Question 21
Domain 2: Design for New SolutionsA solutions architect needs to improve business continuity for a public application that is deployed in multiple AWS Regions. Which AWS service and feature should be used to direct users to a healthy regional endpoint when another endpoint becomes unavailable?
Correct answer: B
Explanation
Use Amazon Route 53 routing methods to steer client requests among endpoints, including directing traffic away from unhealthy targets to support continuity. — AWS networking concepts (for example, Route 53, routing methods)
Why each option is right or wrong
A. Use Amazon Route 53 to increase the instance size in the active Region during an endpoint failure.
Route 53 routing methods direct DNS traffic; they do not resize compute resources.
B. Use Amazon Route 53 routing methods to send users to a healthy endpoint in another Region.
The source material identifies AWS networking concepts for business continuity as including Amazon Route 53 and routing methods. In this multi-Region availability scenario, the applicable use is to route users to a healthy regional endpoint when another endpoint is unavailable.
C. Use Amazon Route 53 to replicate application data automatically between Regions during an endpoint failure.
Route 53 routing methods control request direction; they do not perform cross-Region data replication.
D. Use Amazon Route 53 to create a private subnet path between Regions for failover traffic.
Route 53 routing methods resolve and direct DNS queries; they do not create subnet connectivity paths.