Question

A financial services company hosts its primary web application on an Application Load Balancer in us-east-1. To meet a disaster recovery requirement of an RTO under 5 minutes, they deployed an identical stack behind an ALB in us-west-2. Both environments are fully warm and running. The team wants Route 53 to automatically serve traffic from us-west-2 only when the primary region becomes unhealthy, and return to us-east-1 once it recovers. Which Route 53 configuration meets this requirement?

Accepted Answer

Create a failover routing policy with the us-east-1 ALB as the primary record and the us-west-2 ALB as the secondary record, each associated with a Route 53 health check monitoring its respective ALB endpoint.

Answer

Create a weighted routing policy assigning weight 100 to the us-east-1 record and weight 0 to the us-west-2 record, and adjust weights manually during an outage.

Answer

Create a latency-based routing policy pointing to both ALBs so users are automatically routed to the lowest-latency healthy region.

Answer

Create a multivalue answer routing policy that returns both ALB IP addresses with health checks so clients can retry the healthy endpoint.