AWS Certified Solutions Architect – Professional — Question 572

A company is running a legacy application on Amazon EC2 instances in multiple Availability Zones behind a software load balancer that runs on an active/standby set of EC2 instances. For disaster recovery, the company has created a warm standby version of the application environment that is deployed in another AWS
Region. The domain for the application uses a hosted zone from Amazon Route 53.
The company needs the application to use static IP addresses, even in the case of a failover event to the secondary Region. The company also requires the client's source IP address to be available for auditing purposes.
Which solution meets these requirements with the LEAST amount of operational overhead?

Answer options

• A. Replace the software load balancer with an AWS Application Load Balancer. Create an AWS Global Accelerator accelerator. Add an endpoint group for each Region. Configure Route 53 health checks. Add an alias record that points to the accelerator.
• B. Replace the software load balancer with an AWS Network Load Balancer. Create an AWS Global Accelerator accelerator. Add an endpoint group for each Region. Configure Route 53 health checks. Add a CNAME record that points to the DNS name of the accelerator.
• C. Replace the software load balancer with an AWS Application Load Balancer. Use AWS Global Accelerator to create two separate accelerators. Add an endpoint group for each Region. Configure Route 53 health checks. Add a record set that is configured for active-passive DNS failover. Point the record set to the DNS names of the two accelerators.
• D. Replace the software load balancer with an AWS Network Load Balancer. Use AWS Global Accelerator to create two separate accelerators. Add an endpoint group for each Region. Configure Route 53 health checks. Add a record set that is configured for weighted round-robin DNS failover. Point the record set to the DNS names of the two accelerators.

Correct answer: A

Explanation

AWS Global Accelerator provides two static IP addresses and preserves the client's original source IP address when routing to Application Load Balancers (ALBs). Managing a single accelerator with endpoint groups in both regions requires less operational overhead than deploying multiple accelerators. Using an ALB combined with a Route 53 Alias record pointing directly to the accelerator is the most efficient and integrated solution for this architecture.