SAA-C03 Q451 · DR

Question

A company runs a web application in a single AWS Region. A solutions architect wants to ensure that the web application can continue to operate if the application becomes unavailable in the Region. Which solution will meet this requirement?

Accepted Answer

**Option A: Deploy in multiple Regions + Route 53 DNS health checks**

Let's map each requirement:

1. **'If the application becomes unavailable in the Region'** — This explicitly states a **Region-level failure**. The only way to survive a Region-level failure is to have the application deployed in **multiple Regions**. No amount of Availability Zone redundancy within a single Region helps if the entire Region goes down.

2. **'Continue to operate'** — Traffic must be automatically redirected to the healthy Region. **Amazon Route 53 DNS health checks** actively monitor endpoint health and can be associated with DNS records. When combined with a **failover routing policy**, Route 53 detects the primary Region is unhealthy and automatically routes traffic to the secondary Region.

**How it

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