Câu 31: AWS DevOps Engineer - Professional (DOP-C01) (Old)

A company has built a web service that runs on Amazon EC2 instances behind an Application Load Balancer (ALB). The company has deployed the application in us-east-1. Amazon Route 53 provides an external DNS that routes traffic from example.com to the application, created with appropriate health checks. The company has deployed a second environment for the application in eu-west-1. The company wants traffic to be routed to whichever environment results in the best response time for each user. If there is an outage in one Region, traffic should be directed to the other environment. Which configuration will achieve these requirements?

1. A. ✑ A subdomain us.example.com with weighted routing: the US ALB with weight 2 and the EU ALB with weight 1.
2. B. ✑ A subdomain us.example.com with latency-based routing: the US ALB as the first target and the EU ALB as the second target.
3. C. ✑ A subdomain us.example.com with failover routing: the US ALB as primary and the EU ALB as secondary. — đáp án hiện tại
4. D. ✑ A subdomain us.example.com with multivalue answer routing: the US ALB first and the EU ALB second.