Q59 — AWS SAA-C03 Ch.14

Question 59 of 100 | ← Chapter 14

Q1059. A company's production environment consists of Amazon EC2 On-Demand Instances that run constantly between Monday and Saturday. The instances must run for only 12 hours on Sunday and cannot tolerate interruptions. The company wants to cost-optimize the production environment.Which solution will meet these requirements MOST cost-effectively?

Correct Answer: A. Purchase Scheduled Reserved Instances for the EC2 instances that run for only 12 hours on Sunday.Purchase Standard Reserved Instances for the EC2 instances that run constantly between Monday and Saturday.

Explanation

To cost-optimize the production environment while meeting the specified requirements, the best solution is:A. Purchase Scheduled Reserved Instances for the EC2 instances that run for only 12 hours on Sunday. Purchase Standard Reserved Instances for the EC2 instances that run constantly between Monday and Saturday.Explanation:\1. Scheduled Reserved Instances: - Scheduled Reserved Instances allow you to reserve capacity for specific time slots. Since the EC2 instances need to run for only 12 hours on Sunday, this option perfectly fits the requirement without running instances unnecessarily.\2. Standard Reserved Instances: - For the instances that run constantly between Monday and Saturday, purchasing Standard Reserved Instances provides significant cost savings compared to On-Demand pricing. This option ensures that these instances are always available and are cost-effective for long-term use.\3. No Interruptions: - Both Scheduled Reserved Instances and Standard Reserved Instances are designed for workloads that cannot tolerate interruptions, addressing the company’s need for reliability.Evaluation of Other Options:B. Purchase Convertible Reserved Instances for the EC2 instances that run for only 12 hours on Sunday: - While Convertible Reserved Instances offer flexibility to change instance types, they are not necessary for a short, fixed duration workload like the 12 hours on Sunday. Scheduled Reserved Instances are more appropriate and cost-effective for this need.C. Use Spot Instances for the EC2 instances that run for only 12 hours on Sunday: - Spot Instances can be interrupted, which does not meet the requirement of no interruptions for the Sunday workload. Therefore, this option is not suitable.D. Use Spot Instances for the EC2 instances that run for only 12 hours on Sunday: - Similar to option C, this approach does not align with the requirement for non-interruption, making it unsuitable.Conclusion:Option A offers the most cost-effective and reliable solution by utilizing both Scheduled and Standard Reserved Instances, ensuring the production environment meets operational needs without incurring unnecessary costs.