Describe Core Azure Concepts Flashcards
What is cloud computing?
Cloud computing is the delivery of computing services over the internet by using a pay as you go pricing model
What is the shared responsibility model?
The responsibility of IT maintenance is shared between the cloud provider and the consumer.
What is the consumer responsible for and what is the cloud provider responsible for in the shared responsibility model?
- The cloud provider is responsible for anything to do with the data center: Physical network, hosts and datacenter
- The consumer is responsible for the data and information stored in the cloud and for access security, meaning you only give access to those who need it.
What is a private cloud?
Private cloud is a cloud (delivering IT services over the internet) that’s used by a single entity. It is more secure and controlled but it is more expensive. A private cloud may be hosted from your on site datacenter. It may also be hosted in a dedicated datacenter offsite, potentially even by a third party that has dedicated that datacenter to your company.
What is a public cloud?
A public cloud is built, controlled, and maintained by a third-party cloud provider. With a public cloud, anyone that wants to purchase cloud services can access and use resources, it is available to be used by the general public.
What is a hybrid cloud?
Hybrid cloud is a computing environment that combines an on-premises datacentre (also called a private cloud) with a public cloud, allowing data and applications to be shared between them.
What is a multi cloud?
A multi cloud is where you have two or more public cloud providers as well as a private cloud and manage resources and security in both environments.
What does Azure Arc do?
Azure Arc can help manage your cloud environment, whether it’s a public cloud solely on Azure, a private cloud in your datacenter, a hybrid configuration, or even a multi-cloud environment running on multiple cloud providers at once.
What are the two types of expenses in a consumption based model?
Capital expenditure (CapEx) and Operational expenditure (OpEx).
Explain Capital Expenditure
CapEx is a one-time, up-front expenditure to purchase or secure tangible resources. Eg building a datacenter, or buying a company vehicle
Explain Operational expenditure
OpEx is spending money on services or products over time. Eg Renting a convention center, leasing a company vehicle, or signing up for cloud services.
Cloud computing is consumption-based OpEx because you pay for the IT resources you use, you don’t pay for the physical infrastructure.
List out the benefits of cloud computing (RAGEDs)
- Reliability - ability of a system to recover from failures and continue to function.
- High Availability - high availability ensures the maximum availability with no apparent downtime regardless of disruptions
- Geo-distribution - can be deployed to regional datacenters so that customers have best experience
- Elasticity - automatic scaling, when the system is able to allocate and deallocate resources dynamically
- Disaster recovery - application data is safe in the event of a disaster due to cloud-based backup services, data replication, and geo-distribution.
- Scalability - scaling is adding or removing resources based on demand.
- Vertically scaling: Computing capacity can be increased by adding more processing power, RAM or CPUs to a virtual machine.
- Horizontal scaling: Computing capacity can be increased by adding instances of a resource, such as adding more Virtual machines or Containers.
What is Infrastructure as a service?
Cloud computing service that offers essential compute, storage, and networking resources on demand, on a pay-as-you-go basis.
- Most control over cloud resources, most responsibility with the consumer
- The cloud provider is responsible for maintaining the physical infrastructure, physical security, and connection to the internet.
- The consumer is responsible for everything else: maintaining the operating systems, network database and storage configuration; also data management and user access.
- It’s like renting the hardware in a cloud datacenter, you can do what you like with the hardware.
What is Platform as a service?
Cloud computing services that supply an on-demand environment/platform for developing, testing, delivering, and managing software applications. PaaS is designed to make it easier for developers to quickly create web or mobile apps, without worrying about setting up or managing the underlying infrastructure of servers, storage, network, and databases needed for development. eg heroku, google app engine.
**- Splits the responsibility between you and the cloud provider.
**- The cloud provider is responsible for maintaining the physical infrastructure, physical security, and connection to the internet. The cloud provider also maintain the operating systems, network database and storage configuration.
- The consumer is responsible for data management and user access.
- Provide a complete development environment without the headache of maintaining all the development infrastructure, you don’t have to worry about the licensing or patching for operating systems and databases.
What is software as a service?
Software as a service is a method for delivering software applications over the internet, on demand, and typically on a subscription basis. eg Jira, dropbox (you manage the data and the user access/identity only)
- Most responsibility with the cloud provider
- The cloud provider is responsible for physical security of the datacenters, power, network connectivity, and application development and patching. (Everything)
- The consumer is just responsible for the data that you put into the system, the devices that you allow to connect to the system, and the users that have access (data management and user access)
- You’re essentially renting or using a fully developed application.
