## 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)
				- Scalability refers to the ability to adjust resources to meet demand
				- **vertical**
					- increasing or decreasing the capabilities of resources (i.e. RAM or CPU)
				- **horizontal**
					- adding or subtracting the number of resources (i.e. VMs or containers)
			- each Service has own SLA
		- Describe the benefits of reliability and predictability in the cloud.
			- **Reliability** is the ability of a system to recover from failures and continue to function
				- decentralized design and global scale across data centers
			- **Predictability**
				- **performance** predictability
					- Autoscaling, load balancing, and high availability
				- **cost** predictability
					- track cost in real time
					- Total Cost of Ownership (TCO) or Pricing Calculator
		- Describe the benefits of **security** and **governance** in the cloud.
			- Set templates
			- update all your deployed resources to new standards
			- Cloud-based auditing
			- handle distributed denial of service (DDoS)
		- Describe the benefits of **manageability** in the cloud.
			- Automatically scale resource
			- Deploy resources based on (preconfigured) templates
			- Monitor health and replace failing resources
			- Automatic alerts
			- Use
				- Web Portal, CLI, APIs, PowerShell
	- ###Describe cloud service types
		- Describe Infrastructure as a Service (IaaS).
			- renting the hardware in a cloud datacenter (i.e. Hetzner)
			- **Scenarios**
				- Lift-and-shift migration
				- Test an development
		- Describe Platform as a Service (PaaS).
			- maintain the operating systems, databases, and development tools
			- **Scenarios**
				- Development framework
				- Analytics or business intelligence
		- Describe Software as a Service (SaaS).
			- Use Maintained Software
			- **Scenarios**
				- Email and messaging.
				- Business productivity applications.
				- Finance and expense tracking.
		- Identify appropriate use cases for each cloud service (IaaS, PaaS, SaaS).