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Difficulty: EasyHigh Availability, Scalability, and Elasticity

A company operates an online retail store that experiences sudden, temporary spikes in traffic during promotional events. The company wants to ensure that additional virtual machines are automatically created to handle the increased load, and then automatically removed when traffic returns to normal levels to minimize operational costs. Which cloud concept does this scenario describe?

  1. A
    High Availability
  2. ElasticityAnswer
  3. C
    Scalability
  4. D
    Disaster Recovery

Answer

Elasticity
The correct answer is elasticity because it describes the ability of cloud systems to dynamically provision and deprovision computing resources automatically in response to changing workloads, ensuring the company only pays for the resources it actively uses.

Step-by-Step Solution

1
Analyze the scenario requirements: the application needs to automatically add virtual machines during load spikes and automatically remove them when traffic declines to control costs.
Identify that the system requires dynamic, automated allocation and deallocation of resources based on demand.
This distinguishes simple scaling (which can be manual or one-directional) from dynamic, bi-directional auto-scaling.
2
Evaluate the candidate cloud concepts (scalability, elasticity, high availability, disaster recovery) against this dynamic auto-scaling requirement.
Determine that elasticity is the specific cloud characteristic that defines automatic, demand-based scaling up and down to match workload demands.
Correctly identifying the term matching the scenario's cost-efficiency and automation needs leads to elasticity.

Key Concept

Elasticity is the ability of a system to dynamically allocate and deallocate resources automatically in response to real-time fluctuations in demand.
Estimated Time:1m 0s
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Topics

High Availability, Scalability, and Elasticity

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