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Difficulty: MediumCost-Effective Network Routing and Data Transfer Optimization

A financial data analysis application runs on Amazon EC2 instances in a private subnet. The application downloads 50 TB50\text{ TB} of financial market data monthly from an Amazon S3 bucket located in the same AWS Region. Currently, all outbound internet traffic from the private subnet is routed through a NAT Gateway. Which action should a solutions architect take to minimize the data transfer and processing costs most cost-effectively?

  1. Deploy a Gateway VPC Endpoint for Amazon S3 in the VPC and update the private subnet's route table to direct S3 traffic to the endpoint.Answer
  2. B
    Configure an Interface VPC Endpoint for Amazon S3 in the VPC and route all S3 traffic through it.
  3. C
    Keep the existing routing through the NAT Gateway and purchase a Compute Savings Plan to lower the NAT Gateway data processing fees.
  4. D
    Establish an AWS Transit Gateway, attach the VPC, and route the S3 traffic through a NAT Gateway managed by the Transit Gateway.

Answer

Deploy a Gateway VPC Endpoint for Amazon S3 in the VPC and update the private subnet's route table to direct S3 traffic to the endpoint.
The correct solution is to deploy a Gateway VPC Endpoint for Amazon S3. This endpoint is configured in the VPC route table and routes S3 traffic directly through the AWS internal network. Because Gateway VPC Endpoints do not incur any hourly or data processing charges, this completely eliminates the 0.045perGB0.045 per \text{GB} NAT Gateway processing fee for the 50 TB50\text{ TB} of S3 traffic.

Step-by-Step Solution

1
Analyze the current architecture and identify cost drivers.
The application transfers 50 TB50\text{ TB} of data monthly from Amazon S3 through a NAT Gateway, which charges 0.045perGB0.045 per \text{GB} for data processing, leading to significant monthly charges.
Before proposing an optimization, the current data transfer path and associated pricing model must be understood.
2
Evaluate alternative routing mechanisms for Amazon S3.
Amazon S3 supports both Gateway VPC Endpoints and Interface VPC Endpoints. Gateway VPC Endpoints are free of charge, whereas Interface VPC Endpoints cost 0.01perGB0.01 per \text{GB} plus hourly fees.
Finding the lowest-cost routing path for S3 traffic avoids routing through public gateways.
3
Select the most cost-effective option and formulate the routing change.
Deploying a Gateway VPC Endpoint for Amazon S3 and updating the route table routes all S3 traffic directly over the AWS internal network for free, reducing the NAT Gateway processing costs to zero.
Updating route tables ensures that only S3 traffic is diverted to the endpoint, while other internet-bound traffic continues using the NAT Gateway.

Key Concept

Gateway VPC Endpoints for S3 and DynamoDB provide free, secure, private routing within the AWS network, bypassing NAT Gateways and eliminating data processing charges.
Estimated Time:1m 30s
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Topics

Cost-Effective Network Routing and Data Transfer Optimization