Exam AWS Certified Solutions Architect - Associate SAA-C03 topic 1 question 42 discussion

Deploying a gateway VPC endpoint for Amazon S3 is the most cost-effective way for the company to avoid Regional data transfer charges. A gateway VPC endpoint is a network gateway that allows communication between instances in a VPC and a service, such as Amazon S3, without requiring an Internet gateway or a NAT device. Data transfer between the VPC and the service through a gateway VPC endpoint is free of charge, while data transfer between the VPC and the Internet through an Internet gateway or NAT device is subject to data transfer charges. By using a gateway VPC endpoint, the company can reduce its data transfer costs by eliminating the need to transfer data through the NAT gateway to access Amazon S3. This option would provide the required connectivity to Amazon S3 and minimize data transfer charges.

This link clearly states that "VPC gateway endpoints allow communication to Amazon S3 and Amazon DynamoDB without incurring data transfer charges within the same Region". On the other hand NAT gateway incurs additional data processing charges. Hence, C is the correct answer. https://aws.amazon.com/blogs/architecture/overview-of-data-transfer-costs-for-common-architectures/

C for sure

Ans C - excellent explanation by SilentMilli

VPC gatwway endpoint is free to use, but only available for S3 and DynamoDB

Gateway VPC allows direct access to S3 without going through public internet. This is the de-facto way to save cost for S3 to VPC traffic. Correct answer is C

Avoid regional data transfer charge - VPC endpoint

https://aws.amazon.com/blogs/storage/managing-amazon-s3-access-with-vpc-endpoints-and-s3-access-points/

Gateway Endpoint bests suits the requirement

Answer is C: An S3 VPC endpoint provides a way for an S3 request to be routed through to the Amazon S3 service, without having to connect a subnet to an internet gateway. The S3 VPC endpoint is what's known as a gateway endpoint.

the EC2 instances are downloading and uploading images to S3, configuring a gateway VPC endpoint will allow them to access S3 without crossing Availability Zones or regions, eliminating regional data transfer charges

Gateway VPC endpoints provide reliable connectivity to Amazon S3 without requiring an internet gateway or a NAT device for your VPC.

Option C is the right answer.

By deploying a gateway VPC endpoint for S3, the company can establish a direct connection between their VPC and S3 without going through the internet gateway or NAT gateway. This enables traffic between the EC2 and S3 to stay within the Amazon network, avoiding Regional data transfer charges. A suggests launching the NAT gateway in each AZ. While this can help with availability and redundancy, it does not address the issue of data transfer charges, as the traffic would still traverse the NAT gateways and incur data transfer fees. B suggests replacing the NAT gateway with a NAT instance. However, this solution still involves transferring data between the instances and S3 through the NAT instance, which would result in data transfer charges. D suggests provisioning an EC2 Dedicated Host to run the EC2. While this can provide dedicated hardware for the instances, it does not directly address the issue of data transfer charges.

Option C is the answer.

A gateway VPC endpoint is a fully managed service that allows connectivity from a VPC to AWS services such as S3 without the need for a NAT gateway or a public internet gateway. By deploying a Gateway VPC endpoint for Amazon S3, the company can ensure that all S3 traffic remains within the VPC and does not cross the regional boundary. This eliminates regional data transfer charges and provides a more cost-effective solution for the company.

C - gateway VPC endpoint.