Lecture 11 Cloud Computing

Question 1

Issues in with data centres include

(A data centres is a building where a large number of inter-connected computer servers are operated.)

Answer 1

1. Rent for data centre building
2. Payment for the power supply and cooling/maintenance of the storage building
3. adding and replacing the hardware takes time
4. scaling is limited
5. must hire a 24/7 team to monitor the infrastructure
6. must be able to deal with natural disasters

Cloud computing was the solution

Question 2

Cloud computing definition

Answer 2

Cloud Computing is a system that allows a pool of configurable computing resources that can be rapidly provisioned (setup) and torn down be made available to users on a pay per use model.

(Mell & Grance, 2011).

Question 3

Cloud Computing changes computing from a ___ ____ to a ____; similar to electricity and water.

Answer 3

physical asset

service

Question 4

In cloud computing, client requests are routed to the closest ___ ____.

Answer 4

data center

Question 5

Who choose cloud

Answer 5

Customers use the services they need and are only charged for the services they use.

Companies can outsource IT and focus on their core business rather than purchasing, upgrading and managing IT servers, computers etc.

Cloud provider can easily provide extra disk space, additional storage, more memory in an instance.

Question 6

Features of cloud computing

Answer 6

Essential Characteristics

Service Models

Deployment Models

Question 7

Essential Characteristics include

Answer 7

Broad network access
rapid electricity
measured service
on demand service

resource pooling

Question 8

Service models include

Answer 8

SaaS
PaaS
IaaS

Question 9

Deployment models include

Answer 9

Public cloud
Private cloud
Hybrid cloud
Community cloud

Question 10

Broad Network Access: (EC)

Answer 10

Cloud services can be accessible at any time, from any where, from any device and through any network using standardized interfaces and access mechanisms.

ola example was accessing your email at anytime

Question 11

Measured Services: (EC)

Answer 11

provides means of measuring, controlling, monitoring and reporting of services and resources used by customers.

ola example only paying for what you use

Question 12

On-demand Self-Service: (EC)

Answer 12

cloud consumer can provision computing capabilities, such as server time and network storage, automatically and as needed without requiring intervention from the Cloud service provider.

cancelling a subscription

Question 13

Flexible payment: (EC)

Answer 13

Monthly, Weekly, hourly, per transaction or customized.

Question 14

Resource Pooling: (EC)

Answer 14

CC offers pool of computing resources to multiple consumers allowing different physical and virtual resources to be dynamically assigned and reassigned according to demand.

Question 15

Hardware Abstraction: (EC)

Answer 15

The technical complexities of the services offered by cloud computing is cloaked from the customers.

Details about the underlining technologies in use, physical location(s) of servers, network architecture, cooling structures, and number of human resources who manage the services are completely unknown to the customer.

Question 16

Rapid Elasticity: (EC)

Answer 16

ability to expand or shrink (scale up or down) resources automatically in response to customer demands.
* Vertical scaling
* Horizontal Scaling

Question 17

SaaS

Answer 17

Software As A Service (SaaS)

In this model, software application(s) owned and managed by the provider are leased by customers.

ex apps that come on your phone

Question 18

PaaS

Answer 18

Platform As A Service (PaaS)

Leasing of a computing platform (operating system, programming language, database, and web server) where application developers can develop and run their software solutions, thereby eliminating the cost and complexity of buying and managing the underlying hardware and software layers

ie blueJ

Question 19

IaaS

Answer 19

Infrastructure As A Service (IaaS)

Computing infrastructure are made available to users, including CPU, storage, network, and any other related computing resources and are provisioned for the customer using virtual machines on a perneed basis.

ex. Vbox

Question 20

XAAS

Answer 20

Everything as a Service (XAAS)

X => Cars – Uber, Bolt; X => Education – Module, Coursera; X => Houses – Airbnb, etc.

udemy
codeacademy
coursera
edX — for XAAS think Braden

Question 21

Horizontal and Vertical Scaling both involve adding _____ to _____ ________.

Answer 21

resources to computing infrastructure.

Question 22

Vertical scaling refers to scaling by adding more _____

Answer 22

power (up)

(e.g., Storage, Memory) to an existing machine. It is also known as “scaling up”. There is a limit, so you must add more to your pool of resources if you run out of storage!

Question 23

Horizontal scaling involves adding more ____

Answer 23

machines to your pool of resources (wide, physically)

(also described as “scaling out”).

used to achieve High Availability

Question 24

Content Distribution Networks

Answer 24

option 1: single, large “mega-server”
option 2: store/serve multiple copies of videos at multiple
geographically distributed sites (CDN)