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Difficulty: MediumRoute 53 Routing Policies and DNS Failover Strategies

A company hosts a critical web application on Amazon EC2 instances behind an Application Load Balancer (ALB) in the us-east-1 Region. The company wants to implement an active-passive disaster recovery (DR) strategy using a warm standby environment in the us-west-2 Region. The solution must automatically route user traffic to the secondary region with minimal downtime if the primary region's application becomes unavailable. Which two configuration steps must a solutions architect take to meet these requirements? (Choose two.)

  1. Configure a Route 53 failover alias record for the apex domain pointing to the primary Application Load Balancer, set the record type as Primary, and enable Evaluate Target Health.Answer
  2. Configure a Route 53 failover alias record for the apex domain pointing to the secondary Application Load Balancer, set the record type as Secondary, and enable Evaluate Target Health.Answer
  3. C
    Configure Route 53 latency routing records for the apex domain pointing to both Application Load Balancers, and rely on regional latency differences to manage active-passive failover.
  4. D
    Configure Route 53 to perform automatic failover of database connections directly to an Amazon RDS read replica in the secondary region to minimize recovery time objective (RTO).
  5. E
    Keep the Application Load Balancer and EC2 instances in the secondary region shut down, and rely on Route 53 health check failover to automatically boot them up when the primary region fails.

Answer

Configure primary and secondary Route 53 failover alias records pointing to the respective Application Load Balancers, ensuring Evaluate Target Health is enabled for both.
The correct options state that we must configure a Route 53 failover alias record pointing to the primary Application Load Balancer as 'Primary', and another failover alias record pointing to the secondary Application Load Balancer as 'Secondary', both with 'Evaluate Target Health' enabled. This setup creates a fully automated active-passive DNS failover configuration.

Step-by-Step Solution

1
Analyze the disaster recovery strategy requirements.
Identify that an active-passive failover configuration is needed for the apex domain pointing to Application Load Balancers in two different regions.
This determines that Route 53 failover routing policies are the correct mechanism to automatically redirect traffic.
2
Configure the primary Route 53 record.
Create a failover alias record pointing to the primary ALB in us-east-1, mark it as Primary, and enable Evaluate Target Health.
This allows Route 53 to monitor the health of the primary ALB using its target health metrics and determine when to fail over.
3
Configure the secondary Route 53 record.
Create a failover alias record pointing to the secondary ALB in us-west-2, mark it as Secondary, and enable Evaluate Target Health.
This provides a backup endpoint for Route 53 to route traffic to once the primary endpoint is determined to be unhealthy.

Key Concept

Route 53 Failover Routing Policy allows you to configure active-passive failover configurations. Using alias records with Evaluate Target Health enables automatic redirection without the need for manual DNS updates.
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Topics

Route 53 Routing Policies and DNS Failover Strategies

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