Architects modeling a new permitting stack find chatty application…

Question

Architects modeling a new permitting stack find chatty application tiers talking constantly to a database and several AWS APIs. Which design choice most directly reduces data-transfer and NAT charges?

Accepted Answer

Colocate chatty app and database tiers in the same Region (and preferably same AZ where latency and blast-radius tradeoffs allow) and use VPC endpoints or PrivateLink for AWS APIs instead of hairpinning through NAT Gateways. — Chatty neighbors should live on the same block—same Region/AZ when you can—and talk to AWS APIs through endpoints, not a tollbooth NAT. Cross-Region gossip and public DB endpoints are how transfer bills (and auditors) get loud.

Answer

Force every database query across Regions for “geo diversity” even when RTO does not require multi-Region active traffic.

Answer

Send all private-subnet AWS API calls exclusively through a public NAT Gateway with no interface or gateway endpoints.

Answer

Mirror the entire production database to the internet with public IPs so clients bypass VPC networking controls.

Architects modeling a new permitting stack find chatty application tiers talking constantly to a database and several AWS APIs. Which design choice most directly reduces data-transfer and NAT charges?

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