- A
Use an Interface VPC Endpoint for S3
Why wrong: Interface endpoints are for services like API Gateway, not S3.
- B
Use AWS Direct Connect
Why wrong: Direct Connect is for on-premises connectivity, not needed for VPC to S3.
- C
Set up a NAT Gateway in the public subnet and route traffic through it
Why wrong: NAT Gateway uses internet and incurs data transfer costs.
- D
Create a Gateway VPC Endpoint for S3
Gateway endpoint provides private, low-cost access to S3.
Question 1,520 of 1,705
VPC Gateway Endpoint for Private S3 Access
This ANS-C01 practice question tests your understanding of network implementation. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
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. The company wants to minimize data transfer costs and avoid traversing the internet. Which solution should be implemented?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"minimum / minimize"Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
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
A Gateway VPC Endpoint for S3 allows EC2 instances in a private subnet to access S3 without traversing the internet, using AWS's internal network. This minimizes data transfer costs because Gateway Endpoints are free and traffic stays within the AWS backbone, avoiding NAT Gateway or internet gateway charges.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Use an Interface VPC Endpoint for S3
Why it's wrong here
Interface endpoints are for services like API Gateway, not S3.
- ✗
Use AWS Direct Connect
Why it's wrong here
Direct Connect is for on-premises connectivity, not needed for VPC to S3.
- ✗
Set up a NAT Gateway in the public subnet and route traffic through it
- ✓
Create a Gateway VPC Endpoint for S3
Why this is correct
Gateway endpoint provides private, low-cost access to S3.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The ANS-C01 exam often tests the distinction between Gateway and Interface VPC Endpoints, trapping candidates who assume all endpoints are Interface-based or that NAT Gateway is the only way to access AWS services from private subnets.
Detailed technical explanation
How to think about this question
Gateway VPC Endpoints use route table entries to direct S3 traffic through AWS's private network, leveraging the S3 service's prefix list. Unlike Interface Endpoints (powered by AWS PrivateLink), Gateway Endpoints do not use ENIs or require security group rules; instead, they rely on route table propagation and bucket policies for access control. In real-world scenarios, this is ideal for large-scale data transfers like log backups or ML training datasets, where cost savings from avoiding NAT Gateway charges are significant.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.
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 |
What to study next
Got this wrong? Here's your next step.
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FAQ
Questions learners often ask
What does this ANS-C01 question test?
Network Implementation — This question tests Network Implementation — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Create a Gateway VPC Endpoint for S3 — A Gateway VPC Endpoint for S3 allows EC2 instances in a private subnet to access S3 without traversing the internet, using AWS's internal network. This minimizes data transfer costs because Gateway Endpoints are free and traffic stays within the AWS backbone, avoiding NAT Gateway or internet gateway charges.
What should I do if I get this ANS-C01 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "minimum / minimize". Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Same concept, more angles
3 more ways this is tested on ANS-C01
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. 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?
medium- A.Create a VPC Interface Endpoint for S3 and attach it to the private subnet.
- B.Configure an S3 bucket policy to allow access from the VPC and use an Internet Gateway.
- ✓ C.Create a VPC Gateway Endpoint for S3 and attach it to the private subnet's route table.
- D.Create a NAT Gateway in the public subnet and route traffic to the S3 bucket through it.
Why C: Option C is correct because 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.
Variation 2. A company has a VPC with a public subnet and a private subnet. An EC2 instance in the private subnet needs to access an S3 bucket. The company wants to ensure that traffic to S3 does not traverse the internet. Which solution should a network engineer implement?
medium- A.Create a VPC interface endpoint for S3 and attach it to the private subnet.
- B.Deploy an S3 VPN endpoint in the VPC.
- ✓ C.Create a VPC gateway endpoint for S3 and add a route to the S3 prefix list via the endpoint.
- D.Set up a NAT gateway in the public subnet and add a route to the S3 prefix list via the NAT gateway.
Why C: Option C is correct because a VPC gateway endpoint for S3 allows instances in a private subnet to access S3 privately using AWS's internal network, without traversing the internet. By adding a route to the S3 prefix list via the gateway endpoint, traffic destined for S3 is directed through the endpoint, which uses AWS's private backbone. This solution is cost-effective and does not require a NAT gateway or internet gateway.
Variation 3. A company has a VPC with public and private subnets. An EC2 instance in a private subnet needs to access an S3 bucket in the same Region. Which solution provides the most secure and cost-effective connectivity?
medium- A.Create a NAT gateway in a public subnet and add a route in the private subnet's route table pointing to the NAT gateway.
- B.Create an interface endpoint for S3 in the private subnet.
- C.Attach an internet gateway to the VPC and add a route to the internet gateway in the private subnet's route table.
- ✓ D.Create a gateway endpoint for S3 in the VPC and add a route in the private subnet's route table pointing to the endpoint.
Why D: A gateway endpoint for S3 uses Amazon's private network to connect the VPC to S3 without traversing the internet, providing the most secure and cost-effective solution. It avoids NAT gateway hourly charges and data processing fees, and it does not require public IPs or internet access for the private subnet EC2 instance.
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Last reviewed: Jul 4, 2026
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