AWS Certified CloudOps Engineer Associate SOA-C03 Practice Question

A company runs its production web application on Amazon EC2 instances in us-east-1 behind an Application Load Balancer (ALB). An identical standby stack has been deployed in us-west-2 for disaster recovery. The company wants Amazon Route 53 to direct traffic to the us-west-2 ALB only when the us-east-1 ALB becomes unhealthy, while keeping DNS failover latency as low as possible. Which Route 53 configuration will meet these requirements?

Create multivalue answer records for both ALBs and configure Route 53 health checks on each record to remove unhealthy answers.
Create two alias A records that use the Weighted routing policy with weights of 100 (us-east-1) and 0 (us-west-2). Attach a health check to the us-east-1 record.
Create two alias A records that use the Latency routing policy, one for each Region, and attach a health check to the us-west-2 record.
Create two alias A records that use the Failover routing policy. Point the PRIMARY record to the us-east-1 ALB, the SECONDARY record to the us-west-2 ALB, and associate a Route 53 health check with the PRIMARY record.

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Answer Description

Failover routing is designed for active-passive architectures. You create two alias records that point to the primary and secondary ALBs, mark the primary record as PRIMARY, and attach a health check that monitors the us-east-1 ALB. When the health check fails, Route 53 immediately stops returning the PRIMARY record and answers only with the SECONDARY record, sending all new queries to the us-west-2 ALB. Weighted, latency-based, or multivalue records can include health checks, but they are intended for different traffic-distribution goals and do not provide the same straightforward active-passive behavior. Using a weight of 0 on a weighted record is supported, yet failover routing is the standard and simpler approach recommended by AWS for this use case.

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