4. INTRODUCTION
*Why the Cloud symbol?
Depiction of the Internet as a cloud in
Network Diagrams / Flow Charts
*What is cloud Computing?
Cloud computing is Internet-based computing
whereby share resources, software, and information are
provided to computers.
What is cloud?
7. Characteristics of Cloud Computing
Cloud
Computing
On-
demand
self-
service
Ubiquitous
network
access
Resource
pooling
Rapid
elasticity
Flexible
pricing -
Pay per
use
8. Cloud Service Models
• SaaS is a software delivery methodology that
provides licensed multi-tenant access to software
and its functions remotely as a Web-based
service.
Software as a
Service (SaaS)
• PaaS provides all of the facilities required to
support the complete life cycle of building and
delivering web applications and services entirely
from the Internet. (Runtime environment)
Platform as a
Service (PaaS)
• IaaS is the delivery of technology infrastructure
as an on demand scalable service.
Infrastructure
as a Service
(IaaS)
9. Cloud Service models - Examples
Software as a
Service (SaaS)
Platform as a
Service (PaaS)
Infrastructure
as a Service
(IaaS)
11. Advantages of Cloud Computing
*Lower Computing Cost
*Improved Performance
*Reduced Software Cost
*Instant Software Updates
*Unlimited Storage Capacity
*Device Independence and the “always on!, anywhere
and any place”
*Free From Maintenance and the “no-need-to-know”
12. Disadvantages of Cloud Computing
*Needs Constant high speed internet connection
*Subject to Security issues –Data is not so secure
since it is on remote servers
*May not work with slow internet connections
