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Difficulty: EasyCost-Effective Network Routing and Data Transfer Optimization

A logistics company hosts an inventory management system on Amazon EC2 instances located in a private subnet. The application frequently uploads large archive files to an Amazon S3 bucket in the same AWS Region. Currently, the traffic routes through a NAT Gateway, which is causing high NAT Gateway data processing charges. Which configuration change should a solutions architect implement to reduce data transfer costs most effectively?

  1. Create a gateway VPC endpoint for Amazon S3 and associate it with the route table of the private subnet.Answer
  2. B
    Create an interface VPC endpoint for Amazon S3 and route the traffic through the endpoint.
  3. C
    Deploy an EC2 NAT instance in a public subnet and route the S3 traffic through it instead of the NAT Gateway.
  4. D
    Assign public IP addresses to the EC2 instances and route the traffic directly through an Internet Gateway.

Answer

Create a gateway VPC endpoint for Amazon S3 and associate it with the route table of the private subnet.
The correct option is to create a gateway VPC endpoint for Amazon S3 and associate it with the route table of the private subnet. Gateway endpoints for Amazon S3 are free of charge and provide private, direct routing over the AWS internal network, completely bypassing the NAT Gateway and eliminating data processing charges.

Step-by-Step Solution

1
Identify the source of the high data transfer costs in the current architecture.
Traffic from private EC2 instances accessing Amazon S3 in the same region is passing through a NAT Gateway, which charges for data processing.
Understanding where the cost originates allows the solutions architect to target the specific network path for optimization.
2
Evaluate AWS network routing options that bypass the NAT Gateway for Amazon S3 traffic.
A gateway VPC endpoint can route traffic from the private subnet directly to Amazon S3 over the AWS internal network.
Gateway VPC endpoints for Amazon S3 are free of charge, eliminating both NAT Gateway processing fees and regional data transfer costs.
3
Update the routing configuration.
Associate the gateway VPC endpoint with the route table of the private subnet.
This dynamically updates the routing table with a route pointing S3 traffic directly to the gateway VPC endpoint.

Key Concept

Gateway VPC Endpoints for S3 provide cost-free, direct connectivity to Amazon S3 from private subnets, bypassing NAT Gateways and avoiding data processing fees.
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Topics

Cost-Effective Network Routing and Data Transfer Optimization