AWS Certified Cloud Practitioner
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A company runs a reporting application on Amazon EC2 instances. The application runs once every week and once again at the end of every month. The EC2 instances can be stopped when they are not in use.
Which EC2 instance purchasing option will meet these requirements MOST cost-effectively?
Real Exam
Community
RRitesh
A
Standard Reserved Instances
B
Convertible Reserved Instances
C
On-Demand Capacity Reservations
D
On-Demand Instances
Explanation:
Explanation
On-Demand Instances are the most cost-effective option for this scenario because:
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Usage Pattern: The application runs only once per week and once at month-end, which means the instances are used infrequently and irregularly
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Flexibility: On-Demand Instances allow you to start and stop instances as needed without long-term commitments
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Cost Efficiency:
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Reserved Instances (Standard or Convertible) require 1-3 year commitments and are cost-effective only for steady-state, predictable workloads
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On-Demand Capacity Reservations reserve capacity but still charge for the entire reservation period, making them expensive for intermittent use
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On-Demand Instances charge only for actual compute time used, which aligns perfectly with this intermittent usage pattern
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Key Points:
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When instances can be stopped when not in use, On-Demand pricing provides the best value for irregular workloads
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Reserved Instances are designed for consistent, predictable usage over long periods
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The ability to stop instances eliminates the need for capacity reservations or long-term commitments
This approach minimizes costs while maintaining the required flexibility for the reporting schedule.
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