Q22 — AWS SAA-C03 Ch.2

Question 22 of 65 | ← Chapter 2

Q87. A company needs to meet a strict service level agreement (SLA) with its users for application availability. The primary application stack is hosted in the us-east-1 Region and a replica of the stack is in us-west-2 for disaster recovery. The company requires that no user traffic be served by the application stack in us-west-2 unless there is an issue with the application stack in us-east-1. What should a solutions architect do to meet the company's needs without manual intervention?

Correct Answer: C. Configure a failover routing policy in Amazon Route 53. Set us-east-1as the primary and us-west-2 as the secondary.

Explanation

The correct answer is C. Configure a failover routing policy in Amazon Route 53. Set us-east-1 as the primary and us-west-2 as the secondary. To meet the company's needs, a failover routing policy can be used in Amazon Route 53. The primary application stack in us-east-1 will handle all user traffic under normal conditions. If there is an issue with the application stack in us-east-1, Route 53 will automatically redirect traffic to the replica stack in us-west-2. Option A, a weighted routing policy with the weight of us-east-1 set to 100 and us-west-2 set to 0, would always direct traffic to us-east-1 regardless of the availability of that region. Option B, a weighted routing policy with the weight of us-west-2 set to 50 and us-east-1 set to 50, would result in both regions receiving traffic at all times, which could put additional load on the systems and increase costs. Option D, setting us-west-2 as the primary and us-east-1 as the secondary, would cause user traffic to be served by the us-west-2 region instead of the primary region unless there was an issue with the us-west-2 region. This does not meet the requirement of the company to have the us-east-1 region serve all user traffic under normal conditions.