ANS-C01 Question 24
Select 2You are designing a global application that serves users from multiple regions. To minimize latency, you need to ensure that user traffic is routed to the nearest region. The application uses a combination of an Amazon CloudFront distribution, Elastic Load Balancers (ELBs) in each region, and Amazon Route 53 for traffic routing. Which configuration should you implement to meet these requirements?
- A
Use Amazon Route 53 with a Geolocation routing policy to direct users to the nearest regional Elastic Load Balancer.
- B
Configure Amazon CloudFront with multiple origins, each pointing to an Elastic Load Balancer in a different region, and enable Origin Groups for failover.
- C
Use Amazon Route 53 with a Latency-based routing policy to direct users to the nearest regional Elastic Load Balancer.
- D
Set up Amazon CloudFront with a single origin pointing to the Elastic Load Balancer in the primary region and rely on Route 53 for failover to secondary regions.
- E
Combine Amazon CloudFront with Route 53's Weighted routing policy to distribute traffic across multiple regional Elastic Load Balancers.
Show answer and explanation
Correct answers: B, C
Explanation
To minimize latency for a global application, the best approach is to use Amazon CloudFront with multiple origins pointing to regional Elastic Load Balancers. This setup ensures that CloudFront routes user requests to the nearest origin automatically. Additionally, Amazon Route 53 with a Latency-based routing policy can be used to route traffic directly to the region with the lowest latency for scenarios where CloudFront is not in use. These options work together to optimize user experience by reducing latency and providing failover capabilities.
- A. Incorrect.
Amazon Route 53 Geolocation routing directs users based on their geographic location, which may not always choose the lowest-latency region. This is not the best option for minimizing latency.
- B. Correct.
Configuring Amazon CloudFront with multiple origins and enabling Origin Groups allows CloudFront to route requests to the nearest Elastic Load Balancer and provides failover capabilities, which is suitable for minimizing latency and improving availability.
- C. Correct.
Amazon Route 53 Latency-based routing is specifically designed to route users to the region with the lowest latency, making it an appropriate choice for this requirement.
- D. Incorrect.
Using a single origin on Amazon CloudFront with failover to secondary regions does not minimize latency, as it routes all traffic to the primary region unless a failure occurs.
- E. Incorrect.
A Weighted routing policy in Amazon Route 53 spreads traffic based on assigned weights, not latency. This approach does not ensure that users are routed to the nearest region.