ANS-C01 Network Implementation Practice Question
A company is deploying a new application in a VPC with public and private subnets. The application needs to access an S3 bucket in the same AWS Region. Which configuration provides the MOST secure and cost-effective connectivity?
⚠ Common exam trap
The ANS-C01 exam often tests the misconception that a NAT gateway is required for private subnet internet access, but for AWS services like S3 and DynamoDB, gateway endpoints provide a more secure and cost-effective alternative without internet egress.
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 Gateway Endpoint in the VPC and add a route to it.
An S3 Gateway Endpoint allows private subnet resources to access S3 over the AWS network without traversing the internet, eliminating the need for a NAT gateway or proxy. This provides the most secure connectivity (no public exposure) and is cost-effective because there are no hourly or data processing charges for the endpoint itself, only standard S3 data transfer costs.
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 proxy server in the public subnet to forward requests to S3.
Why it's wrong here
Proxy adds management overhead and latency; not best practice.
- ✗
Set up an AWS Direct Connect connection to S3.
Why it's wrong here
Direct Connect is expensive and unnecessary for this use case.
- ✗
Create a NAT gateway in the public subnet and route traffic through it.
Why it's wrong here
NAT gateway incurs costs and uses internet; not most secure or cost-effective.
- ✓
Create an S3 Gateway Endpoint in the VPC and add a route to it.
Why this is correct
Gateway Endpoint provides private, free access to S3 within same Region.
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.