4.1 Cloud Computing Concepts

Question 1

Cloud Computing

Answer 1

• on-demand availability of computing resources (ex storage, infrastructure) as services over the Internet
• server hosted elsewhere

Question 2

Private Cloud

Answer 2

• company’s own virtualized local data center
• not shared

Question 3

Public Cloud

Answer 3

• available to everyone over the internet (ie. Microsoft and Amazon cloud services)

Question 4

Hybrid Cloud

Answer 4

• mix of private and public cloud

Question 5

Community Cloud

Answer 5

• several organizations sharing the same cloud
• save on costs

Question 6

Infrastructure as a Service (IaaS)

Answer 6

• outsource your equipment
• provides the hardware (CPU, storage, network, etc) to run an app
• in-user still responsible for the management and security
• ex. Web server providers

Question 7

Software as a Service (SaaS)

Answer 7

• on-demand software
• log into cloud and access software
• SaaS provider stores, manages, and protects the apps

Ex. Google Mail, Microsoft 365

Question 8

Platform as a Service (PaaS)

Answer 8

• no servers, no software, no maintenance
• provides a platform where the user can build their own application
• user doesn’t have direct control of the data or infrastructure

Ex. SalesForce.com. Windows Azure

Question 9

Internal Cloud

Answer 9

• private or corporate cloud
• build your own cloud at your own data center
• no resources shared
• pay for everything up front
• no ongoing cost

Question 10

External Cloud

Answer 10

• share resources with a public cloud
• underlying infrastructure owned by a third-party
• cost may be metered or up-front

Question 11

Metered vs Non-Metered Cloud Services

Answer 11

Metered:
- you pay for what you use and how much you use
- cost to upload, store, download
Non-metered:
- flat payment for a block of storage
- no cost to upload or download

Question 12

Cloud Computing Characteristics

Answer 12

Rapid Elasticity
- scale up and down as needed
- seamless adjustment
- cloud enables instant resource provisioning

High Availability
- redundancy provides availability even if the server loses power or goes down

File Synchronization
- info can be duplicated across different cloud locations

Question 13

Desktop as a Service (DaaS)

Answer 13

Virtual Desktop Intrastructure
- access your desktop from a cloud
- basically a screen share
- applications can run on a remote server
- minimal memory or CPU requirements on the client