AWS Certified Cloud Practitioner (CLF-C02) — Question 702

For which use case are Amazon EC2 On-Demand Instances MOST cost-effective?

Answer options

• A. Compute-intensive video transcoding that can be restarted if necessary
• B. An instance in continual use for 1 month to conduct quality assurance tests
• C. An instance that runs a web server that will run for 1 year
• D. An instance that runs a database that will run for 3 years

Correct answer: B

Explanation

Amazon EC2 On-Demand Instances are ideal for short-term, uninterrupted workloads like a one-month testing phase because they require no long-term commitment. For long-term workloads lasting one to three years, Reserved Instances or Savings Plans offer much better rates. For workloads that can tolerate interruptions, Spot Instances would be the most cost-effective option rather than On-Demand.