- A
Create an S3 gateway VPC endpoint and update the route tables for the private subnets.
An S3 gateway endpoint provides private access to S3 without sending traffic over the internet. It is the correct endpoint type for S3 and integrates through route tables.
- B
Place a NAT gateway in the public subnet so the private instances can reach AWS services.
Why wrong: A NAT gateway sends outbound traffic to the internet and adds cost and exposure that the requirement explicitly forbids. It is not a private-only connectivity solution.
- C
Create an interface VPC endpoint for AWS Secrets Manager and allow the workload security group to reach it.
Secrets Manager uses an interface endpoint for private connectivity. This keeps API calls inside the AWS network and avoids the need for internet access or NAT.
- D
Assign public IPv4 addresses to the instances and restrict them with security groups.
Why wrong: Public IPs contradict the requirement to stay private and do not remove internet exposure. Security groups alone do not make a workload private.
- E
Use VPC peering to the AWS service endpoints instead of VPC endpoints.
Why wrong: VPC peering is for connectivity between VPCs, not for reaching managed AWS service endpoints. It is not the right mechanism for private service access.
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 workload runs in private subnets and must reach Amazon S3 and AWS Secrets Manager without using the internet or a NAT gateway. The team wants to keep the traffic on AWS private networking and avoid public IPs. Which two changes should the architect make? 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
Create an S3 gateway VPC endpoint and update the route tables for the private subnets.
Option A is correct because an S3 gateway VPC endpoint allows private subnet instances to access S3 via AWS's private network without needing internet access or a NAT gateway. The endpoint uses route table entries to direct S3 traffic through the gateway, which is a horizontally scaled, redundant component that does not require public IPs.
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 S3 gateway VPC endpoint and update the route tables for the private subnets.
Why this is correct
An S3 gateway endpoint provides private access to S3 without sending traffic over the internet. It is the correct endpoint type for S3 and integrates through route tables.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Place a NAT gateway in the public subnet so the private instances can reach AWS services.
- ✓
Create an interface VPC endpoint for AWS Secrets Manager and allow the workload security group to reach it.
Why this is correct
Secrets Manager uses an interface endpoint for private connectivity. This keeps API calls inside the AWS network and avoids the need for internet access or NAT.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Assign public IPv4 addresses to the instances and restrict them with security groups.
Why it's wrong here
Public IPs contradict the requirement to stay private and do not remove internet exposure. Security groups alone do not make a workload private.
- ✗
Use VPC peering to the AWS service endpoints instead of VPC endpoints.
Why it's wrong here
VPC peering is for connectivity between VPCs, not for reaching managed AWS service endpoints. It is not the right mechanism for private service access.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse gateway VPC endpoints (which work only for S3 and DynamoDB) with interface VPC endpoints (which work for most other AWS services), and may incorrectly assume a NAT gateway is required for all private subnet outbound traffic.
Detailed technical explanation
How to think about this question
S3 gateway endpoints use prefix lists in route tables to route traffic destined for S3's public IP ranges through the endpoint, leveraging AWS's internal network without traversing the internet. Interface VPC endpoints for Secrets Manager use AWS PrivateLink, which places an elastic network interface (ENI) in the subnet with a private IP, allowing traffic to be directed via security group rules and DNS resolution to the endpoint's private IP. In real-world scenarios, combining gateway endpoints for S3 and interface endpoints for other services like Secrets Manager is a common pattern to keep all traffic within the AWS backbone.
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: Create an S3 gateway VPC endpoint and update the route tables for the private subnets. — Option A is correct because an S3 gateway VPC endpoint allows private subnet instances to access S3 via AWS's private network without needing internet access or a NAT gateway. The endpoint uses route table entries to direct S3 traffic through the gateway, which is a horizontally scaled, redundant component that does not require public IPs.
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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