- A
Place instances in private subnets but use NAT gateways so traffic to S3 and Secrets Manager goes through the internet; restrict security groups to instance-to-instance only.
Why wrong: NAT still routes traffic through the internet path and contradicts the cost and private-connectivity requirement. Restricting instance-to-instance rules does not prevent public service access through NAT.
- B
Add a VPC gateway endpoint for S3 and an interface VPC endpoint for Secrets Manager; keep instances in private subnets and configure security group rules attached to the endpoints to allow inbound traffic only from the application subnets.
Gateway endpoints provide private routing to S3, and interface endpoints provide private access to Secrets Manager without internet traversal. Security group controls on interface endpoints restrict traffic to only the application subnets, meeting segmentation and cost constraints.
- C
Use public subnets with instances that have no security group rules; rely on AWS services to reject unauthorized traffic.
Why wrong: Public subnets plus missing security controls violates baseline security. Relying on AWS service rejection does not provide explicit network segmentation or deterministic access control.
- D
Create an S3 bucket policy that allows requests from the application instances’ private IP addresses and enable public access to Secrets Manager via the default service endpoint.
Why wrong: Bucket policy cannot safely replace network-level private connectivity. Secrets Manager still requires private endpoint configuration or NAT/IGW routing for private subnets; public access contradicts requirements.
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. A key principle to apply: vPC gateway endpoints provide private access to S3 and DynamoDB.. 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 an application in private subnets (no inbound internet). The application must access Amazon S3 and AWS Secrets Manager endpoints without routing through the public internet and without exposing the instances to NAT gateways due to cost. Security requirements also state that only the required VPC traffic should be allowed to reach AWS services.
Which architecture best satisfies these requirements?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"best"Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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
Add a VPC gateway endpoint for S3 and an interface VPC endpoint for Secrets Manager; keep instances in private subnets and configure security group rules attached to the endpoints to allow inbound traffic only from the application subnets.
Option B is correct because it uses a VPC gateway endpoint for Amazon S3 and an interface VPC endpoint for AWS Secrets Manager, both of which allow private subnet instances to access these services without traversing the public internet or requiring a NAT gateway. The security group rules attached to the interface endpoint restrict inbound traffic to only the application subnets, satisfying the security requirement of allowing only required VPC traffic. This architecture meets all constraints: no public internet, no NAT gateway cost, and least-privilege access.
Key principle: VPC gateway endpoints provide private access to S3 and DynamoDB.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Place instances in private subnets but use NAT gateways so traffic to S3 and Secrets Manager goes through the internet; restrict security groups to instance-to-instance only.
Why it's wrong here
NAT still routes traffic through the internet path and contradicts the cost and private-connectivity requirement. Restricting instance-to-instance rules does not prevent public service access through NAT.
- ✓
Add a VPC gateway endpoint for S3 and an interface VPC endpoint for Secrets Manager; keep instances in private subnets and configure security group rules attached to the endpoints to allow inbound traffic only from the application subnets.
Why this is correct
Gateway endpoints provide private routing to S3, and interface endpoints provide private access to Secrets Manager without internet traversal. Security group controls on interface endpoints restrict traffic to only the application subnets, meeting segmentation and cost constraints.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
VPC gateway endpoints provide private access to S3 and DynamoDB.
- ✗
Use public subnets with instances that have no security group rules; rely on AWS services to reject unauthorized traffic.
Why it's wrong here
Public subnets plus missing security controls violates baseline security. Relying on AWS service rejection does not provide explicit network segmentation or deterministic access control.
- ✗
Create an S3 bucket policy that allows requests from the application instances’ private IP addresses and enable public access to Secrets Manager via the default service endpoint.
Why it's wrong here
Bucket policy cannot safely replace network-level private connectivity. Secrets Manager still requires private endpoint configuration or NAT/IGW routing for private subnets; public access contradicts requirements.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume all AWS services require NAT gateways or internet gateways for private subnet access, overlooking the distinction between gateway endpoints (for S3 and DynamoDB) and interface endpoints (for most other services like Secrets Manager) that provide private connectivity without internet exposure.
Detailed technical explanation
How to think about this question
A VPC gateway endpoint for S3 uses prefix lists and route table entries to direct S3 traffic over the AWS network backbone without leaving the VPC, while an interface endpoint for Secrets Manager uses an Elastic Network Interface (ENI) with a private IP in the subnet, powered by AWS PrivateLink. Security groups attached to interface endpoints evaluate inbound traffic at the endpoint level, allowing fine-grained control based on source IP or security group, whereas gateway endpoints rely on bucket policies and VPC endpoint policies for access control. In practice, this architecture is commonly used in regulated environments like healthcare or finance to meet compliance requirements such as HIPAA or PCI DSS.
KKey Concepts to Remember
- VPC gateway endpoints provide private access to S3 and DynamoDB.
- VPC interface endpoints (PrivateLink) provide private access to most other AWS services.
- Interface endpoints use ENIs with associated security groups for access control.
- Neither gateway nor interface endpoints route traffic through the public internet.
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
VPC gateway endpoints provide private access to S3 and DynamoDB.
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 — VPC gateway endpoints provide private access to S3 and DynamoDB..
What is the correct answer to this question?
The correct answer is: Add a VPC gateway endpoint for S3 and an interface VPC endpoint for Secrets Manager; keep instances in private subnets and configure security group rules attached to the endpoints to allow inbound traffic only from the application subnets. — Option B is correct because it uses a VPC gateway endpoint for Amazon S3 and an interface VPC endpoint for AWS Secrets Manager, both of which allow private subnet instances to access these services without traversing the public internet or requiring a NAT gateway. The security group rules attached to the interface endpoint restrict inbound traffic to only the application subnets, satisfying the security requirement of allowing only required VPC traffic. This architecture meets all constraints: no public internet, no NAT gateway cost, and least-privilege access.
What should I do if I get this SAA-C03 question wrong?
Review vPC gateway endpoints provide private access to S3 and DynamoDB., then practise related SAA-C03 questions on the same topic to reinforce the concept.
Are there clue words in this question I should notice?
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
VPC gateway endpoints provide private access to S3 and DynamoDB.
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Last reviewed: Jun 11, 2026
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