SOA-C02 Question 83
Select 3A company has deployed a web application using an Auto Scaling group behind an Application Load Balancer (ALB) in multiple Availability Zones. They want to ensure that end users are always routed to healthy instances. Additionally, they use Amazon Route 53 for DNS routing and want Route 53 to failover to a secondary region if the primary region's application becomes unhealthy. Which of the following configurations will meet these requirements?
- A
Configure health checks on the Application Load Balancer to monitor the instances' HTTP health.
- B
Set up Route 53 health checks to monitor the Application Load Balancer's DNS name in the primary region.
- C
Configure Route 53 failover routing policy with health checks for both the primary and secondary regions.
- D
Set up a Route 53 latency-based routing policy to route traffic to the lowest-latency region.
- E
Enable cross-zone load balancing on the Application Load Balancer to distribute traffic evenly across all instances.
Show answer and explanation
Correct answers: A, B, C
Explanation
To ensure high availability and failover, health checks must be configured both at the ALB level to monitor the instances and at the Route 53 level to monitor the ALB's DNS name in the primary region. Additionally, a failover routing policy in Route 53 is required to redirect traffic to the secondary region in case the primary region becomes unhealthy. Latency-based routing and cross-zone load balancing do not address the failover requirement in this scenario.
- A. Correct.
Correct. Configuring health checks on the Application Load Balancer ensures that traffic is only routed to healthy instances managed by the ALB.
- B. Correct.
Correct. Route 53 health checks can monitor the DNS name of the Application Load Balancer to determine its availability in the primary region.
- C. Correct.
Correct. A failover routing policy in Route 53 with health checks ensures traffic is redirected to the secondary region if the primary becomes unhealthy.
- D. Incorrect.
Incorrect. Latency-based routing directs traffic to the region with the lowest latency but does not ensure failover to a secondary region based on health.
- E. Incorrect.
Incorrect. Cross-zone load balancing ensures even distribution of traffic within the ALB's managed instances but does not contribute to Route 53 failover configurations.