4.1 Cloud Computing Concepts

Question 1

What are the common cloud models?

Answer 1

IaaS, SaaS, Paas.

Question 2

What does IaaS mean?

Answer 2

IaaS = Infrastructure as a service.

Question 3

What is IaaS?

Answer 3

It provides virtualization to minimize idle hardware, protect against data loss and downtime, and respond to spikes in demand.

Question 4

What does PaaS stand for?

Answer 4

PaaS = Platform as a service.

Question 5

What is PaaS?

Answer 5

Essentially renting the physical machine needed to do the work, or renting a virtual machine.

Question 6

What does SaaS stand for?

Answer 6

Saas = Software as a service

Question 7

What is software as a servoce?

Answer 7

The best example of this is Microsoft office. You pay a monthly subscription to use their office programs.

Question 8

What is a public cloud/community?

Answer 8

Software, platforms, and infrastructure (SaaS, Iaas, Paas) delivered through network that the general public can use.

Question 9

What is a private cloud/community?

Answer 9

It is a cloud that is built internally to allow flexibility, and complete ownership of its data. You could, for example, buy a cloud drive from best buy and hook it up to your network. It will only be viewable to those you give access to.

Question 10

What is a community cloud/community?

Answer 10

A community cloud is more like a private cloud paid for and used by more than one organization. It is usually a cloud run by a group of organizations with similar goals or needs.

Question 11

What is a hybrid cloud/community?

Answer 11

A hybrid cloud is a cloud built by some connecting some combination of public, private, and community clouds, allowing communication between them.

Question 12

What are shared resources?

Answer 12

Real hardware can be virtualized, meaning made available as partial or full resources to a virtual machine. Hardware can be combined and then shared; these shared resources can be both internal and external and apply to one or many machines. Virtualization provides flexibility.

Question 13

What is Rapid Elasticity?

Answer 13

Let’s say you start a new Web application. If you use an IaaS provider such as Amazon, you can start with a single server and get your new Web application out there. But what happens if your application gets really, really popular? No problem! Using AWS features, you can easily expand the number of servers, even spread them out geographically, with just a click of the switch. We call this ability rapid elasticity.

Question 14

What is On-Demand?

Answer 14

So what if you have a Web application that has wild swings in demand? A local university wants to sell football tickets online. When there isn’t a game coming, their bandwidth demands are very low. But when a game is announced, the Web site is pounded with ticket requests. With cloud
computing, it’s easy to set up your application to add or reduce capacity based on demand with on-demand. The application adjusts according to the current demands.

Question 15

What is Resource Pooling?

Answer 15

Any time you can consolidate systems’ physical and time resources, you are resource pooling. While a single server can pool the resources of a few physical servers, imagine the power of a company like Amazon. AWS server farms are a massive, pooling resources that would normally take up millions of diverse physical servers spread all over the world!

Question 16

What is a measured service?

Answer 16

In some cases you are charged based on the traffic that goes in and out of your Web application, and in other cases you pay for the time that every single one of your virtualized servers is
running. Regardless of how costs are measured, this is called measured service because of how it differs from more traditional hosting with a fixed monthly or yearly fee.

Question 17

What is a metered service?

Answer 17

Some companies charge by the amount of processing
resources used, such as CPU usage, a metered service rate. This enables very careful monetizing of resources used. You pay for what parts of the hardware
you use, rather than a more general fee for all the hardware of a system.

Question 18

Explain cloud file storage services and synchronization.

Answer 18

Dropbox, was a great early example of cloud storage service. May cloud storage services also have synchronization apps so that you can easily have the same version of every file in multiple places (desktop, laptop, online, etc).

Question 19

Explain cloud based applications.

Answer 19

The best example is Microsoft Office and the implementation of their office suite. If I were to go to my one drive, I could access Word, Excel, even Power Point, virtually online via the cloud.

Question 20

Where can you access cloud based applications?

Answer 20

Using the office suite as an example, you can access these cloud based applications virtually anywhere such as your phone, tablet, laptop, and desktop.

Question 21

Explain cloud based virtual desktops.

Answer 21

Any laptop (or computer) with an internet connection can spin up a virtual desktop with a few times more processing power, giving you the ability to play the latest games at max settings. Accessing this virtual machine by connecting to it via the internet is a cloud based virtual desktop.