ANS-C01 Network Implementation Practice Question
A company has a VPC with public and private subnets. They have a web server in the public subnet that needs to make API calls to Amazon S3. The web server has a public IP. What is the MOST secure way to allow the web server to access S3 without traversing the internet?
⚠ Common exam trap
Many exam-takers confuse Gateway VPC Endpoints with Interface VPC Endpoints, assuming an interface is needed for all services, but S3 and DynamoDB exclusively use Gateway Endpoints for private connectivity without internet traversal.
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 Gateway VPC Endpoint for S3 and add a route in the public subnet's route table to S3 via the endpoint
A Gateway VPC Endpoint for S3 allows resources within a VPC to access S3 over the AWS private network without traversing the internet. By adding a route in the public subnet's route table pointing to the endpoint, the web server can reach S3 privately, even though it has a public IP. This is the most secure option because traffic stays within the AWS backbone and does not require an internet gateway, NAT, or proxy.
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 Gateway VPC Endpoint for S3 and add a route in the public subnet's route table to S3 via the endpoint
Why this is correct
Correct; Gateway Endpoint provides private access to S3 without internet.
- ✗
Place a forward proxy server in the public subnet and configure the web server to use it for S3
Why it's wrong here
Incorrect; this adds complexity and does not guarantee private access.
- ✗
Create an Interface VPC Endpoint for S3 in the public subnet
Why it's wrong here
Incorrect; Interface Endpoint is an option but not the most cost-effective; also it can be used but the question asks for most secure way.
- ✗
Set up a NAT Gateway in the same subnet and route S3 traffic through it
Why it's wrong here
Incorrect; NAT Gateway still uses the internet to reach S3.
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 |
Go deeper
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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.