AWS Certified Cloud Practitioner
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A company wants to run an application on Amazon EC2 instances. The application has short-term, irregular workloads that cannot be interrupted.
Which will be the MOST cost-effective pricing model for this workload?
Real Exam
Community
RRitesh
A
On-Demand Instances
B
Dedicated Instances
C
Reserved Instances
D
Savings Plans
Explanation:
Explanation
On-Demand Instances are the most cost-effective choice for this scenario because:
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Short-term workloads: On-Demand Instances are billed by the second with no long-term commitments, making them ideal for unpredictable, short-duration workloads
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Irregular patterns: When usage patterns are inconsistent and cannot be predicted, On-Demand pricing avoids the waste of paying for reserved capacity that goes unused
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Cannot be interrupted: Unlike Spot Instances (which are not listed here), On-Demand Instances provide guaranteed availability and cannot be interrupted by AWS
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No upfront costs: There are no upfront payments or long-term contracts required
Why other options are less suitable:
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Reserved Instances: Require 1-3 year commitments and are cost-effective only for predictable, steady-state workloads
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Savings Plans: Also require 1-3 year commitments for consistent usage patterns
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Dedicated Instances: Provide physical isolation but are more expensive and don't address the irregular workload pattern
For workloads that are short-term, irregular, and cannot tolerate interruption, On-Demand Instances provide the optimal balance of flexibility and cost-effectiveness.
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