A municipal web app has a primary ALB in one Region and a DR ALB in another. How should DNS fail users over when the primary becomes unhealthy?
Select an answer to reveal the explanation.
Short Explanation
Route 53 health checks are the traffic cop: when the primary ALB looks sick, DNS points folks to the DR ALB without mailing out new IP lists.
Full Explanation
Route 53 failover routing combined with health checks automatically directs queries to a secondary endpoint when the primary fails health evaluation. Hard-coded IPs, unmonitored equal weights, and host-file gymnastics are not resilient DNS failover designs.