You want to design a highly available web app on AWS that stays online even if an entire region fails. Which combination should you use?

hard📝 Application Q15 of 15

AWS - Architecture Best Practices

ADeploy instances in multiple regions with Route 53 latency-based routing and health checks

BDeploy instances in multiple AZs within one region and use an Elastic Load Balancer

CUse a single instance in one AZ with Auto Scaling enabled

DDeploy instances in one AZ and use Amazon S3 for static content

Step-by-Step Solution

Solution:

Step 1: Understand region failure scope
Multi-AZ protects against AZ failure, but not entire region failure.
Step 2: Choose multi-region design
Deploying in multiple regions with Route 53 routing and health checks ensures availability if one region fails.
Final Answer:
Deploy instances in multiple regions with Route 53 latency-based routing and health checks -> Option A
Quick Check:
Multi-region + Route 53 = survive region failure [OK]

Quick Trick: Multi-region with Route 53 handles region failures [OK]

Common Mistakes:

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