ANS-C01 Network Implementation Practice Question
A company has a VPC with a public subnet and a private subnet. An EC2 instance in the private subnet needs to download patches from an S3 bucket in the same region. The company wants to minimize data transfer costs and avoid traversing the internet. Which solution should the company implement?
⚠ Common exam trap
Many candidates confuse Gateway Endpoints with Interface Endpoints, assuming Interface Endpoints are always the better choice for private connectivity, but for S3 and DynamoDB, Gateway Endpoints are the cost-optimized solution that avoids data transfer charges.
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 it to the private subnet's route table.
A VPC Gateway Endpoint for S3 provides private, cost-free connectivity to S3 from within a VPC without traversing the internet. It uses prefix-based routing via the route table, ensuring traffic to S3 stays within the AWS network, minimizing data transfer costs and avoiding internet egress charges.
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 Interface Endpoint for S3 and attach it to the private subnet.
Why it's wrong here
Interface Endpoint incurs hourly charges and data processing fees.
- ✗
Configure an S3 bucket policy to allow access from the VPC and use an Internet Gateway.
Why it's wrong here
This would still require internet route and does not minimize cost.
- ✓
Create a VPC Gateway Endpoint for S3 and attach it to the private subnet's route table.
Why this is correct
Gateway Endpoint is free and provides private connectivity to S3.
- ✗
Create a NAT Gateway in the public subnet and route traffic to the S3 bucket through it.
Why it's wrong here
NAT Gateway incurs charges and uses internet, not minimizing cost.
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.