AWS Certified Cloud Practitioner (CLF-C02) — Question 646

What is the recommended use case for Amazon EC2 On-Demand Instances?

Answer options

• A. A steady-state workload that requires a particular EC2 instance configuration for a long period of time
• B. A workload that can be interrupted for a project that requires the lowest possible cost
• C. An unpredictable workload that does not require a long-term commitment
• D. A workload that is expected to run for longer than 1 year

Correct answer: C

Explanation

Amazon EC2 On-Demand Instances are ideal for short-term, unpredictable workloads that cannot be interrupted, as they require no long-term contracts or upfront payments. For steady-state or long-term workloads lasting over a year, Savings Plans or Reserved Instances offer better cost-efficiency. Spot Instances are best for interruptible workloads seeking the lowest possible cost.