AWS Certified Advanced Networking – Specialty (ANS-C01)Network DesignEasy
An e-commerce company operates a highly available web application across multiple AWS Regions. They want to ensure that users are always directed to the closest healthy endpoint to minimize latency. If an endpoint becomes unhealthy, traffic should automatically fail over to another healthy endpoint. Which Amazon Route 53 routing policy combination should be used?
- ASimple Routing Policy with CNAME records
- BLatency Routing Policy with Health Checks
- CWeighted Routing Policy with Health Checks
- DGeolocation Routing Policy with Failover
Show answer & explanationAnswer & explanation
Correct answer: B. Latency Routing Policy with Health Checks
Latency routing policy directs users to the AWS region that provides the lowest latency. Combining this with health checks ensures that if the lowest-latency endpoint becomes unhealthy, Route 53 will automatically route traffic to the next closest healthy endpoint, meeting both the low-latency and high-availability requirements.
Why the other options are wrong
- A. Simple routing does not provide any health check or failover capabilities, nor does it consider latency.
- C. Weighted routing distributes traffic based on weights, not primarily on latency, and would not guarantee the closest endpoint.
- D. Geolocation routing directs users based on their geographic location, which might not always be the lowest latency, and while it can use failover, latency is the primary requirement here.
Route 53 Latency Routing Policy
An Amazon Route 53 routing policy that directs user requests to the AWS region that provides the lowest latency for the user. When combined with health checks, it provides automatic failover to the next lowest latency healthy endpoint.
- Routes traffic based on observed network latency.
- Requires multiple endpoints in different AWS regions.
- When combined with health checks, provides high availability and failover.
- Goal is to minimize user response times.
Memory trick: Route 53: Latency is Life, Health is Happiness.