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 TWO actions should be taken? (Choose two.)
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
✓
Create an S3 bucket policy with a condition that allows access only from the VPC endpoint.
An S3 bucket policy can use the aws:SourceVpce condition key to allow access only from a specific VPC endpoint, restricting requests to those originating from that endpoint. Option C is correct because a VPC endpoint policy controls what actions principals within the VPC can perform on the S3 bucket, providing an additional layer of access control. Option A is incorrect because security groups are not supported for gateway VPC endpoints (which are used for S3); they cannot be assigned to such endpoints. Option D is incorrect because network ACLs operate at the subnet level and cannot enforce restrictions based on the source VPC or VPC endpoint; they control traffic entering/exiting subnets but do not apply to S3 bucket access directly. Option E is incorrect because IAM roles grant permissions to identities (users or services) but do not restrict traffic origin; they do not limit access to traffic from a specific VPC.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Assign a security group to the VPC endpoint that allows inbound traffic from the VPC.
Why it's wrong here
Wrong: Security groups are not supported for VPC endpoints; they are for instances.
- ✓
Create an S3 bucket policy with a condition that allows access only from the VPC endpoint.
Why this is correct
Correct: S3 bucket policies can use aws:SourceVpce condition to restrict access.
- ✓
Attach a VPC endpoint policy that allows the desired actions on the S3 bucket.
Why this is correct
Correct: VPC endpoint policies control access to S3 from the VPC.
- ✗
Configure a network ACL on the subnet to deny all inbound traffic except from the VPC.
Why it's wrong here
Wrong: NACLs control subnet traffic but cannot restrict S3 bucket access.
- ✗
Use an IAM role to grant the VPC access to the S3 bucket.
Why it's wrong here
Wrong: IAM roles grant permissions to identities, not traffic origin restrictions.
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.