Your company has to react quickly when cloud services have to rapidly allocate and deallocate resources. These resources need to be provided on demand via self-service so that vast amounts of computing resources can be provisioned in minutes. There will be no manual intervention in provisioning or deprovisioning services. Which cloud feature is needed in this scenario?
A) Economy of scale
B) Fault tolerance
C) High availability
D) Agility
E) Elasticity
F) Disaster recovery
G) Scalability
Explanation
You would choose agility. Agility is the ability to react quickly. Cloud services can allocate and deallocate resources quickly. These are on-demand services that are provisioned in minutes. There is no manual intervention in provisioning or deprovisioning services.
You would not choose elasticity. This feature increases or decreases resources as needed, but unlike scalability, elasticity is done automatically. Elastic resources are based on the current needs and resources are added or removed dynamically to meet those needs, from the most advantageous geographic location. A distinction between scalability and elasticity is that elasticity is done automatically.
You would not choose high availability. This feature allows services to run for extended periods, with very little downtime, depending on the service.
You would not choose scalability. This feature can increase (scale-up) or decrease (scale-down) resources that are assigned to a workload. As demand increases, you can add additional resources or capabilities to manage the increase in demand (known as scaling up). Scalability does not have to be done automatically.
You would not choose fault tolerance. Fault tolerance is the ability to remain up and running in the event of a component or service that is no longer functioning. Typically, redundancy is built into cloud services architecture so that if one component fails, a backup component takes its place. This type of service is said to be tolerant of faults.
You would not choose disaster recovery. This feature allows you to recover from a cloud service outage caused by an event. Cloud services disaster recovery can happen very quickly with automation, with resources being readily available for use.
You would not choose economy of scale. The concept of economy of scale is the ability to do business cheaper and more efficiently when operating on a larger scale, in comparison to operating on a smaller scale.
Objective:
Cloud Computing Concepts
Sub-Objective:
Describe the benefits and considerations of using cloud services
References:
Sysfore Blog > Agility on Cloud – A Vital Part of Cloud Computing
TutorialsPoint > Microsoft Azure - Scalability
IBM Knowledge Center > High availability versus fault tolerance
YouTube Video > AZ900T01 M1L1 CloudServices Jan19
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