A company is using AWS Cost Explorer and notices a significant increase in data transfer costs. Upon investigation, they find that EC2 instances in a private subnet are downloading large amounts of data from Amazon S3 via a NAT Gateway. How can the architect reduce these data transfer costs to zero?

Answer options:

A.

Move the EC2 instances to a public subnet and assign them Elastic IP addresses.

B.

Create a Gateway VPC Endpoint for Amazon S3 and update the private subnet route tables to point S3 traffic to the endpoint.

C.

Create an Interface VPC Endpoint (AWS PrivateLink) for Amazon S3.

D.

Use Amazon CloudFront to cache the S3 data.

How to approach this question

Identify the free VPC endpoint type for S3.

Full Answer

B.Create a Gateway VPC Endpoint for Amazon S3 and update the private subnet route tables to point S3 traffic to the endpoint.✓ Correct

Gateway VPC Endpoints for Amazon S3 are completely free. They route traffic from your VPC directly to S3 over the AWS network, bypassing the NAT Gateway and eliminating its data processing charges.

Common mistakes

Choosing Interface Endpoints, which cost money.

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