An application is hosted on an on-premises server and an EC2 instance. A solutions architect needs to configure DNS failover so that traffic is routed to the EC2 instance only if the on-premises server becomes unavailable. Which Route 53 routing policy should be used?

Answer options:

Simple routing policy

Weighted routing policy

Failover routing policy

Latency routing policy

How to approach this question

Identify the active-passive requirement and match it to Failover routing.

Full Answer

C.Failover routing policy✓ Correct

Route 53 Failover routing policy lets you route traffic to a resource when the resource is healthy or to a different resource when the first resource is unhealthy (active-passive failover).

Common mistakes

Choosing Weighted routing with 100/0 weights, which is less efficient than native Failover routing.

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