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Identify types of cloud models

By Max from AzureGuru
Published in AZ-900 Training
October 06, 2020
2 min read

What is a public cloud?

In public clouds the cloud resources (like servers and storage) are owned and operated by a third-party cloud service provider and delivered over the Internet. With a public cloud, all hardware, software and other supporting infrastructure is owned and managed by the cloud provider. In a public cloud, you share the same hardware, storage and network devices with other organizations or cloud “tenants”.

Advantages

  • High scalability/agility – you don’t have to buy a new server in order to scale
  • Pay-as-you-go pricing – you pay only for what you use, no CapEx costs
  • You’re not responsible for maintenance or updates of the hardware
  • Minimal technical knowledge to set up and use - you can leverage the skills and expertise of the cloud provider to ensure workloads are secure, safe, and highly available

Disadvantages

  • There may be specific security requirements that cannot be met by using public cloud
  • There may be government policies, industry standards, or legal requirements which public clouds cannot meet
  • You don’t own the hardware or services and cannot manage them as you may want to
  • Unique business requirements, such as having to maintain a legacy application might be hard to meet

What is a private cloud?

A private cloud consists of computing resources used exclusively by one business or organization. The private cloud can be physically located at your organization’s on-site datacenter or it can be hosted by a third-party service provider. But in a private cloud, the services and infrastructure are always maintained on a private network and the hardware and software are dedicated solely to your organization.

Advantages

  • You can ensure the configuration can support any scenario or legacy application
  • You have control (and responsibility) over security
  • Private clouds can meet strict security, compliance, or legal requirements

Disadvantages

  • You have some initial CapEx costs and must purchase the hardware for startup and maintenance
  • Owning the equipment limits the agility - to scale you must buy, install, and setup new hardware
  • Private clouds require IT skills and expertise that’s hard to come by

What is a hybrid cloud?

In a hybrid cloud, data and applications can move between private and public clouds for greater flexibility and more deployment options. For instance, you can use the public cloud for high-volume, lower-security needs such as web-based email and the private cloud (or other on-premises infrastructure) for sensitive, business-critical operations like financial reporting.

Advantages

  • You can keep any systems running and accessible that use out-of-date hardware or an out-of-date operating system
  • You have flexibility with what you run locally versus in the cloud
  • You can take advantage of economies of scale from public cloud providers for services and resources where it’s cheaper, and then supplement with your own equipment when it’s not
  • You can use your own equipment to meet security, compliance, or legacy scenarios where you need to completely control the environment

Disadvantages

  • It can be more expensive than selecting one deployment model since it involves some CapEx cost up front
  • It can be more complicated to set up and manage

References:

  • Distinguish types of cloud models
  • Cloud deployment models

Tags

AZ-900Cloud Concepts

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