ANS-C01 Network Implementation Practice Question
A company has a VPC with multiple subnets. An EC2 instance in a private subnet needs to access an S3 bucket. Which AWS service should be used to allow this access without traversing the internet?
⚠ Common exam trap
Test-takers frequently confuse VPC Gateway Endpoints with VPC Interface Endpoints (powered by PrivateLink) or assume a NAT gateway is required for any outbound traffic, not realizing that S3 and DynamoDB support Gateway Endpoints for direct private access.
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 for S3
A VPC Gateway Endpoint for S3 allows EC2 instances in a private subnet to access S3 buckets without traversing the internet by using AWS's internal network. It uses prefix lists and route table entries to direct S3 traffic through the endpoint, which is horizontally scaled and highly available. This avoids the need for a NAT gateway or internet gateway, keeping traffic within the AWS backbone.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Transit Gateway
Why it's wrong here
TGW is for network connectivity between VPCs and on-premises.
- ✗
NAT gateway
Why it's wrong here
NAT gateway provides internet access.
- ✓
VPC Gateway Endpoint for S3
Why this is correct
Gateway Endpoint allows private access to S3.
- ✗
Internet gateway
Why it's wrong here
IGW provides internet access.
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.