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Difficulty: EasyAWS Pricing Models

A company needs to run a temporary test environment on Amazon EC2 for a software demonstration that will last exactly four hours. The application cannot tolerate any interruptions during the demonstration. Which Amazon EC2 pricing model is the most cost-effective and appropriate for this workload?

  1. A
    Spot Instances
  2. B
    Reserved Instances
  3. On-Demand InstancesAnswer
  4. D
    Dedicated Hosts

Answer

On-Demand Instances represent the most cost-effective and appropriate option because they allow the company to pay for compute capacity by the second or hour with no long-term commitment, ensuring the four-hour workload runs without interruption.
On-Demand Instances allow users to pay for compute capacity by the hour or second with no long-term commitment. This model is perfect for short-term, low-cost workloads that require continuous uptime and cannot tolerate interruptions.

Step-by-Step Solution

1
Analyze the workload requirements from the scenario.
The workload is short-term (four hours) and requires absolute reliability with no interruptions.
Identifying these key constraints helps eliminate pricing models that require long-term commitment or involve interruption risk.
2
Evaluate the suitability of each EC2 pricing option against the requirements.
Reserved Instances require long-term contracts, Spot Instances can be interrupted, and Dedicated Hosts are for physical server isolation. On-Demand provides the necessary short-term flexibility and reliability.
Matching characteristics to AWS EC2 pricing models identifies the model that satisfies all conditions at the lowest cost.

Key Concept

AWS EC2 Pricing Models Selection
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Topics

AWS Pricing Models

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