Frequently accessed data |
| S3 Standard-IA | 30 days | Immediate | Infrequent access, rapid retrieval |
| S3 One Zone-IA | 30 days | Immediate | Non-critical infrequent data |
| S3 Intelligent-Tiering | None | Immediate–hours | Unknown or changing access patterns |
| S3 Glacier Instant | 90 days | Milliseconds | Archive with instant retrieval |
| S3 Glacier Flexible | 90 days | Minutes–hours | Archive, flexible retrieval |
| S3 Glacier Deep Archive | 180 days | Hours | Long-term compliance archive |
What to study next
Got this wrong? Here's your next step.
Review aws:sourceVpce, then practise related SCS-C02 questions on the same topic to reinforce the concept.
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Identity and Access Management — study guide chapter
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Identity and Access Management practice questions
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FAQ
Questions learners often ask
What does this SCS-C02 question test?
Identity and Access Management — This question tests Identity and Access Management — aws:sourceVpce.
What is the correct answer to this question?
The correct answer is: The bucket policy condition on aws:sourceVpce does not match requests from the peered VPC. — The bucket policy condition 'aws:sourceVpce' checks for the VPC endpoint ID. Requests from the peered VPC do not traverse the VPC endpoint; they go through the transit gateway. Therefore, the condition fails, and the bucket denies access. Option A is incorrect because the IAM role is the same for both instances. Option C is incorrect because the VPC endpoint is accessible from the peered VPC via the transit gateway, but the condition is not met. Option D is incorrect because the transit gateway does support S3 traffic.
What should I do if I get this SCS-C02 question wrong?
Review aws:sourceVpce, then practise related SCS-C02 questions on the same topic to reinforce the concept.
Are there clue words in this question I should notice?
Yes — watch for: "first", "most likely". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
What is the key concept behind this question?
aws:sourceVpce
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Last reviewed: Jun 20, 2026
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