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AZ-900 > Describe cloud concepts > Flashcards

Describe cloud concepts Flashcards

1
Q

Define cloud computing

A

Cloud computing is the delivery of computing services over the internet.

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2
Q

Give 7 examples of cloud computing services

A 
Servers
Storage
Databases
Networking
Software
Analytics
Intelligence
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3
Q

Describe the shared responsability model

A

There’s an agreement between you and Microsoft, some responsabilites transfer to Microsoft according to the deployment of your stack, and you are always responsible for:

Data and identities (and its security)
Endpoints
Account
Access management
On-premise resources
The cloud components you control
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4
Q

Whhich are the 3 differents types of cloud models?

A

Public
Private
Hybrid

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5
Q

Describe the public-cloud model

A

Services are offered to the public internet and available to anyone who wants to purchase them

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6
Q

Describe the private-cloud model

A

Computing resources are used by users from one specific business or organization.

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7
Q

Where are the resources of a private-cloud located?

A

They could be at your organization’s on-site datacenter, or hosted by a third-party service provider.

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8
Q

Describe the hybrid-cloud model

A

A computing environment that combines a public and private cloud by allowing data and apps to be shared between them.

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9
Q

Describe the consumption-based model

A

You pay for what you use.
You rent some resources from the cloud provider, pay for those and once you’re done using them, you give them back.

This is also known as the ‘‘pay-as-you-go’’ model

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10
Q

Which are the Azure pricing models?

A

Pay-as-you-go
Reserved instances
Spot pricing

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11
Q

Is there a free Azure subscription?

A

Yes, and you can use it for 12 months.

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12
Q

Describe the reserved-instances pricing model

A

Azure provides Reserved Virtual Machines.
These RVMI are pre-purchased for one or three years in a specific region.

These model offers a discount up to 72% compared to the pay-as-you-go model.

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13
Q

Is there an early termination fee if you wish to cancel RI before the end of the term?

A

Yes there is

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14
Q

What is the RVMI model suitable for?

A

It is best for:
applications with stable usage
organizations with a fixed budget
large scale org who always need a certain number of VMs

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15
Q

Describe the spot pricing model

A

Azure lets you buy unused computing power at a discount of up to 90% compared to pay as you go prices. However, spot instances can be interrupted on short notice, so they are considered to be suitable only for workloads that can tolerate disruptions.

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16
Q

What is high availability in the cloud?

A

Depending on the service-level agreement (SLA) that you choose, your cloud-based apps can provide a continuous user experience with no apparent downtime, even when things go wrong.

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17
Q

Describe vertical scalability

A

Increase in compute capacity by adding RAM or CPUs to a virtual machine.

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18
Q

Describe horizontal scalability

A

It increases compute capacity by adding instances of resources, such as adding VMs to the configuration.

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19
Q

What’s elasticity in the cloud?

A

Autoscaling!

20
Q

Describe reliability in the cloud

A 
Auto-healing
SLA
Auto-scale
Storage x3
Design for failure
Monitor
21
Q

Describe the benefits of predictability in the cloud

A

SKU –> ACU
Behavior
Use templates

22
Q

What are 4 benefits of cloud governance

A

Improves cloud resource management
Reduces shadow IT
Reduces administrative overhead
Improves cloud security issues

23
Q

It is a set of rules and policies adopted by companies that run services in the cloud.

A

Cloud governance

24
Q

It’s goal is to enhance data security, manage risk, and enable the smooth operation of cloud systems.

A

Cloud governance

25
Q

What is cloud management?

A

It refers to the exercise of control over public, private or hybrid cloud infrastructure, resources and services.

26
Q

How can cloud management help organizations?

A

Self-service
Workflow automation
Cloud analysis

27
Q

What are some essential cloud management areas?

A 
Automation and orchestration
Security
Governance and compliance
Performance monitoring
Cost management
28
Q

What does IaaS mean?

A

Infrastructure as a Service

29
Q

What does PaaS mean?

A

Platform as a Service

30
Q

What does SaaS mean?

A

Software as a Service

31
Q

Describe IaaS

A

This cloud service model is the closest to managing physical servers; a cloud provider will keep the hardware up-to-date, but operating system maintenance and network configuration is up to you.

32
Q

What are some advantages of IaaS?

A

Rapid deployment of new compute devices.
No Cap-Ex
It is the most-flexible cloud service.

33
Q

This cloud service model is a managed hosting environment.

A

PaaS

34
Q

Describe PaaS

A

The cloud provider manages the virtual machines and networking resources, and the cloud tenant deploys their applications into the managed hosting environment

35
Q

Users can focus on application development only, because the cloud provider handles all platform management.

A

PaaS

36
Q

Is PaaS more agile than Iaas?

Yes/no and why?

A

Yes

PaaS is more agile than IaaS because users don’t need to configure servers for running applications.

37
Q

What is a disadvantage of PaaS?

A

Platform limitations…

38
Q

In this cloud service model, the cloud provider manages all aspects of the application environment, such as:

Virtual machines
Networking resources,
Data storage
Applications

A

SaaS

39
Q

Describe SaaS

A

The cloud tenant only needs to provide their data to the application managed by the cloud provider.

40
Q

What is a disadvantage of SaaS?

A

Software limitations

You don’t have direct control of features.

41
Q

What is the pricing model of SaaS?

A

Pay-as-you-go

42
Q

What are some examples of SaaS?

A

Microsoft Teams

Microsoft 365

43
Q

…are highly scalable and event-driven, only using resources when a specific function or trigger occurs.

A

Serverless architectures

44
Q

Describe Cap-Ex

A

Capital Expenditure

Big up-front cost on physical infrastructure.

45
Q

Describe Op-Ex

A

Operational Expenditure

Little up-front cost, since you are spending money on services or products now, and being billed for them now

46
Q

Which of the following statements is true?

a) With Operating Expenses (OpEx), you are responsible for purchasing and maintaining your computing resources.
b) With Operating Expenses (OpEx), you are only responsible for the computing resources that you use.
c) With Capital Expenses (CapEx), you are only responsible for the computing resources that you use.

A

b) With Operating Expenses (OpEx), you are only responsible for the computing resources that you use.

47
Q
  1. Which of the following choices isn’t a benefit of using cloud services?

Scalability

Disaster recovery

High availability

Geographic isolation

A

Geographic isolation

AZ-900 (9 decks)

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