AWS Certified Cloud Practitioner
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A company needs to use Amazon EC2 instances to conduct quality assurance tests. The EC2 instances must run continuously without interruption for 1 month. After 1 month, the company will not need the EC2 instances anymore.
Which EC2 instance purchasing option will meet these requirements most cost-effectively?
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Community
RRitesh
A
Dedicated Hosts
B
On-Demand Instances
C
Reserved Instances
D
Spot Instances
Explanation:
Explanation
On-Demand Instances are the most cost-effective choice for this scenario because:
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Short-term usage: The company only needs the instances for 1 month, which is too short for Reserved Instances (which typically require 1-3 year commitments)
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Continuous operation: The instances must run without interruption, which makes Spot Instances unsuitable (they can be terminated when AWS needs capacity)
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No long-term commitment: On-Demand instances don't require upfront payments or long-term contracts
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Cost-effectiveness: For short-term, continuous workloads, On-Demand provides the best balance of reliability and cost without the overhead of Reserved Instances
Why other options are less suitable:
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Dedicated Hosts: More expensive and typically used for compliance requirements or software licensing
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Reserved Instances: Require 1-3 year commitments, which is unnecessary for a 1-month project
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Spot Instances: Can be interrupted, which violates the requirement for continuous operation without interruption
The interface correctly highlights "On-Demand Instances" as the selected answer based on the scenario of short-term, continuous usage with no long-term commitment.
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