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BTE 210- Exam 2 Questions And Correct Answers
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BTE 210- Exam 2 Questions And Correct AnswersCC - Cloud Computing
A method of delivering business and IT services. It is the utilization of network
resources, mainly internet resources, for providing on-demand data processing and
storage
Characteristics of cloud computing
No need to know underlying details and infrastructure
Flexibility and elasticity - enables the systems to scale up and down
Pay much as used and required - pay per use
Advantages of Cloud Computing
Lower Costs: No need for expensive computer to run web-based applications because
they are not run on the actual PC
More flexible, pay per use, multitenancy, or a single instance of software runs on a
server and is used by multiple tenants, elastic capacity refers to how much a system can
adapt to workload changes through autonomic resource controlling
Perfomance Enhancements: Computers on a cloud system startup and load programs
quicker, software updates occur effortlessly and invisibly, data is more centralised, eg if
the HD crashes you don't lose all storage and provides device independence - can
operate on many different devices regardless of the hardware on that device
Drawbacks of Cloud Computing
Must always be connected to the internet
, Mighty slow internet speeds do not function as efficiently
Limited selection of software applications compared with desktop applications
3 Cloud Service Models
Saas -software as a service
Paas - platform as a service
Iaas -infrastructure as a service
PaaS
You deploy your application on an application hosting environment provided by the
cloud service vendor. Provides a platform for software creation, not over-the-internet
delivery of software.
Frees developers managing hardware infrastructure development and allows them to
focus strictly on development of software
Saas
Centrally hosted and managed on behalf of the end-customer delivers software on
demand
Usually multitenant architecture single version of application for all customers
Licensing typically through a monthly or annual subscription i.e., Office 365
IaaS
IaaS cloud vendor operates server farms running virtualization software that lets you
create Virtual Machines VMs that run on cloud vendors' infrastructure Infrastructure via
virtualization
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