ANS-C01 Network Security, Compliance and Governance Practice Question
A company has a VPC with public and private subnets. An application in the private subnet needs to access an S3 bucket. Which design meets security best practices without exposing the application to the internet?
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 update the route table
A VPC Gateway Endpoint for S3 allows private subnet resources to access S3 without internet exposure. Option B (NAT Gateway) would provide internet access but is unnecessary and could expose the application indirectly. Option C (VPN) is overkill and not needed for S3 access within AWS. Option D (Internet Gateway) would expose the application to the internet, violating security best practices.
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 update the route table
Why this is correct
Gateway Endpoint provides private access to S3.
- ✗
Use a NAT Gateway in the public subnet and route traffic through it
Why it's wrong here
NAT Gateway is for internet access, not required for S3.
- ✗
Set up a VPN connection to AWS and route through it
Why it's wrong here
VPN is not necessary for S3 access.
- ✗
Attach an Internet Gateway to the VPC and update route tables
Why it's wrong here
Internet gateway would expose the application to the 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.