ANS-C01 Network Security, Compliance and Governance Practice Question
A company wants to restrict access to an S3 bucket so that only traffic from a specific VPC can read objects. Which policy type should be used?
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
✓
Attach an S3 bucket policy with a condition for aws:SourceVpc
S3 bucket policies support condition keys like `aws:SourceVpc` to restrict access to traffic originating from a specific VPC. Option D is correct because attaching a bucket policy with this condition directly limits access to the desired VPC. Option A is incorrect because a VPC endpoint policy controls actions allowed via the endpoint, but does not replace the need for a bucket policy. Option B is incorrect because network ACLs operate at the subnet level and cannot enforce S3 access restrictions. Option C is incorrect because while S3 access points can have policies, they are not the primary method for restricting access by VPC; a bucket policy with the `aws:SourceVpc` condition is the appropriate approach.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Configure a VPC endpoint policy
Why it's wrong here
VPC endpoint policies control access from the endpoint but not directly at the bucket level.
- ✗
Configure a network ACL to block all traffic except from the VPC CIDR
Why it's wrong here
Network ACLs operate at the subnet level and do not affect S3 access directly.
- ✗
Use an S3 access point with a network origin condition
Why it's wrong here
Access points add another layer but a bucket policy is the primary method.
- ✓
Attach an S3 bucket policy with a condition for aws:SourceVpc
Why this is correct
Bucket policies with aws:SourceVpc condition restrict access to traffic originating from the specified VPC.
Visual reference
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 |
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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.