AWS Certified Cloud Practitioner — Question 583

A company has an application workload that is stateless by design and can sustain occasional downtime. The application performs massively parallel computations.

Which Amazon EC2 pricing model should the company choose for its application to reduce cost?

Answer options

• A. On-Demand Instances
• B. Spot Instances
• C. Reserved Instances
• D. Dedicated Instances

Correct answer: B

Explanation

Spot Instances are ideal for stateless, fault-tolerant workloads like parallel computations because they offer spare EC2 capacity at up to a 90% discount. On-Demand and Reserved Instances are less cost-effective for workloads that can tolerate interruptions, as they are designed for continuous or unpredictable workloads without downtime. Dedicated Instances are meant for specific licensing and regulatory requirements and would significantly increase costs.