AZ 900
What is cloud computing?
the delivery of computing services over the internet by using a pay-as-you-go pricing model
when using a cloud provider, you'll always be responsible for:
- the information and data stored in the cloud
- devices that are allowed to connect to your cloud (cell phones, computers, and so on)
- the accounts and identities of the people, services, and devices within your organizatiom
the cloud provider is always responsible for
the physical datacenter
the physical network
the physical hosts
what are three main cloud models?
private
public
hybrid
what is a private cloud?
cloud (delivering IT services over the internet) that's used by a single entity
comes with greater cost and fewer benefits of a public cloud deployment
may be hosted from your onsite datacenter
what is a public cloud?
built, controlled, and maintained by a third-party cloud provider
general public availability
what is a hybrid cloud?
a computing environment that uses both public and private clouds in an inter-connected environment
can be used tonallow a private cloud to surge for increased, temporary demand by deploying public cloud resources
can be used to provide an extra layer of security
what is a multi-cloud?
using multiple public cloud providers
you deal with two or more cloud providers and manage resources and security in both environments
what is azure arc?
a set of technologies that helps manage your cloud environment
what is capital expenditure (CapEx)?
typically a one-time, up-front expenditure to purchase or secure tangible resources
example: new building, building a datacenter
what is operating expenditures (OpEx)?
spending money on services or products over time.
leasing a company car, signing up for cloud services
is cloud computing a capital or operating expenditure?
operating because it operates on a consumption-based model. you don't pay for the physical infrastructure, the electricity, the security, or anything else associated with maintaining a datacenter. instead you pay for the IT resources you use.
which cloud model uses some datacenters focused on providing cloud services to anyone that wants them, and some data centers that are focused on a single customer?
hybrid cloud
according to the shared responsibility model, which cloud service type places the most responsibility on the customer?
infrastructure as a service (IaaS)
what does high availability focus on?
ensuring maximum availability, regardless of disruptions or events that may occur
what is scalability?
the ability to adjust resources to meet demand
what are two types of scalability?
vertical and horizontal
what is vertical scaling?
focused on increasing or decreasing the capabilities of resources
what is horizontal scaling?
adding or substracting the number of resources
what is reliability?
the ability of a system to recover from failures and continue to function
what are two types of predictability?
performance and cost
what is performance predictability?
focuses on predicting the resources needed to deliver a positive experience for your customers.
autoscaling, load balancing, and high availability are just some of the cloud concepts that support it
what is cost predictability?
focused on predicting or forecasting the cost od the cloud spend
what is infrastructure as a service?
the cloud provider is responsible for maintaining the hardware, network connectivity (to the internet), and physical security. you're responsible for everything else: operating system installation, configuration, amd maintenance; network configuration; database and storage configuration; and so on.
essentially, you're renting the hardware in a cloud database, but what you do with that hardware is up to you
what is a platform as a service (IaaS)?
the cloud provider maintains the physical infrastructure, physical security, and connection to the internet. they also maintain the operating systems, middleware, development tools, and business intelligence services that make up a cloud solution
what is software as a service (SaaS)?
the model that places the most responsibility with the cloud provider and the least responsibility with the user.
you're responsible for the data that you put in the system, the devices that younallow to connect to the system, and the users that have access.
you're essentially renting or using a fully developed application. email, financial software, messaging applications, and connectivity software are all common examples
which cloud service type is most suited to a lift and shift migration from an on-premise datacentee to a cloud deployment?
infrastructure as a service
what type of cloud service type would a Finance and Expense tracking solution typically be in?
software as a service
describe Azure virtual machines (VM)
you can create and use VMs in the cloud
VMs provide infrastructure as a service (IaaS) in the formof a virtualized server and can b used in many ways.
gives you the flexibility of virtualization without having to buy and maintain the physical hardware tat runs the VM. however, in a IaaS offering, you still need to configure, update, and maintain the software that runs on the VM
what is virtual machine scale sets?
lets you create and manage a group of identical load-balanced VM.
scale sets allow you to centrally manage, configure, and update a large number of VMs in minutes
also automatically deploy a load balancer to make sure that your resources are being used efficiently.
you can build large-scale services for areas such as compute, big data, amd container workloads
what is virtual machine availability sets?
another tool to help you build a more resilient, high availability environment.
designed to ensure that VMs stagger updates and have varied power and network connectivity, preventing you from losing all your VMs with a single network or power failure.