ANS-C01 Question 159
Single answerYour organization runs a global e-commerce platform hosted on AWS, and you are tasked with improving site reliability and latency for users across different regions. The application is hosted in multiple AWS Regions and uses an Application Load Balancer (ALB) in each region. You are also required to ensure traffic is routed to the nearest region based on user location, with automatic failover to the next available region in case of a failure. Which AWS service and configuration should you implement to achieve this?
- A
Use Amazon CloudFront with origin failover configured to route traffic to the nearest ALB.
- B
Use AWS Global Accelerator to route traffic to the closest ALB and configure endpoint groups for failover.
- C
Configure Route 53 Latency-Based Routing with health checks to route traffic to the nearest ALB and failover to another region during outages.
- D
Use Elastic Load Balancing cross-region load balancing to distribute traffic between different ALBs across regions.
Show answer and explanation
Correct answer: C
Explanation
Route 53 Latency-Based Routing with health checks is the ideal solution here because it ensures that user traffic is routed to the ALB in the nearest AWS region based on latency. Additionally, Route 53 health checks allow you to monitor the health of resources and automatically failover to another region if the primary region becomes unhealthy. Other options like CloudFront and Global Accelerator provide performance optimizations but do not fully meet the requirements of routing traffic based on user location and handling regional failover specifically with ALBs.
- A. Incorrect.
Amazon CloudFront is not designed for routing traffic to the nearest ALB; instead, it is a content delivery network (CDN) primarily used for caching and delivering static and dynamic content. While you can use origin failover, it doesn't provide the level of control required for region-based routing or failover.
- B. Incorrect.
AWS Global Accelerator can direct traffic to the nearest endpoint based on network latency, but it is more suitable for improving global application performance with static IPs. It does not specifically integrate with ALBs for region-based routing with failover.
- C. Correct.
Route 53 Latency-Based Routing is the correct choice as it routes traffic to the region with the lowest latency (nearest region), and health checks ensure that traffic is rerouted to another healthy region during an outage. This is the most suitable solution for the given requirements.
- D. Incorrect.
Elastic Load Balancing cross-region load balancing is not a valid feature. ALBs are region-specific and cannot distribute traffic across regions. Cross-region routing must be handled using services such as Route 53 or Global Accelerator.