ANS-C01 Question 368
Select 2Your company is deploying a highly available web application across multiple AWS Regions. The application uses an Application Load Balancer (ALB) in each Region and relies on Route 53 for DNS-based traffic routing. You are tasked with ensuring that traffic is routed to the most appropriate Region based on latency while providing automatic failover in case one Region becomes unavailable. Which combination of Route 53 routing policies should you use?
- A
Latency-based routing policy
- B
Geolocation routing policy
- C
Failover routing policy
- D
Simple routing policy
- E
Weighted routing policy
Show answer and explanation
Correct answers: A, C
Explanation
To achieve the requirements of routing traffic based on latency and ensuring failover, you need to combine the Latency-based routing policy with the Failover routing policy. Latency-based routing directs traffic to the Region with the lowest latency, optimizing performance, while Failover routing ensures traffic is redirected to a backup Region in case of a failure. Other routing policies, such as Geolocation or Weighted, do not meet both criteria simultaneously.
- A. Correct.
Latency-based routing policy is used to route traffic to the Region with the lowest latency for the user, which ensures an optimal user experience.
- B. Incorrect.
Geolocation routing policy routes traffic based on the user's geographic location. While it can control traffic distribution, it does not ensure latency optimization.
- C. Correct.
Failover routing policy ensures automatic redirection of traffic to a backup Region if the primary Region becomes unavailable. This is essential for high availability.
- D. Incorrect.
Simple routing policy is the default policy but does not support advanced traffic routing requirements such as latency-based selection or failover.
- E. Incorrect.
Weighted routing policy allows traffic distribution based on assigned weights but does not incorporate latency-based decisions or automatic failover.