This ANS-C01 practice question tests your understanding of network security, compliance and governance. 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 wants to restrict access to an S3 bucket so that only requests from a specific VPC are allowed. The bucket policy should deny requests that do not originate from the VPC. Which condition key should be used in the bucket policy?
aws:SourceVpc
This condition key restricts access to a specific VPC.
aws:VpcSourceIp
Why wrong: This condition key does not exist.
aws:Referer
Why wrong: This is for HTTP referer headers.
aws:SourceIp
Why wrong: This is for IP addresses, not VPCs.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
aws:SourceVpc
The correct condition key is `aws:SourceVpc`, which allows you to restrict access to an S3 bucket based on the VPC from which the request originates. When used in a bucket policy with a Deny effect, it ensures that only requests coming from the specified VPC ID are allowed, and all other requests are denied. This key is specifically designed for VPC-based access control in 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.
aws:SourceVpc
Why this is correct
This condition key restricts access to a specific VPC.
Related concept
Read the scenario before looking for a memorised answer.
aws:VpcSourceIp
Why it's wrong here
This condition key does not exist.
aws:Referer
Why it's wrong here
This is for HTTP referer headers.
aws:SourceIp
Why it's wrong here
This is for IP addresses, not VPCs.
Common exam traps
AWS often tests the distinction between `aws:SourceVpc` and `aws:SourceIp` — the trap here is that candidates mistakenly choose `aws:SourceIp` thinking they can restrict by VPC by using the VPC's CIDR range, but this fails because requests from within the VPC may have different source IPs (e.g., private IPs or NAT public IPs) and cannot reliably identify the VPC.
Detailed technical explanation
The `aws:SourceVpc` condition key works by checking the VPC ID from which the request was made, which is available in the request context when the request comes from an S3 VPC endpoint (either Gateway or Interface endpoint). This is particularly useful in hybrid architectures where you want to allow access only from resources within a specific VPC, such as EC2 instances or Lambda functions, while blocking all external access including from other VPCs or the public internet. A common real-world scenario is when you have a VPC with an S3 Gateway Endpoint and you want to ensure that only traffic routed through that endpoint (and thus staying within the AWS network) can access the bucket, preventing data exfiltration via the public internet.
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 exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Network Security, Compliance and Governance — study guide chapter
Learn the concepts, then practise the questions
Network Security, Compliance and Governance practice questions
Targeted practice on this topic area only
All ANS-C01 questions
1,705 questions across all exam domains
AWS Certified Advanced Networking Specialty ANS-C01 study guide
Full concept coverage aligned to exam objectives
ANS-C01 practice test guide
How to use practice tests most effectively before exam day
Related practice questions
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
Practise ANS-C01 questions linked to Network Management and Operations.
Practise ANS-C01 questions linked to Network Security, Compliance and Governance.
Practise ANS-C01 questions linked to Network Design.
Practise ANS-C01 questions linked to Network Implementation.
Practise ANS-C01 questions linked to ANS-C01 fundamentals.
Practise ANS-C01 questions linked to ANS-C01 scenario.
Practise ANS-C01 questions linked to ANS-C01 troubleshooting.
Practice this exam
Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.
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: aws:SourceVpc — The correct condition key is `aws:SourceVpc`, which allows you to restrict access to an S3 bucket based on the VPC from which the request originates. When used in a bucket policy with a Deny effect, it ensures that only requests coming from the specified VPC ID are allowed, and all other requests are denied. This key is specifically designed for VPC-based access control in S3 bucket policies.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Last reviewed: Jun 30, 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.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.