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Difficulty: EasyHigh Availability, Scalability, and Elasticity

A company is planning its migration to Microsoft Azure and wants to understand the core cloud concepts before deploying services.

Which two statements correctly describe the characteristics of high availability and elasticity?

  1. High availability ensures that a system remains operational and accessible with minimal downtime.Answer
  2. Elasticity allows a system to automatically scale resources up or down to match dynamic demand.Answer
  3. C
    High availability is the process of restoring data from backups in a separate geographical region after a catastrophic regional outage.
  4. D
    Elasticity refers to manually upgrading the RAM and CPU of a single virtual machine to accommodate a permanent increase in workload.

Answer

High availability ensures that a system remains operational and accessible with minimal downtime, while elasticity allows a system to automatically scale resources up or down to match dynamic demand.
The correct statements describe high availability and elasticity. High availability ensures that applications remain operational and accessible with minimal downtime, typically using redundancy. Elasticity is the ability of cloud systems to automatically and dynamically adjust resources in response to changing demand.

Step-by-Step Solution

1
Analyze the definition of high availability.
High availability focuses on maximizing uptime and ensuring service availability through redundant components, rather than recovering from regional disasters.
This helps identify the statement regarding continuous uptime as correct, and rules out disaster recovery scenarios.
2
Analyze the definition of elasticity.
Elasticity is the automatic, dynamic scaling of resources based on immediate demand, rather than manual, permanent hardware upgrades.
This helps identify the statement regarding automatic resource scaling as correct, and rules out manual scaling configurations.

Key Concept

High availability ensures uptime and accessibility, whereas elasticity provides automatic scaling in response to dynamic demand.
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Topics

High Availability, Scalability, and Elasticity

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