Core concept
Policies: Simple, Weighted, Latency (lowest latency to user), Geolocation, Geoproximity, Failover, Multivalue Answer.
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How it works
Health checks + failover records. Global anycast (many edge locations). SLA 100% for DNS.
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Trade-offs + gotchas
Every AWS-hosted site. Global apps needing geo-routing. Multi-region failover. Blue-green deploys.