A company is designing a highly available, multi-region architecture for a web application. The application uses Amazon Route 53, Amazon CloudFront, Application Load Balancers (ALB), and Amazon EC2. The company wants to ensure that if the primary region goes down, traffic is automatically routed to the secondary region. Which combination of configurations should be used? (Select TWO)

Answer options:

Configure Route 53 with a Failover routing policy pointing to the CloudFront distributions.

Configure CloudFront Origin Groups with the primary ALB as the primary origin and the secondary ALB as the secondary origin.

Use AWS Global Accelerator to route traffic to the ALBs in both regions.

Configure the ALB in the primary region to forward traffic to the ALB in the secondary region.

Use Amazon S3 Cross-Region Replication to sync the EC2 instances.

Configure Route 53 health checks on the EC2 instances directly.

How to approach this question

Identify the failover mechanisms for CloudFront and ALBs.

Full Answer

Configure Route 53 with a Failover routing policy pointing to the CloudFront distributions., Configure CloudFront Origin Groups with the primary ALB as the primary origin and the secondary ALB as the secondary origin.

CloudFront Origin Groups provide native active-passive failover between origins (ALBs). Alternatively, AWS Global Accelerator provides anycast IP routing and fast regional failover for ALBs.

Common mistakes

Trying to use Route 53 failover in front of CloudFront (CloudFront is global, so Route 53 failover between distributions is complex and less efficient than Origin Groups).

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