Section 9 - Cloud Computing

Question 1

What is cloud computing

Answer 1

Practice of using a network of remote servers hosted on the internet

Question 2

What is high availability in terms of the cloud

Answer 2

Services experience very little downtime when using the cloud

Question 3

Availability equation

Answer 3

% uptime compared to downtime

Question 4

What does 5 9ns refer to

Answer 4

99.999% which means 5 mins and 15 seconds of downtime /year

Question 5

Define scalability

Answer 5

Ability to increase or decrease IT computing capacity as needed to meet changing demand

Question 6

Define Vertical Scaling (scaling up)

Answer 6

Increasing the power of the existing resources in the working environment

Question 7

Define horizontal scaling (scaling out)

Answer 7

Adding additional resources to help handle the extra load being experienced

Question 8

Explain rapid elasticity

Answer 8

Ability to quickly scale up or down to meet the needs of the workload

Question 9

Define metered utilization

Answer 9

Being charged for a service on a pay per use basis

Question 10

Name a benefit of using metered services

Answer 10

Things are done on a metered basis

Question 11

Define shared resources

Answer 11

pooling together all the hardware to make a cloud provider

Question 12

Define file synchronisation

Answer 12

Ability to store data which can then spread to other places depending on the configuration, commonly used in remote jobs

Question 13

Define public cloud

Answer 13

Systems and users interact with devices on public networks, such as the internet and other cloud. The most common, e.g. google drive

Question 14

Define private cloud

Answer 14

Systems and users only have access with other devices inside the same private cloud or system

Question 15

Define hybrid cloud

Answer 15

combination of private and public cloud, some resources developed by the org but some are also made by public

Question 16

Define community cloud

Answer 16

Collaborative effort where infrastructure is shared between several different orgs with common service needs

Question 17

Define multitenancy

Answer 17

ability for customers to share computing resources in a public or
private cloud

Question 18

Define single-tenancy

Answer 18

Assigns a particular resource to a single org

Question 19

Analyse on-premise solution

Answer 19

costly, needs to procure hardware, software and personnel necessary to run the org’s cloud

Question 20

Define hosted solution

Answer 20

3rd party service that provides all hardware and facilities needed to maintain a cloud solution e.g. amazon AWS, google

Question 21

In terms of control what does a on-premise solution allow

Answer 21

Ability to control all the physical and logical access to servers

Question 22

Danger of multitenancy solution

Answer 22

data may be exposed to other servers

Question 23

What are the 3 cloud service model

Answer 23

IaaS,PaaS,SaaS

Question 24

What does IaaS provide

Answer 24

Everything that you need to run a server (power, space, cooling, network, firewall, physical servers, virtualisation layer, sometimes OS)

Question 24

What do IaaS,PaaS,SaaS stand for

Answer 24

Infractructure , Platform ,Software As a service

Question 25

What does PaaS provide

Answer 25

OS, infrastructure software (Apache webserver, MySQL database. Programming language)

Question 26

What does SaaS provide

Answer 26

Hosted application piece of software

Question 27

What does a Virtual Desktop Infrastructure (VDI) do

Answer 27

Hosts desktop OSs within a virtualised environment hosted by a centralised server or server farm

Question 28

What is the VDI server going to be in charge of

Answer 28

Perform all the app processing and data storage

Question 29

Define centralised model (desktops)

Answer 29

Hosts all the desktop instances on a single server or server farm

Question 30

Define Hosted mode / Desktop as a service (DaaS)

Answer 30

Maintained by a service provider and provided to the end user as a service

Question 31

Define Remote Virtual Desktop Model

Answer 31

Copies the desktop image to a local machine prior to being used by the end user

Question 32

Name a disadvantage of VDI

Answer 32

If the server that the computer is being hosted by goes down, access to those files are restricted

Question 33

Define cloud storage

Answer 33

Amount of space on a cloud-based server as file storage (e.g. dropbox, google drive)

Question 34

Define file synchronisation

Answer 34

ability to synchronise from different devices using a single account

Question 35

Define content delivery network (CDN)

Answer 35

Network of servers that locate the nearest server to minimise the delay or download time

Question 36

function of Software-define networking (SDN)

Answer 36

Enables the network to be intelligently and centrally controlled, or programmed, using software apps

Question 37

Describe a feature of SDN

Answer 37

Can be changed automatically by the network itself using automation and orchestration

Question 38

What is management plane used for

Answer 38

Monitor traffic conditions and the status of the network

Question 39

With SDNs what layers must we understand

Answer 39

App, control, infrastructure & management plane

Question 40

Explain the application layer

Answer 40

Focuses on the communication resource requests or information about the network as a whole

Question 41

Define control layer

Answer 41

Uses the information from the apps and decides how to route a data packet on the network, how data should be prioritised

Question 42

Define infrastructure layer

Answer 42

contains the network devices that receive information about where to store the data