ANS-C01 Network Security, Compliance and Governance Practice Question
A company has a VPC with a public subnet and a private subnet. An EC2 instance in the private subnet needs to access an S3 bucket. The security team wants to ensure that traffic to S3 does not traverse the internet. Which solution meets this requirement?
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 a VPC gateway endpoint for S3 and attach an endpoint policy that restricts access to the specific bucket
A VPC gateway endpoint for S3 allows private subnet instances to access S3 without traversing the internet. Option B is wrong because a VPN connection is used to connect to on-premises networks, not to access S3 privately. Option C is wrong because a NAT gateway still routes traffic through the internet. Option D is wrong because a proxy server also introduces internet connectivity.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Create a VPC gateway endpoint for S3 and attach an endpoint policy that restricts access to the specific bucket
Why this is correct
Traffic stays within AWS network.
- ✗
Establish a VPN connection to the on-premises network and route through it
Why it's wrong here
Does not help with S3 access.
- ✗
Set up a NAT gateway in the public subnet and route private subnet traffic to it
Why it's wrong here
Traffic goes through NAT to internet.
- ✗
Deploy a proxy server in the public subnet and configure the instance to use it
Why it's wrong here
Proxy server uses internet.
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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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.