Question

A company hosts a critical web application in the us-east-1 Region behind an internet-facing Application Load Balancer (ALB), with a warm standby stack behind a second ALB in us-west-2. Both ALBs share the same domain name, app.example.com, in a public Route 53 hosted zone. The networking team must ensure that if the primary ALB in us-east-1 becomes unhealthy, DNS automatically directs users to the us-west-2 ALB, and that traffic returns to the primary once it recovers. Which Route 53 configuration meets these requirements?

Accepted Answer

Create two failover alias records for app.example.com: a PRIMARY record targeting the us-east-1 ALB with an associated health check, and a SECONDARY record targeting the us-west-2 ALB.

Answer

Create two weighted alias records for app.example.com with weights of 100 and 0, and attach a health check only to the weight-100 record.

Answer

Create a single multivalue answer record listing both ALB IP addresses with a health check on each value.

Answer

Create two latency-based alias records for app.example.com, one per Region, and attach a health check to the us-east-1 record only.