ANS-C01 Question 255
Single answerAn e-commerce company is deploying a multi-region architecture to ensure high availability and low latency for its customers. They use an Application Load Balancer (ALB) in each region and host the website on EC2 instances behind the ALBs. The company wants to configure DNS such that users are routed to the nearest region based on latency, and failover to another region if the nearest region is unavailable. Which Route 53 routing policy should they use to meet these requirements?
- A
Geolocation Routing
- B
Latency Routing
- C
Failover Routing
- D
Latency Routing with health checks
Show answer and explanation
Correct answer: D
Explanation
Latency Routing with health checks is the correct choice because it ensures that users are routed to the region with the lowest latency while also incorporating health checks to provide failover capabilities. This meets the company's requirements for both performance and high availability in a multi-region architecture.
- A. Incorrect.
Geolocation Routing routes traffic based on the geographic location of the user, not based on latency. This does not meet the requirement to route users to the nearest region based on latency.
- B. Incorrect.
Latency Routing directs users to the region with the lowest latency, but it does not provide automatic failover to another region if the nearest region becomes unavailable.
- C. Incorrect.
Failover Routing enables routing traffic to a secondary resource if the primary resource becomes unavailable, but it does not factor in latency for routing decisions.
- D. Correct.
Latency Routing with health checks fulfills both requirements: it routes traffic to the region with the lowest latency and uses health checks to ensure failover to another region if the primary region is unavailable.