This ANS-C01 practice question tests your understanding of network security, compliance and governance. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 is using AWS CloudFormation to deploy a stack that includes an S3 bucket with a bucket policy that restricts access to a specific VPC endpoint. The stack fails to create, and the error indicates that the bucket policy contains an invalid principal. Which principal should be used to restrict access to a VPC endpoint?
The condition key aws:SourceVpce
The aws:SourceVpce condition key restricts access to requests originating from a specific VPC endpoint.
The VPC ID
Why wrong: The VPC ID is not a valid principal; it can be used in a condition key aws:SourceVpc.
The ARN of the VPC endpoint
Why wrong: The VPC endpoint ARN is not a valid principal in an S3 bucket policy.
The VPC endpoint service
Why wrong: The VPC endpoint service is not a valid principal.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
The condition key aws:SourceVpce
The condition key aws:SourceVpce allows restricting access to a specific VPC endpoint. Option A is wrong because a VPC endpoint has its own ARN, but it is not used as a principal. Option C is wrong because the VPC ID is not a principal. Option D is wrong because the VPC endpoint service is not a principal for S3 bucket policies.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
The condition key aws:SourceVpce
Why this is correct
The aws:SourceVpce condition key restricts access to requests originating from a specific VPC endpoint.
Related concept
Read the scenario before looking for a memorised answer.
The VPC ID
Why it's wrong here
The VPC ID is not a valid principal; it can be used in a condition key aws:SourceVpc.
The ARN of the VPC endpoint
Why it's wrong here
The VPC endpoint ARN is not a valid principal in an S3 bucket policy.
The VPC endpoint service
Why it's wrong here
The VPC endpoint service is not a valid principal.
Common exam traps
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
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.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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
Identify which ANS-C01 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.
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FAQ
Network Security, Compliance and Governance — This question tests Network Security, Compliance and Governance — Read the scenario before looking for a memorised answer..
The correct answer is: The condition key aws:SourceVpce — The condition key aws:SourceVpce allows restricting access to a specific VPC endpoint. Option A is wrong because a VPC endpoint has its own ARN, but it is not used as a principal. Option C is wrong because the VPC ID is not a principal. Option D is wrong because the VPC endpoint service is not a principal for S3 bucket policies.
Identify which ANS-C01 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.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 20, 2026
This ANS-C01 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 ANS-C01 exam.
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