- A
Create an Interface VPC endpoint for S3 and point the instances to it
Why wrong: Interface VPC endpoints (powered by AWS PrivateLink) use elastic network interfaces (ENIs) in your subnets and are supported for many services, but Amazon S3 is a special case. For S3, the supported private connectivity model is a Gateway VPC endpoint that integrates with route tables, not an interface endpoint.
- B
Create a Gateway VPC endpoint for S3 and update the route tables to use it
Gateway VPC endpoints for S3 are the supported way to send S3 traffic from private subnets without NAT. They add routes in the relevant route tables (via S3 prefix lists) so requests to S3 go through the AWS network. This avoids internet egress and keeps the path private to the extent intended by VPC endpoint routing.
- C
Create a NAT gateway and allow outbound HTTPS to S3
Why wrong: A NAT gateway provides outbound internet connectivity. Even if the destination is S3 over HTTPS, traffic still traverses the NAT gateway and leaves the VPC via the internet path, which violates the requirement to avoid NAT/internet egress.
- D
Create a VPC endpoint service and manually register S3 as a provider endpoint
Why wrong: VPC Endpoint Services are for exposing your own services privately (or consuming privately exposed endpoint services). S3 is not registered as a provider endpoint service by customers. The correct AWS-managed approach for S3 is a Gateway VPC endpoint.
Quick Answer
The answer is to create a Gateway VPC endpoint for S3 and update the route tables to use it. This is correct because a Gateway endpoint uses prefix lists and route table entries to route S3 traffic directly through the AWS private backbone, keeping all traffic within AWS networking without any internet egress or need for a NAT gateway. On the SAA-C03 exam, this question tests your understanding of VPC endpoint types and their specific use cases; the common trap is choosing an Interface endpoint, which incurs hourly charges and is better for services like API Gateway or PrivateLink, whereas Gateway endpoints are free and only support S3 and DynamoDB. Remember the memory tip: “Gateway for S3 and DynamoDB—no hourly fee, just route table entries.”
SAA-C03 Design Secure Architectures Practice Question
This SAA-C03 practice question tests your understanding of design secure architectures. 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 runs EC2 instances in private subnets and needs to access Amazon S3 objects without using a NAT gateway. They want the traffic to stay within AWS private networking as much as possible (no internet egress). Which VPC endpoint type should they create for Amazon 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
Create a Gateway VPC endpoint for S3 and update the route tables to use it
A Gateway VPC endpoint for S3 is the correct choice because it uses prefix lists and route table entries to send S3 traffic directly through AWS's private network without leaving the AWS backbone or requiring a NAT gateway. This endpoint type supports S3 and DynamoDB only, and it does not incur hourly charges, making it cost-effective for private subnet instances to access S3 objects securely.
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.
- ✗
Create an Interface VPC endpoint for S3 and point the instances to it
Why it's wrong here
Interface VPC endpoints (powered by AWS PrivateLink) use elastic network interfaces (ENIs) in your subnets and are supported for many services, but Amazon S3 is a special case. For S3, the supported private connectivity model is a Gateway VPC endpoint that integrates with route tables, not an interface endpoint.
- ✓
Create a Gateway VPC endpoint for S3 and update the route tables to use it
Why this is correct
Gateway VPC endpoints for S3 are the supported way to send S3 traffic from private subnets without NAT. They add routes in the relevant route tables (via S3 prefix lists) so requests to S3 go through the AWS network. This avoids internet egress and keeps the path private to the extent intended by VPC endpoint routing.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Create a NAT gateway and allow outbound HTTPS to S3
- ✗
Create a VPC endpoint service and manually register S3 as a provider endpoint
Why it's wrong here
VPC Endpoint Services are for exposing your own services privately (or consuming privately exposed endpoint services). S3 is not registered as a provider endpoint service by customers. The correct AWS-managed approach for S3 is a Gateway VPC endpoint.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse Gateway endpoints (for S3/DynamoDB) with Interface endpoints (for other AWS services), or incorrectly assume that a NAT gateway is required for private subnet egress, missing that Gateway endpoints provide a free, private alternative for S3 access.
Detailed technical explanation
How to think about this question
Gateway VPC endpoints work by adding a route in the VPC route table that points the S3 prefix list (e.g., com.amazonaws.us-east-1.s3) to the endpoint ID, enabling traffic to traverse the AWS global network without internet exposure. Unlike Interface endpoints, Gateway endpoints do not use DNS resolution changes or ENIs; they rely on the source IP of the instance remaining private, which is critical for compliance scenarios like HIPAA or FedRAMP where data must not transit the public internet.
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.
What to study next
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FAQ
Questions learners often ask
What does this SAA-C03 question test?
Design Secure Architectures — This question tests Design Secure Architectures — 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 and update the route tables to use it — A Gateway VPC endpoint for S3 is the correct choice because it uses prefix lists and route table entries to send S3 traffic directly through AWS's private network without leaving the AWS backbone or requiring a NAT gateway. This endpoint type supports S3 and DynamoDB only, and it does not incur hourly charges, making it cost-effective for private subnet instances to access S3 objects securely.
What should I do if I get this SAA-C03 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
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