- Test Content
	- | **AZ-900 Domain Area** | **Weight** |
	  | ---- | ---- | ---- |
	  | Describe cloud concepts | 25-30% |
	  | Describe Azure architecture and services | 35-40% |
	  | Describe Azure management and governance | 30-35% |
- ### Introduction to cloud computing
	- Define cloud computing.
		- Compute Power
		- Storage
		- Pay only ressources you use
		- Upkeep is done by cloud provider
	- Describe the shared responsibility model.
		- Cloud Provider: Physical security, power, cooling, and network connectivity are the responsibility
		- Consumer: responsible for the data and information stored in the cloud.
		- IAAS (Infrastructure)-> PAAS (Platform) -> SAAS (Software)
		- ![Diagram showing the responsibilities of the shared responsibility model.](https://learn.microsoft.com/en-us/training/wwl-azure/describe-cloud-compute/media/shared-responsibility-b3829bfe.svg){:height 231, :width 700}
	- Define cloud models, including public, private, and hybrid.
		- | **Public cloud** | **Private cloud** | **Hybrid cloud** |
		  | ---- | ---- | ---- |
		  | No capital expenditures to scale up | Organizations have complete control over resources and security | Provides the most flexibility |
		  | Applications can be quickly provisioned and deprovisioned | Data is not collocated with other organizations’ data | Organizations determine where to run their applications |
		  | Organizations pay only for what they use | Hardware must be purchased for startup and maintenance | Organizations control security, compliance, or legal requirements |
		  | Organizations don’t have complete control over resources and security | Organizations are responsible for hardware maintenance and updates |  |
		- Azure ARC
			- Manage Cloud environment
	- Identify appropriate use cases for each cloud model.
	- Describe the consumption-based model.
		- Capital expenditure (CapEx)
			- upfront one time expenditure
		- Operational expenditure (OpEx)
			- spending money on services or products over time
			- Cloud computing is here
	- Compare cloud pricing models.
		- pay-as-you-go pricing model
- ### Describe the benefits of using cloud services
	- Describe the benefits of high availability and scalability in the cloud.
		- uptime (or availability)
		- demand (or scale)
		- each Service has own SLA
	- Describe the benefits of reliability and predictability in the cloud.
	- Describe the benefits of security and governance in the cloud.
	- Describe the benefits of manageability in the cloud.