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Difficulty: MediumIdentify design principles of the AWS Cloud

A retail business operates an e-commerce application on AWS. During peak shopping hours, the application requires 20 Amazon EC2 instances to handle the traffic, but during off-peak hours, only 4 instances are needed. The infrastructure team uses Amazon EC2 Auto Scaling to dynamically launch and terminate instances in response to the real-time load. Which AWS Cloud design principle is best illustrated by this scenario?

  1. A
    Loose coupling
  2. ElasticityAnswer
  3. C
    Scalability
  4. D
    Monolithic design

Answer

Elasticity
The design principle of elasticity focuses on matching resource allocation with actual demand. In this scenario, dynamically provisioning 20 instances during peak hours and scaling down to 4 instances during off-peak hours ensures the system is cost-effective and performs well without over-provisioning.

Step-by-Step Solution

1
Analyze the scenario details.
The scenario describes a system that automatically adds resources (scaling up to 20 instances) when demand is high and removes them (scaling down to 4 instances) when demand is low.
To identify the specific cloud behavior described.
2
Match the behavior to AWS cloud design principles.
The ability to dynamically scale resources both up and down to match demand is the definition of elasticity.
To select the correct design principle from the options.

Key Concept

Elasticity versus Scalability in cloud design principles
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Topics

Identify design principles of the AWS Cloud

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