- A
An interface VPC endpoint for AWS STS so the job can call AssumeRole without internet access.
The application explicitly calls STS AssumeRole, so it needs private network access to the STS service. An interface endpoint provides that path inside the VPC without requiring a NAT Gateway or public internet route.
- B
An interface VPC endpoint for AWS Secrets Manager so the job can retrieve the secret privately.
Secrets Manager is reached through an interface endpoint when instances are isolated from the internet. Without that endpoint, the SDK cannot call GetSecretValue privately after the NAT Gateway is removed.
- C
A gateway VPC endpoint for Amazon S3 so the job can reach the secret store indirectly.
Why wrong: S3 endpoints are useful for bucket access, but Secrets Manager is not stored in S3 and STS does not use a gateway endpoint. This option does not address the services that are actually failing.
- D
A NAT Gateway in each Availability Zone so the job can use the public service endpoints.
Why wrong: A NAT Gateway would restore internet egress, but the requirement is to keep the subnets isolated and avoid that dependency. Interface endpoints are the correct private-connectivity solution here.
- E
An internet gateway attached to the VPC so private subnets can reach AWS APIs.
Why wrong: An internet gateway does not by itself let isolated private subnets reach public endpoints. It would also violate the design goal of avoiding internet exposure for the workload.
Quick Answer
The answer is an interface VPC endpoint for AWS STS and an interface VPC endpoint for AWS Secrets Manager. This is correct because EC2 instances in isolated private subnets with no NAT Gateway or Internet Gateway cannot reach public AWS service endpoints; interface VPC endpoints use AWS PrivateLink to provide private, routable connectivity within the VPC. The batch job’s AssumeRole call targets the STS API, and the secret retrieval targets the Secrets Manager API, so both services require their own dedicated endpoint. On the SAA-C03 exam, this scenario tests your understanding of how to enable private access to AWS APIs without internet egress, often appearing as a trap where candidates mistakenly choose a Gateway Endpoint for STS or Secrets Manager—but only S3 and DynamoDB use Gateway Endpoints, while STS and Secrets Manager require Interface Endpoints. A helpful memory tip: “If it’s not S3 or DynamoDB, use a PrivateLink interface.”
SAA-C03 Design Secure Architectures Practice Question
This SAA-C03 practice question tests your understanding of design secure architectures. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 batch job runs on EC2 instances in isolated private subnets with no NAT Gateway. The job uses STS AssumeRole to access an operations account and then retrieves a secret from AWS Secrets Manager. After a network hardening change, both calls fail. Which two interface VPC endpoints should be created? Select two.
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
An interface VPC endpoint for AWS STS so the job can call AssumeRole without internet access.
Option A is correct because the batch job uses STS AssumeRole, which requires calling the AWS STS API. Without a NAT Gateway or Internet Gateway, private subnets cannot reach public endpoints. An interface VPC endpoint for STS allows the EC2 instances to call AssumeRole privately using AWS PrivateLink, without needing internet access.
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.
- ✓
An interface VPC endpoint for AWS STS so the job can call AssumeRole without internet access.
Why this is correct
The application explicitly calls STS AssumeRole, so it needs private network access to the STS service. An interface endpoint provides that path inside the VPC without requiring a NAT Gateway or public internet route.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
An interface VPC endpoint for AWS Secrets Manager so the job can retrieve the secret privately.
- ✗
A gateway VPC endpoint for Amazon S3 so the job can reach the secret store indirectly.
Why it's wrong here
S3 endpoints are useful for bucket access, but Secrets Manager is not stored in S3 and STS does not use a gateway endpoint. This option does not address the services that are actually failing.
- ✗
A NAT Gateway in each Availability Zone so the job can use the public service endpoints.
- ✗
An internet gateway attached to the VPC so private subnets can reach AWS APIs.
Why it's wrong here
An internet gateway does not by itself let isolated private subnets reach public endpoints. It would also violate the design goal of avoiding internet exposure for the workload.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse gateway VPC endpoints (for S3 and DynamoDB) with interface VPC endpoints (for most other AWS services like STS and Secrets Manager), leading them to select option C instead of understanding that Secrets Manager requires an interface endpoint.
Detailed technical explanation
How to think about this question
Interface VPC endpoints use AWS PrivateLink to create an elastic network interface (ENI) in the subnet with a private IP address, allowing traffic to AWS services to stay within the AWS network. For STS, the endpoint must be created in the same region and VPC, and the security group must allow outbound HTTPS (port 443) to the endpoint's private IP. Secrets Manager similarly requires an interface endpoint; note that Secrets Manager does not support gateway endpoints, as it is a regional service accessed via API calls, not S3-style bucket policies.
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
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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: An interface VPC endpoint for AWS STS so the job can call AssumeRole without internet access. — Option A is correct because the batch job uses STS AssumeRole, which requires calling the AWS STS API. Without a NAT Gateway or Internet Gateway, private subnets cannot reach public endpoints. An interface VPC endpoint for STS allows the EC2 instances to call AssumeRole privately using AWS PrivateLink, without needing internet access.
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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