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Azure Cloud Service Models

  • The three cloud computing service models are IaaS, PaaS, and SaaS.
  • You can also use serverless computing to eliminate the need to manage infrastructure.
  • The shared responsibility model determines the security tasks that are handled by the cloud provider and handled by the customer.
    • Azure is responsible for protecting the infrastructure such as hosts, network, and data center.
    • The customer is responsible for protecting their data, endpoints, account, and access management.
  • IaaS, PaaS, and SaaS have different levels of managed services:

azure cloud service models

Infrastructure as a service (IaaS)

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  • Most user management
  • You are responsible for managing the operating systems, data, and applications.
  • IaaS helps you to extend resources rapidly to meet the spikes required for your application.
  • Used in the following scenarios:
    • Migrating workloads – move existing applications to the cloud.
    • Test and development – quickly set up and dismantle test and development environments. IaaS makes scaling development and testing environments, fast and economical.
    • Storage, backup, and recovery – simplify the planning and management of backup and recovery systems.
    • Website hosting – less expensive than traditional web hosting.
    • High-performance computing (HPC) – clusters of computers that help solve complex problems involving millions of variables or calculations.
    • Big data analysis – for massive data sets that require a huge amount of processing power.

Platform as a service (PaaS)

  • Less user management
  • The operating systems are managed by the cloud provider, while the user is responsible for the applications and data they run and store.
  • PaaS offers all the functionality you need to support the entire lifecycle of web applications: building, testing the application, deploying the source code, managing, and updating within the same integrated environment.
  • Used in the following scenarios:
    • Development framework a framework for creating or customizing cloud-based applications.
    • Analytics or business intelligence – find insights and patterns, and predict outcomes to improve business decisions.

Software as a service (SaaS)

  • Least amount of management
  • The cloud provider is responsible for managing everything, and the end-user just uses the software.

Serverless Computing

  • Function as a Service (FaaS)
  • You simply deploy the code with a serverless platform, and it runs at high availability.
  • Dynamically scales up and down to meet the demands of each workload within seconds.
  • A pay-per-execution model that charges sub-second billing only for the time and resources required to execute the code.

Validate Your Knowledge

Question 1

Question Type: Multiple-choice

In the Azure Shared Responsibility Model, whose responsibility is it to patch the operating system of an Azure App Service?

  1. Azure
  2. Customer
  3. Both Azure and the customer
  4. Neither Azure nor the customer

Correct Answer: 1

Capital Expenditures or CapEx is defined as funds used by organizations to obtain, upgrade, and maintain physical assets such as data centers. These expenditures are generally nonrecurring and result in the acquisition of permanent assets.

Azure Reserved Instances is an example of a CapEx model.

Operating Expenditures or OpEx is defined as funds that are used by organizations for their day-to-day operations. Think of OpEx as your electricity and water bill. The more you use, the higher the charges.

Azure on-demand or pay-as-you-go is an example of an OpEx model.

Therefore, the following statements are true:

  • Capital expenditures generate benefits over a long period. These expenditures are generally nonrecurring and result in the acquisition of permanent assets.
  • Operating expenditures are ongoing costs of doing business. Consuming cloud services in a pay-as-you-go model could qualify as an operating expenditure

The statement that says: Two virtual machines that use D2d v4 instance will always be billed the same monthly costs is incorrect because despite having the same instance type, they may differ on the following specifications: type of OS, region location of each virtual machine, and storage size, type, and transaction. These must always be specified when creating a virtual machine.


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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