SAP-C02 Question 195
Single answerA global e-commerce company hosts its application in multiple AWS regions to ensure low latency and high availability for its customers worldwide. They use Amazon Route 53 for DNS. The company wants to direct users to the application instance with the lowest latency while providing a fallback mechanism in case any region becomes unavailable. Which routing policy should they use in Amazon Route 53 to meet this requirement?
- A
Geolocation routing
- B
Latency-based routing with a failover configuration
- C
Weighted routing
- D
Multi-value answer routing
Show answer and explanation
Correct answer: B
Explanation
Latency-based routing in Amazon Route 53 is designed to route users to the endpoint with the lowest latency, ensuring better application performance. By combining latency-based routing with a failover configuration, the company can automatically redirect traffic to a backup region if the primary region becomes unavailable. This approach meets the requirement for both low latency and high availability.
- A. Incorrect.
Geolocation routing directs traffic based on the geographic location of the user, not based on latency. This is not suitable for a scenario where latency-based redirection is a requirement.
- B. Correct.
Latency-based routing with a failover configuration ensures that users are directed to the endpoint with the lowest latency. The failover configuration provides a backup mechanism in case any region becomes unavailable, making it the correct option for this scenario.
- C. Incorrect.
Weighted routing allows traffic to be distributed across multiple resources based on predefined weights. It does not consider latency or provide automatic failover, so it is not suitable for this requirement.
- D. Incorrect.
Multi-value answer routing provides multiple IP addresses for DNS queries to improve availability, but it does not automatically select the endpoint with the lowest latency or provide a robust failover mechanism.