AWS Certified Solutions Architect Associate SAA-C03 Practice Question

The correct strategy to enhance fault tolerance is to extend the application across multiple geographically distinct datacenter locations provided by the cloud service, which are commonly known as Availability Zones. This ensures that even if one datacenter goes down, the others can continue to serve the application without interruption. Using a service designed to prevent DDoS attacks, like AWS Shield, does not address the issue of surviving datacenter downtime. Implementing across multiple regions is not necessary to address the single datacenter failure and can introduce unnecessary complexity and cost. Deploying within multiple networking segments such as VPCs in the same datacenter location does not provide protection against the failure of that datacenter.