SAA-C03 Design Cost-Optimized Architectures Practice Question
This SAA-C03 practice question tests your understanding of design cost-optimized 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: gateway VPC endpoints provide private connectivity 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 risk simulation workload in private subnets downloads large amounts of data from S3 through a NAT gateway. NAT data processing charges are high. What should the architect use to reduce cost? The architecture review board prefers a managed AWS-native control.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Gateway VPC endpoint for Amazon S3
A Gateway VPC Endpoint for Amazon S3 allows instances in private subnets to access S3 directly over the AWS network without traversing a NAT gateway, eliminating NAT data processing charges. This is a managed AWS-native control that meets the architecture review board's preference, as it uses AWS PrivateLink to route traffic to S3 without requiring an internet gateway or NAT.
Key principle: Gateway VPC endpoints provide private connectivity 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.
✗
A larger NAT gateway
Why it's wrong here
NAT gateways scale automatically; increasing size is not a cost optimization option.
✓
Gateway VPC endpoint for Amazon S3
Why this is correct
A gateway endpoint routes S3 traffic privately without NAT gateway data processing charges.
Related concept
Gateway VPC endpoints provide private connectivity to S3 and DynamoDB.
✗
S3 Object Lambda
Why it's wrong here
Object Lambda transforms S3 responses and does not remove NATgateway traffic cost.
✗
AWS Shield Advanced
Why it's wrong here
Shield Advanced protects against DDoS and does not reduce S3 NAT traffic charges.
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 Endpoints, thinking both reduce costs equally, but Gateway Endpoints are free to use and specifically designed for S3 and DynamoDB, while Interface Endpoints incur hourly charges and per-GB data processing fees.
Detailed technical explanation
How to think about this question
Gateway VPC Endpoints use prefix lists and route table entries to direct S3 traffic through the AWS backbone, bypassing NAT gateways and internet gateways entirely. This eliminates NAT data processing fees (currently $0.045 per GB processed) and can also reduce data transfer costs because traffic stays within the AWS network. In real-world scenarios, workloads like risk simulations that download terabytes from S3 can see cost reductions of 50-70% by switching from NAT to a Gateway Endpoint.
KKey Concepts to Remember
Gateway VPC endpoints provide private connectivity to S3 and DynamoDB.
They are free to use; you only pay for the data transferred to S3.
Gateway endpoints use route tables to direct traffic to S3.
They eliminate the need for NAT gateways or internet gateways for S3 access.
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
Gateway VPC endpoints provide private connectivity 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
Got this wrong? Here's your next step.
Review gateway VPC endpoints provide private connectivity to S3 and DynamoDB., then practise related SAA-C03 questions on the same topic to reinforce the concept.
Design Cost-Optimized Architectures — This question tests Design Cost-Optimized Architectures — Gateway VPC endpoints provide private connectivity to S3 and DynamoDB..
What is the correct answer to this question?
The correct answer is: Gateway VPC endpoint for Amazon S3 — A Gateway VPC Endpoint for Amazon S3 allows instances in private subnets to access S3 directly over the AWS network without traversing a NAT gateway, eliminating NAT data processing charges. This is a managed AWS-native control that meets the architecture review board's preference, as it uses AWS PrivateLink to route traffic to S3 without requiring an internet gateway or NAT.
What should I do if I get this SAA-C03 question wrong?
Review gateway VPC endpoints provide private connectivity to S3 and DynamoDB., then practise related SAA-C03 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
Gateway VPC endpoints provide private connectivity to S3 and DynamoDB.
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Question Discussion
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