SAA-C03 Gateway VPC endpoints are free to use. 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 are free to use.. 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 media processing workflow 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?
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 via the AWS network without traversing a NAT gateway, eliminating NAT data processing charges. This is the most cost-effective solution because NAT gateway costs are incurred per GB of data processed, and using a gateway endpoint avoids those charges entirely.
Key principle: Gateway VPC endpoints are free to use.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
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.
✓
Gateway VPC endpoint for Amazon S3
Why this is correct
A gateway endpoint routes S3 traffic privately without NAT gateway data processing charges.
NAT gateways scale automatically; increasing size is not a cost optimization option.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may think a larger NATgateway would improve throughput and lower costs, but in reality, it only increases both hourly and per-GB charges, while a gateway VPC endpoint eliminates the data processing cost entirely.
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 internet gateways and NAT devices. Under the hood, they leverage AWS PrivateLink for S3, ensuring traffic stays within the AWS network and is not subject to NAT data processing fees (typically $0.045 per GB). In real-world scenarios, this can reduce costs by thousands of dollars monthly for high-volume media processing workflows.
KKey Concepts to Remember
Gateway VPC endpoints are free to use.
They provide private connectivity to S3 and DynamoDB.
Traffic to S3 through a gateway endpoint bypasses NAT gateways and internet gateways.
Gateway endpoints are configured as route table entries.
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 are free to use.
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 are free to use., 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 are free to use..
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 via the AWS network without traversing a NAT gateway, eliminating NAT data processing charges. This is the most cost-effective solution because NAT gateway costs are incurred per GB of data processed, and using a gateway endpoint avoids those charges entirely.
What should I do if I get this SAA-C03 question wrong?
Review gateway VPC endpoints are free to use., 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 are free to use.
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Question Discussion
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