SL#143 - AWS Services (31/120) - Amazon Route 53: The 18% Rule, Latency Records, and a Two-Region Failover Tested by Killing One

Route 53 is an authoritative DNS service with a health-check engine bolted on. This reference covers the model, the pricing dimensions that surprise people, the quotas that bite, and a two-Region latency failover you can build, break and verify from a script.