SAA-C03 - Design Cost-Optimized Architectures - Section 4.6
Reduce data transfer cost using VPC endpoints, Amazon CloudFront and Region and Availability Zone aware design.
Identify the main sources of AWS data transfer cost - cross-AZ traffic, NAT gateway processing, and internet egress - and apply patterns that reduce them. Use VPC endpoints (Gateway endpoints for S3 and DynamoDB are free) instead of NAT egress for AWS service calls, cache egress with Amazon CloudFront, and keep traffic within one Availability Zone where the saving justifies the lower resilience.
Data transfer costVPC endpointsAmazon CloudFrontNAT gateway cost
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