Microsoft Azure Fundamentals AZ-900 Exam Preparation- Describe Cloud Concepts

What is cloud computing? A concept of computing where processing and storage are performed elsewhere over a network connection rather than locally. Why is Cloud Computing typically cheaper to use? Instead of maintaining CPUs and storage in your datacentre, you rent them for the time that you need them (on a pay as you go model). The cloud provider takes care of maintaining the underlying infrastructure for you. -lower your operating costs. -Run your infrastructure more efficiently. -Scale as your business needs change. Why should I move to the cloud? To power your services and deliver innovative and novel user experiences more quickly, the cloud provides on-demand access to: -A nearly limitless pool of raw compute, storage, and networking components. -Speech recognition and other cognitive services that help make your application stand out from the crowd. -Analytics services that deliver telemetry data from your software and devices. What are some cloud computing advantages? -Reliability -Scalability -Vertically -Horizontally -Elasticity -Agility -Geo-distribution -Disaster recovery Reliability Depending on the service-level agreement that you choose, your cloud-based applications can provide a continuous user experience with no apparent downtime even when things go wrong. Scalability Applications in the cloud can be scaled in two ways, while taking advantage of autoscaling. -Vertically: Computing capacity can be increased by adding RAM or CPUs to a virtual machine -Horizontally: Computing capacity can be increased by adding instances of a resource, such as adding more virtual machines to your configurations Elasticity cloud-based applications can be configured to always have the resources they need. Agility Cloud-based resources can be deployed and configured quickly as your application requirements change. Geo Distribution Applications and data can be deployed to regional data centres around the globe, so your customers always have the best performance in their region. Disaster Recovery By taking advantage of cloud-based backup services, data replication, and geo-distribution, you can deploy your applications with the confidence that comes form knowing that your data is safe in the event that disaster should occur. What are cloud service models? -infrastructure as a service (IaaS) -platform as a service (PaaS), -software as a service (SaaS) IaaS (Infrastructure as a Service) A service model in which hardware services are provided virtually, including network infrastructure devices such as virtual servers. A cloud provider keeps the hardware up to date, but operating system maintenance and network configuration is left to the cloud tenant. PaaS (Platform as a Service) This cloud service model is a managed hosting environment. The cloud provider manages the virtual machines and networking resources, and the cloud tenant deploys their applications into the managed hosting environment. SaaS (Software as a Service) In this cloud service model, the cloud provider manages all aspects of the application environment, such as virtual machines, networking resources, data storage, and applications. The cloud tenant only needs to provide their data to the application managed by the cloud provider. What is severless computing? Serverless architectures are highly scalable and event-driven. They use resources only when a specific function or trigger occurs. In understanding the definition of serverless computing, it's important to note that servers are still running the code. The serverless name comes from the fact that the tasks associated with infrastructure provisioning and management are invisible to the developer. Public Cloud Services are offered over the public internet and available to anyone who wants to purchase them. Cloud resources like servers and storage are owned and operated by a third-party cloud service provider and delivered over the internet. Private Cloud Computing resources are used exclusively by users from one business or organization. A private cloud can be physically located at your organization's on-site datacentre. It also can be hosted by a third-party service provider.