ANS-C01 Network Implementation Practice Question
A network engineer needs to allow an EC2 instance in a private subnet to access an S3 bucket without traversing the internet. Which AWS service should be used?
⚠ Common exam trap
Many candidates confuse Gateway Endpoints with Interface Endpoints (for services like DynamoDB or API Gateway) or assume a NAT Gateway is needed for private subnet outbound traffic, missing the specific requirement to avoid internet transit for S3.
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
✓
VPC Gateway Endpoint
A VPC Gateway Endpoint allows private subnet resources to access S3 without traversing the internet by routing traffic through AWS's internal network. It uses prefix lists and route table entries to direct S3-bound traffic to a highly available, horizontally scaled gateway endpoint, avoiding NAT or internet gateway costs and latency.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
VPC Peering
Why it's wrong here
VPC Peering does not provide access to S3.
- ✓
VPC Gateway Endpoint
Why this is correct
Gateway Endpoint allows private access to S3.
- ✗
Internet Gateway
Why it's wrong here
Internet Gateway exposes the instance to the internet.
- ✗
NAT Gateway
Why it's wrong here
NAT Gateway routes traffic through the internet, not fully private.
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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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.