Q19 — AWS SOA-C02 Ch.1
Question 19 of 100 | ← Chapter 1
A global gaming company is preparing to launch a new game on AWS. The game runs in multiple AWS Regions on a fleet of Amazon EC2 instances. The instances are in an Auto Scaling group behind an Application Load Balancer (ALB) in each Region. The company plans to use Amazon Route 53 for DNS services. The DNS configuration must direct users to the Region that is closest to them and must provide automated failover. Which combination of steps should a SysOps administrator take to configure Route 53 to meet these requirements? (Choose two.)
- A. Create Amazon CloudWatch alarms that monitor the health of the ALB in each Region. Configure Route 53 DNS failover by using a health check that monitors the alarms. ✓
- B. Create Amazon CloudWatch alarms that monitor the health of the EC2 instances in each Region. Configure Route 53 DNS failover by using a health check that monitors the alarms.
- C. Configure Route 53 DNS failover by using a health check that monitors the private IP address of an EC2 instance in each Region.
- D. Configure Route 53 geoproximity routing. Specify the Regions that are used for the infrastructure. ✓
- E. Configure Route 53 simple routing. Specify the continent, country, and state or province that are used for the infrastructure.
Correct Answer: A. Create Amazon CloudWatch alarms that monitor the health of the ALB in each Region. Configure Route 53 DNS failover by using a health check that monitors the alarms., D. Configure Route 53 geoproximity routing. Specify the Regions that are used for the infrastructure.
Explanation
Route 53的配置需满足就近路由与自动故障转移。地理邻近路由(geoproximity routing)可直接根据用户和资源的物理位置分配流量(选项D)。故障转移需结合健康检查,通过CloudWatch警报监控ALB健康状态更合理,因ALB作为前端服务,其健康状态直接影响用户访问(选项A)。直接监控EC2实例(选项B、C)或简单路由策略(选项E)无法对应题目需求。AWS文档指出,地理邻近路由支持基于位置的流量分配,且Route 53健康检查可与CloudWatch警报绑定实现故障转移。