- A
Create a Gateway VPC endpoint for the S3 service
S3 uses a Gateway VPC endpoint type. Gateway endpoints integrate with your VPC route tables so that traffic destined for S3 is routed privately within the VPC, avoiding the need for NAT Gateway and public internet egress for S3 access.
- B
Create an Interface VPC endpoint (powered by PrivateLink) for S3
Why wrong: Interface endpoints are used by many AWS services, but S3 is specifically accessed via a Gateway endpoint. Using an Interface endpoint for S3 would not provide the intended S3 connectivity pattern for private subnets in the standard AWS design.
- C
Use a Transit Gateway to route to S3 over the internet
Why wrong: A Transit Gateway routes traffic between networks/VPCs, but it does not replace the service-specific private connectivity required to reach S3 without public internet. You would still need an appropriate private path (such as a gateway endpoint) rather than sending traffic over the internet.
- D
Place a NAT Gateway and restrict security group egress to port 443 to reduce exposure
Why wrong: Adding a NAT Gateway directly violates the constraint of having no NAT Gateway. Security group egress restrictions cannot substitute for the required private S3 routing path.
Quick Answer
The answer is to create a Gateway VPC endpoint for the S3 service. This is correct because a Gateway endpoint uses prefix lists and route table entries to route S3 traffic through AWS’s internal network, allowing an EC2 instance in a private subnet with no NAT gateway to access S3 without traversing the public internet. On the SAA-C03 exam, this scenario tests your understanding of how to connect private resources to AWS services while avoiding internet gateways or NAT costs—a common trap is confusing Gateway endpoints with Interface endpoints, which require private IPs and incur hourly charges. Remember that Gateway endpoints are free, scale automatically, and only support S3 and DynamoDB, making them the ideal choice for private subnet access without NAT. A useful memory tip: think “Gateway for S3—no gateway fee, no public IP needed.”
SAA-C03 Design Secure Architectures Practice Question
This SAA-C03 practice question tests your understanding of design secure architectures. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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.
You have an EC2 instance in private subnets with no NAT Gateway. The instance must access an Amazon S3 bucket (for example, to read configuration files) without sending traffic to the public internet. What VPC endpoint type should you use 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
Create a Gateway VPC endpoint for the S3 service
A Gateway VPC endpoint is the correct choice because it allows EC2 instances in a private subnet to access S3 without traversing the public internet. It uses prefix lists and route table entries to direct S3 traffic through AWS's internal network, and it does not require a NAT gateway, internet gateway, or public IP addresses. Gateway endpoints are free of charge and scale automatically, making them ideal for private subnet access to S3 and DynamoDB.
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 a Gateway VPC endpoint for the S3 service
Why this is correct
S3 uses a Gateway VPC endpoint type. Gateway endpoints integrate with your VPC route tables so that traffic destined for S3 is routed privately within the VPC, avoiding the need for NAT Gateway and public internet egress for S3 access.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Create an Interface VPC endpoint (powered by PrivateLink) for S3
Why it's wrong here
Interface endpoints are used by many AWS services, but S3 is specifically accessed via a Gateway endpoint. Using an Interface endpoint for S3 would not provide the intended S3 connectivity pattern for private subnets in the standard AWS design.
- ✗
Use a Transit Gateway to route to S3 over the internet
Why it's wrong here
A Transit Gateway routes traffic between networks/VPCs, but it does not replace the service-specific private connectivity required to reach S3 without public internet. You would still need an appropriate private path (such as a gateway endpoint) rather than sending traffic over the internet.
- ✗
Place a NAT Gateway and restrict security group egress to port 443 to reduce exposure
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse Gateway VPC endpoints with Interface VPC endpoints, assuming S3 requires a private IP address like other AWS services, but S3 and DynamoDB are the only services that support Gateway endpoints, which are simpler and free.
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, which uses AWS's private network to route traffic. Unlike Interface endpoints, Gateway endpoints do not use ENIs or private IP addresses; instead, they rely on route table entries and are highly available by default across all Availability Zones in the region. A real-world scenario is a CI/CD pipeline where EC2 instances in private subnets fetch artifacts from S3 without needing a NAT Gateway, reducing both cost and attack surface.
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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
What to study next
Got this wrong? Here's your next step.
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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 the S3 service — A Gateway VPC endpoint is the correct choice because it allows EC2 instances in a private subnet to access S3 without traversing the public internet. It uses prefix lists and route table entries to direct S3 traffic through AWS's internal network, and it does not require a NAT gateway, internet gateway, or public IP addresses. Gateway endpoints are free of charge and scale automatically, making them ideal for private subnet access to S3 and DynamoDB.
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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