AZ-900 Domain 1: Describe cloud concepts (25–30%)

Cloud computing

Cloud computing is the delivery of computing services over the internet

 

Benefits of Cloud Computing

Cloud is cost-effective,global, secure, scalable, elastic, and always current

Public Cloud

Everything runs on your cloud provider's hardware. Advantages include scalability, agility, PAYG, no maintenance, and low skills

Private Cloud

A cloud environment in your  own datacenter Advantages include legacy support, control, and compliance

Hybrid Cloud

Combines public and private clouds, allowing you to run your apps in the right location Advantages include flexibility in legacy, compliance, and scalability scenarios

Economies of Scale

The ability to do things more efficiently or at a lower-cost per unit when operating at a larger scale.

Capital Expenditure

Capital Expenditure (CapEx) is the spending of money on physical infrastructure up front

Operational Expenditure

Operational Expenditure (OpEx) is spending money on services or products now and being billed as you go. The Cloud increases OPEX spending and reduces CapEx spending

 Consumption- based model

 Pay for what you use, typically per unit of time or capacity (per-minute, per-GB, per-execution)

Fixed price model

You provision resources and pay for those instances whether you use them or not

Serverless Architecture

a cloud computing execution model where the cloud provider dynamically manages the allocation and provisioning of servers hosted as pay-as-you-go model based on use. Resources are stateless, servers ephemeral and often capable of being triggered.

Logic App

A cloud service that helps you schedule, automate, and orchestrate tasks, business processes, and workflows

Functions

An event driven, compute-on-demand experience that extends the existing Azure application platform with capabilities to implement code triggered by events occurring in Azure as well as on-premises systems

Event Grid

Enables you to easily manage events across many different Azure services and applications once a subscription is created, Event Grid will push events to the configured destination

Availability

Encompasses availability of the infrastructure, applications, and services

Scalability

The ability of a system to handle growth of users or work

Elasticity

The ability of a system to automatically grow and shrink based on app demand

Agility

Focuses on the speed and ease of allocating and deallocating resources

Fault Tolerance

The ability of a system to handle faults in a service like power, network, or hardware failures Generally, refers to component-level failures

High Availability

The ability to keep services up and running for long periods of time. Generally, refers to service-level Failures

Disaster Recovery

The ability to recover from an event which has taken down a cloud service. Generally. focuses on recovery in the event of a service or site failure

Reliability

The ability of a system to recover from failures and continue to function. Reliability consists of two principles: resiliency and availability.

Predictability

Azure enables solutions with predictable cost and performance

Security

Protection of custorner (access control, encryption) Protection of cloud applications  Protection of cloud infrastructure

Azure DDoS

standard tier provides enhanced DDoS mitigation features to defend against DDoS attacks. Also includes alerting, and telemetry not included in the free Basic tier present by default.

Governance

A set of rules and policies that guide an organization's cloud operations to ensure data security, manage risk, control costs, and improve efficiency

IaaS (Infrastructure as a Service)

You rent the basic computer stuff (servers, storage, networking) online instead of owning it.

PaaS (Platform as a Service)

You get a ready-to-use environment to build and run apps without worrying about setup.

SaaS (Software as a Service)

You just use the software online, no installation or setup needed.