A web application runs on Amazon EC2 instances in the us-east-1 Region and the us-west-2 Region. The instances run behind an Application Load Balancer (ALB) in each Region. An Amazon Route 53 hosted…

Question

Options

• AImplement a Route 53 health check and a failover routing policy for the hosted zone. Configure
• BImplement a Route 53 health check and a latency routing policy for the hosted zone. Configure
• CIn us-east-1, create an Amazon CloudWatch alarm that enters ALARM state when an EC2
• DIn us-west-2, create an Amazon CloudWatch alarm that enters ALARM state when resources in

• A
  75% (15)
• B
  15% (3)
• C
  5% (1)
• D
  5% (1)

Explanation

The requirement is classic active-passive (production in us-east-1, DR in us-west-2 "only for failover"). The most operationally efficient and purpose-built solution is Route 53 failover routing combined with health checks. With failover routing, Route 53 designates one record as PRIMARY (us- east-1) and another as SECONDARY (us-west-2). Route 53 continuously evaluates the health check associated with the primary endpoint (commonly the ALB DNS name or a specific health-check path). If the primary fails, Route 53 automatically returns the secondary record, directing client DNS resolution to the DR region. This ensures us-west-2 is used only when us- east-1 is unhealthy, directly matching the requirement.

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