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.

Option C (correct). Deploy a gateway VPC endpoint for Amazon S3. A VPC endpoint for Amazon S3 allows you to access Amazon S3 resources within your VPC without using the Internet or a NAT gateway. This means that data transfer between your EC2 instances and S3 will not incur Regional data transfer charges. Option A (wrong), launching a NAT gateway in each Availability Zone, would not avoid data transfer charges because the NAT gateway would still be used to access S3. Option B (wrong), replacing the NAT gateway with a NAT instance, would also not avoid data transfer charges as it would still require using the Internet or a NAT gateway to access S3. Option D (wrong), provisioning an EC2 Dedicated Host, would not affect data transfer charges as it only pertains to the physical host that the EC2 instances are running on and not the data transfer charges for accessing.

This one was obvious. with VPC gateway for S3, the traffic will not leave AWS and directly go to S3. Therefore will reduce the cost of outgoing data.

Gateway VPC endpoint are most suitable for privately accessing S3 here.

Using a gateway VPC endpoint for Amazon S3 is the most cost-effective solution because it enables instances within the VPC to communicate directly with Amazon S3 without incurring data transfer charges via a NAT gateway. Here's how it addresses the problem: Avoids NAT Gateway Charges for S3 Access: NAT gateways incur data processing and data transfer charges when instances access S3. A gateway VPC endpoint eliminates the need to route traffic through the NAT gateway by enabling direct communication between EC2 instances and S3. No Data Transfer Costs for Intra-Region S3 Access: Data transferred between Amazon S3 and resources in the same AWS Region through a gateway VPC endpoint is free of charge. Highly Available and Managed: Gateway VPC endpoints are highly available and fully managed by AWS, requiring no additional operational overhead.

Correct

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.