AWS Certified DevOps Engineer – Professional (DOP-C02) — Question 185
A company has deployed a critical application in two AWS Regions. The application uses an Application Load Balancer (ALB) in both Regions. The company has Amazon Route 53 alias DNS records for both ALBs.
The company uses Amazon Route 53 Application Recovery Controller to ensure that the application can fail over between the two Regions. The Route 53 ARC configuration includes a routing control for both Regions. The company uses Route 53 ARC to perform quarterly disaster recovery (DR) tests.
During the most recent DR test, a DevOps engineer accidentally turned off both routing controls. The company needs to ensure that at least one routing control is turned on at all times.
Which solution will meet these requirements?
Answer options
- A. In Route 53 ARC, create a new assertion safety rule. Apply the assertion safety rule to the two routing controls. Configure the rule with the ATLEAST type with a threshold of 1.
- B. In Route 53 ARC, create a new gating safety rule. Apply the assertion safety rule to the two routing controls. Configure the rule with the OR type with a threshold of 1.
- C. In Route 53 ARC, create a new resource set. Configure the resource set with an AWS::Route53::HealthCheck resource type. Specify the ARNs of the two routing controls as the target resource. Create a new readiness check for the resource set.
- D. In Route 53 ARC, create a new resource set. Configure the resource set with an AWS::Route53RecoveryReadiness::DNSTargetResource resource type. Add the domain names of the two Route 53 alias DNS records as the target resource. Create a new readiness check for the resource set.
Correct answer: A
Explanation
The correct answer is A because creating an assertion safety rule with the ATLEAST type ensures that at least one of the routing controls must be enabled, thereby meeting the requirement. Options B and C do not adequately ensure that at least one routing control is always on, while option D focuses on DNS records rather than routing controls.