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Cloud Computing > 1 - Intro > Flashcards

1 - Intro Flashcards

1
Q

Public Cloud

A

Infrastructure for general public or large industry group

Low cost, low trust and low flexibility

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2
Q

Hybrid Cloud

A

Composition of two or more clouds (private, community or public) that remain unique entities but are bound together by tech that enables data and app portability

Medium cost, medium trust and medium flexibility

“by tech” can mean proprietary or standardised

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3
Q

Community Cloud

A

Infrastructure shared by several orgs and suports a specific community with specific joint concerns. Can be on or off premise.

Variable cost, High flexibility (limited by policies), High trust

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4
Q

Private Cloud

A

Operated for one org, internal or external host. Can be on or off premise

High cost, trust and flexibility

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5
Q

IaaS

A

Infrastructure as a Service
Deploy arbitrary software, can include operating systems
No control of HW
The user is provisioned virtual machines of their choosing

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6
Q

Paas

A

Platform as a Service
Deploy consumer-created apps using programming lang provided by provider.
User controls deployed apps
The user has no infrastructure control

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7
Q

Saas

A

Software as a Service
Only apps provided by service are run on the service

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8
Q

Where is cloud infrastructure hosted?

Physically (not where they are logically on the internet)

A

Datacentres of various sizes

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9
Q

Why should companies move IT to cloud?

A

Reduce capital expenditure
Always up to date
High availability
Scalable

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10
Q

Reason(s) not to move IT to cloud

A

Retain full control of data & hardware

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11
Q

Concerns when moving to cloud

A

Loss of control
Lack of trust - who can access?
Multitenancy

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12
Q

What does multi-tenancy mean?

A

Sharing infrastructure with others (likely strangers)

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13
Q

Can a company use more than one cloud type at once

A

Yes.

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14
Q

NHS Trusts: Community Cloud MUST be used?? True or false

A

False. It may be favourable but perhaps private cloud may be quicker in the short term

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15
Q

For a retail company moving its infra to cloud, which model might it use?

A

Hybrid - Public for customer services and private for storing business sensitive data

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16
Q

Advantage of IaaS over Paas

A

IaaS provides greater flexibility

17
Q

Advantage of Paas over IaaS

A

PaaS removes the need to set up and maintain deployment environments.

18
Q

Definition of Cloud Computing

A

model for enabling ubiquitous, convenient, on-demand network access to a shared pool of configurable resources.

These can be rapidly provisioned and released with minimal effort or service provider interaction.

19
Q

Attributes of Cloud Computing

A

On-Demand self service
Accessible via the internet
Rapid elasticity
Utility computing
Resource pooling

20
Q

What is On-Demand Self Service

A

Anytime, Anywhere; often with 99.9% (three
nines) to 99.999% (five nines) uptime guarantee
You can provision the exact amount of resource you need at any time by yourself

21
Q

What does the attribute “accessible via the internet” mean?

In terms of network access

A

Requires broad network access; slow service response time impairs usability

22
Q

What is Rapid elasticity

A

Rapid resource scaling, e.g., dealing with ‘flash crowd’

23
Q

What is utility computing

A

Metered like utilities, e.g. water, gas, electricity.
Only pay for what you use.

24
Q

What is Resource Pooling

A

All compute resources are put into a single pool via resource virtualisation

25
Q

What are the Cloud Depoyment Models

A

Public
Private
Community
Hybrid

26
Q

Examples of PaaS

A

Google App Services

26
Q

Examples of IaaS

A

Amazon Web Services AWS
Google Compute Engine
Microsoft Azure

27
Q

Examples of SaaS

A

Google Workspaces
Microsoft 365
DropBox

28
Q

What hardware do datacenters use

Think about server types

A

Commodity servers accross large distributed systems

29
Q

What hardware do Super computers use

A

Specialised high power servers connected to run as one compute engine

30
Q

Cloud datacenters

A

Have various sizes
Are distributed systems using commodity hardware
Are virtualised and autonomous to make management easier

31
Q

Benefits of Resource Virtualisation

A

elasticity
Improves server manageability
performance isolation
efficient sharing

32
Q

Whatis DDOS as a service?

A

Cheap and easy method of taking down servers using high traffic levels

Cloud Computing (10 decks)

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