- A
Add an internet gateway to the VPC and route private subnet traffic through it.
Why wrong: An internet gateway exposes the VPC to the public internet and does not keep traffic private.
- B
Use an Amazon S3 gateway VPC endpoint in the route tables for the private subnets.
A gateway VPC endpoint for S3 keeps traffic between the VPC and S3 on the AWS network without using the public internet or a NAT gateway. This is the standard private-connectivity pattern for S3 access from private subnets. It also simplifies the architecture and reduces NAT-related cost while preserving access to the bucket from workloads that must remain nonpublic.
- C
Use a security group rule that allows outbound traffic to the S3 public IP range.
Why wrong: Security groups control traffic, but they do not create private connectivity to S3 or prevent internet traversal by themselves.
- D
Create a VPC peering connection to the S3 service VPC.
Why wrong: Amazon S3 is not accessed through customer-managed VPC peering connections, so this is not a valid design.
Quick Answer
The correct answer is to use an S3 gateway VPC endpoint for private subnets. This design is correct because a gateway endpoint allows instances in private subnets to access Amazon S3 over AWS’s internal network, without requiring a NAT gateway, internet gateway, or any public IP address. The endpoint is added to the route table of the private subnets, and traffic destined for the S3 prefix list is routed directly through the endpoint, keeping all data transfer within the AWS backbone. On the SAA-C03 exam, this scenario tests your understanding of when to choose a gateway endpoint over an interface endpoint or NAT—a common trap is selecting a NAT gateway or a VPC peering connection, which would introduce unnecessary cost or internet exposure. Remember that S3 and DynamoDB are the only two services that support gateway endpoints, and they are free to use. Memory tip: “Gateway for S3, no NAT needed—route it straight through the prefix list.”
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.
An engineering team runs application servers in private subnets. The instances must download patches and software packages from Amazon S3, but the company does not want the traffic to traverse the internet or a NAT gateway. Which design should they use?
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
Use an Amazon S3 gateway VPC endpoint in the route tables for the private subnets.
Option B is correct because an S3 Gateway VPC endpoint allows instances in private subnets to access Amazon S3 without traversing the internet or a NAT gateway. The endpoint uses AWS’s internal network and is added to the route table of the private subnets, directing S3 traffic through the endpoint prefix list. This design meets the requirement of keeping traffic off the internet while providing secure, low-latency access to S3.
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.
- ✗
Add an internet gateway to the VPC and route private subnet traffic through it.
Why it's wrong here
An internet gateway exposes the VPC to the public internet and does not keep traffic private.
- ✓
Use an Amazon S3 gateway VPC endpoint in the route tables for the private subnets.
Why this is correct
A gateway VPC endpoint for S3 keeps traffic between the VPC and S3 on the AWS network without using the public internet or a NAT gateway. This is the standard private-connectivity pattern for S3 access from private subnets. It also simplifies the architecture and reduces NAT-related cost while preserving access to the bucket from workloads that must remain nonpublic.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Use a security group rule that allows outbound traffic to the S3 public IP range.
Why it's wrong here
Security groups control traffic, but they do not create private connectivity to S3 or prevent internet traversal by themselves.
- ✗
Create a VPC peering connection to the S3 service VPC.
Why it's wrong here
Amazon S3 is not accessed through customer-managed VPC peering connections, so this is not a valid design.
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, or mistakenly think that a security group rule alone can bypass the need for a routing path to the internet, when in fact routing decisions are made at the subnet route table level, not by security groups.
Detailed technical explanation
How to think about this question
An S3 Gateway VPC endpoint is a horizontally scaled, redundant, and highly available component that uses AWS PrivateLink to route S3 traffic over the AWS backbone without leaving the AWS network. The endpoint is associated with a prefix list (e.g., com.amazonaws.region.s3) in the route table, and traffic destined for S3 is automatically directed to the endpoint. This design also avoids data transfer costs associated with NAT gateways or internet gateways, making it cost-effective for high-volume patch downloads.
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: Use an Amazon S3 gateway VPC endpoint in the route tables for the private subnets. — Option B is correct because an S3 Gateway VPC endpoint allows instances in private subnets to access Amazon S3 without traversing the internet or a NAT gateway. The endpoint uses AWS’s internal network and is added to the route table of the private subnets, directing S3 traffic through the endpoint prefix list. This design meets the requirement of keeping traffic off the internet while providing secure, low-latency access to S3.
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
This SAA-C03 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the SAA-C03 exam.
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