A network that survives losing an entire Region.
Two failover mechanisms, two different layers, used together.
Steady stateTransit Gateway peering replicates data cross-region, continuously
Region failsRoute 53 Failover redirects new DNS lookups — bounded by client TTL
Faster pathGlobal Accelerator's static-IP failover skips DNS entirely
The always-on cross-region replication is what makes the failover moment a traffic redirection, not also a data-availability problem.