SAP-C02 Question 136
Single answerA company needs to run a mission-critical application on Amazon EC2 instances with consistent, predictable performance. The application has a steady workload and is expected to run 24/7 for at least one year. The company also wants to optimize costs while ensuring high availability. Which purchasing option should the company choose?
- A
On-Demand Instances
- B
Spot Instances
- C
Savings Plans
- D
Reserved Instances
Show answer and explanation
Correct answer: D
Explanation
For a mission-critical application with a steady, predictable workload that needs to run 24/7, Reserved Instances are the best option. They provide the cost optimization the company is looking for while ensuring the required compute capacity is available. Other options such as On-Demand or Spot Instances are either too expensive or unreliable for this use case, and Savings Plans do not directly tie to specific instance reservations.
- A. Incorrect.
On-Demand Instances are the most flexible but also the most expensive option. They are better suited for short-term, unpredictable workloads rather than steady, predictable workloads.
- B. Incorrect.
Spot Instances are highly cost-effective but are not suitable for mission-critical applications as they can be interrupted by AWS with short notice.
- C. Incorrect.
Savings Plans provide cost savings based on a commitment to a specific dollar amount of usage per hour, but they do not guarantee the allocation of a specific instance type or availability.
- D. Correct.
Reserved Instances are ideal for long-term, predictable workloads as they offer a significant cost discount (up to 75%) in exchange for a one- or three-year commitment and are designed for steady-state usage.