AWS Certified Cloud Practitioner

Explanation

Elasticity refers to the ability of a system to automatically scale computing resources up or down based on demand. This is a core cloud computing concept that allows applications to handle varying workloads efficiently.

Why C and D are FALSE:

• C. Diverting traffic across multiple regions: This is not elasticity - this describes Global Load Balancing or Geographic Distribution, which is about routing traffic to different geographic locations for performance, redundancy, or compliance reasons, not scaling based on demand.

• D. Diverting traffic to instances with higher capacity: This describes Load Balancing algorithms (like least connections, round robin, etc.), not elasticity. Elasticity is about adding/removing capacity, not just routing to existing capacity.

Why A and B are TRUE:

• A. Diverting traffic to instances based on the demand: This aligns with elasticity as it involves routing traffic to handle demand fluctuations.

• B. Diverting traffic to instances with the least load: This is a load balancing strategy that works with elasticity to distribute traffic efficiently across available resources.

Key Point: Elasticity specifically refers to the automatic provisioning and deprovisioning of resources (like adding/removing EC2 instances via Auto Scaling) to match demand, not just traffic routing strategies.