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Recent Posts

  • Terminologies of the cloud: High Availability, Fault Tolerance, Disaster Recovery, Scalability, Elasticity, and Agility

High Availability

  • If hardware fails, you can get a new, exact copy of it in very little time
  • Use clusters (a group of virtual machines) to ensure high availability

Fault Tolerance

  • Fault tolerance is part of the resilience of cloud computing
  • Zero Down-Time –  if one component fails, a backup component takes its place

Disaster Recovery

  • Plan to recover critical business systems:
    • Recovery Time Objective (RTO) is the time it takes after a disruption to restore business process to its service level
    • Recovery Point Objective (RPO) is the acceptable amount of data loss measured in time before the disaster occurs
  • Services for backup and disaster recovery:
    • Azure Backup – simplify data protection while saving costs
    • Azure Site Recovery keep your business running with disaster recovery service
    • Azure Archive Storage – store rarely used data in the cloud


  • You may increase or decrease the resources and services used at any given time, depending on the demand or workload.
    • Vertical Scaling – adding resources to increase the power of an existing server
    • Horizontal Scalingadding more servers that function together as one unit
  • Use scale sets for critical scenarios


  • Quickly expand or decrease computing resources
  • Automatically allocates more computing resources to handle the increased traffic. When the traffic begins to normalize, the cloud automatically de-allocates the additional resources to minimize cost


  • The ability to design, test, and launch software applications quickly that stimulate business growth.
  • Cloud agility enables companies to concentrate on other concerns such as security, monitoring, and analysis, instead of provisioning and maintaining the resources.

Validate Your Knowledge

Question 1

Question Type: Multiple-choice

Your company plans on migrating its application named TDojoApp1 to Azure.

TDojoApp1 has a high usage during the first and third weeks of the month and low usage during the 2nd and 4th weeks.

Which benefit of Azure Cloud Services supports cost management for this type of usage pattern?

  1. Load balancing
  2. Elasticity
  3. High availability
  4. Fault tolerance

Correct Answer: 2

Elasticity refers to the ability to automatically or dynamically increase or decrease resources as needed. Elastic resources match the current needs, and resources are added or removed automatically to meet future needs when it’s needed (and from the most advantageous geographic location). A distinction between scalability and elasticity is that elasticity is done automatically.

With cloud elasticity, a company avoids paying for unused capacity or idle resources and doesn’t have to worry about investing in the purchase or maintenance of additional resources and equipment.

Hence, the correct answer is: Elasticity.

Fault Tolerance is incorrect because this refers to the ability to remain up and running even in the event of a component (or service) no longer functioning. Typically, redundancy is built into cloud services architecture, so if one component fails, a backup component takes its place. This type of service is said to be tolerant of faults.

High Availability is incorrect because this refers to the ability to keep services up and running for long periods of time, with very little downtime, depending on the service in question.

Load balancing is incorrect because this refers to evenly distributing load (incoming network traffic) across a group of backend resources or servers.


What is Cloud Computing?

Note: This question was extracted from our AZ-900 Microsoft Azure Fundamentals Practice Exams.

For more Azure practice exam questions with detailed explanations, check out the Tutorials Dojo Portal:

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