AWS Certified Cloud Practitioner (CLF-C02) — Question 335

A company has decided to adopt Amazon EC2 infrastructure and wants to scale various stateless services for short-term usage.

Which EC2 pricing model is MOST cost-efficient to meet these requirements?

Answer options

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

Correct answer: A

Explanation

Spot Instances are the most cost-effective option for stateless and fault-tolerant workloads because they allow you to utilize spare Amazon EC2 capacity at steep discounts. On-Demand Instances are more expensive and designed for continuous, uninterrupted workloads, while Reserved Instances require a long-term commitment of one or three years. Dedicated Hosts are physical servers reserved for a single customer, making them highly expensive and unsuitable for short-term, stateless scaling.