ANS-C01 Network Security, Compliance and Governance Practice Question
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?
⚠ Common exam trap
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.
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
✓
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.
Answer analysis
Option-by-option breakdown
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.
- ✗
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.
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 |
Go deeper
Related to this question
About these practice questions
One of 1,621 original ANS-C01 practice questions on Courseiva, each with a full explanation and wrong-answer analysis — not exam dumps or protected exam content. Learn why practice questions differ from exam dumps →
JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.