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Difficulty: MediumAWS Pricing Models

A logistics company is deploying a new package tracking system on Amazon EC2. The tracking service experiences sudden, unpredictable spikes in traffic when delivery fleets update their statuses. The instances handling these spikes must run continuously without interruption to prevent tracking delays, and the company cannot predict when these spikes will occur. Which Amazon EC2 pricing model is the most cost-effective and suitable choice to handle these traffic spikes?

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

Answer

On-Demand Instances
On-Demand Instances are the correct choice because they provide reliable, uninterrupted compute capacity on a pay-as-you-go basis with no upfront payments or long-term commitment. This perfectly aligns with the requirement to handle sudden, unpredictable spikes in traffic where tracking delays are unacceptable.

Step-by-Step Solution

1
Analyze the workload characteristics from the scenario.
The workload consists of sudden, unpredictable spikes in traffic that cannot tolerate interruptions and have no predictable schedule.
Understanding the availability and predictability requirements helps narrow down the appropriate EC2 pricing models.
2
Evaluate the suitability of Spot Instances.
Spot Instances can be reclaimed with a 2-minute notice, so they are not suitable for workloads requiring continuous, uninterrupted execution.
Since the package tracking system cannot tolerate interruptions, Spot Instances must be ruled out.
3
Evaluate the suitability of Reserved Instances.
Reserved Instances require a long-term commitment (1 or 3 years) for steady-state workloads, making them inefficient for short-term, unpredictable spikes.
Paying for reserved capacity for unpredictable spikes would result in idle resources and wasted costs.
4
Evaluate On-Demand Instances.
On-Demand Instances offer uninterrupted compute capacity with no long-term commitment, billing only for active usage.
This model matches both the unpredictability and the zero-interruption requirement of the spike workload, making it the most cost-effective and reliable choice.

Key Concept

AWS EC2 Pricing Models selection based on workload predictability and interruption tolerance
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Topics

AWS Pricing Models

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