ANS-C01 Question 161
Select 2Your company is deploying a highly available web application across multiple AWS Regions. The application stack includes an Amazon Route 53 configuration to handle DNS traffic routing. You are tasked with ensuring that users are routed to the nearest Region based on latency while maintaining failover capabilities if a Region becomes unavailable. Which Route 53 routing policies should you configure to achieve this?
- A
Latency-based routing with health checks
- B
Weighted routing with health checks
- C
Geolocation routing with failover records
- D
Multi-value answer routing with health checks
- E
Failover routing combined with latency-based routing
Show answer and explanation
Correct answers: A, E
Explanation
To achieve routing based on latency while maintaining failover capabilities, you would use a combination of latency-based routing (to route users to the nearest Region) and failover routing (to ensure availability when a Region is down). Health checks are critical to both configurations to ensure traffic is not routed to unhealthy endpoints. Other routing policies like weighted, geolocation, or multi-value do not fulfill the specific requirements of latency-based routing combined with failover.
- A. Correct.
Latency-based routing with health checks is correct because it allows Route 53 to route traffic to the Region that has the lowest latency for the user, while health checks ensure that traffic is only routed to healthy endpoints.
- B. Incorrect.
Weighted routing with health checks is incorrect because it is used for distributing traffic proportionally based on assigned weights, not for routing based on latency or failover.
- C. Incorrect.
Geolocation routing with failover records is incorrect because geolocation routing determines routing based on the user's geographic location, not latency, and it does not inherently support failover.
- D. Incorrect.
Multi-value answer routing with health checks is incorrect because it is primarily used for simple DNS-based load balancing and health-checking, not for latency-based or failover scenarios.
- E. Correct.
Failover routing combined with latency-based routing is correct because Failover routing ensures traffic is routed to a secondary Region when the primary is down, and latency-based routing ensures users are routed to the nearest Region under normal conditions.