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.. 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 design must avoid adding custom operational scripts.
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 the most cost-effective and operationally simple solution because it requires no custom scripts and no changes to routing beyond adding the endpoint.
Key principle: Gateway VPC endpoints provide private connectivity to S3.
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.
✗
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 VPC Endpoints, assuming both incur hourly charges, or mistakenly think a larger NAT gateway is a cost-saving measure when it actually increases costs.
Detailed technical explanation
How to think about this question
A Gateway VPC Endpoint uses prefix lists and route table entries to direct S3 traffic through the AWS backbone, bypassing the internet gateway and NAT gateway entirely. Under the hood, it leverages AWS PrivateLink with a gateway endpoint type (not interface endpoint), meaning no additional ENI or hourly charges apply—only standard S3 data transfer costs. In a real-world scenario, a workload downloading terabytes of simulation data from S3 could see NAT processing charges drop to zero while maintaining private subnet isolation.
KKey Concepts to Remember
Gateway VPC endpoints provide private connectivity to S3.
S3 traffic via a Gateway endpoint bypasses NAT gateways.
Eliminates NAT gateway data processing charges for S3 traffic.
Gateway endpoints are free to create and use for S3 and DynamoDB.
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.
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., 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..
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 the most cost-effective and operationally simple solution because it requires no custom scripts and no changes to routing beyond adding the endpoint.
What should I do if I get this SAA-C03 question wrong?
Review gateway VPC endpoints provide private connectivity to S3., 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.
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Question Discussion
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