AWS Certified Cloud Practitioner (CLF-C02) — Question 434

A company has batch workloads that need to run for short periods of time on Amazon EC2. The workloads can handle interruptions and can start again from where they ended.

What is the MOST cost-effective EC2 instance purchasing option to meet these requirements?

Answer options

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

Correct answer: B

Explanation

Spot Instances are the most cost-effective option for workloads that can tolerate interruptions, offering up to a 90% discount compared to On-Demand pricing. Reserved Instances require long-term commitments, while On-Demand and Dedicated Instances are significantly more expensive and unnecessary for fault-tolerant batch workloads.