The document discusses cloud computing, defining it as enabling on-demand access to a shared pool of configurable computing resources over a network. It describes the front end that users see and back end cloud components of data storage, application servers, and control nodes. The document also outlines key characteristics of cloud computing like elasticity and scalability, and categories of cloud services including Infrastructure as a Service, Platform as a Service, and Software as a Service.

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2.  Cloud computing is a model for
enabling convenient, on-demand
network access to a shared pool of
configurable computing resources
(e.g., networks, servers, storage,
applications, and services) that can
be rapidly provisioned and released
with minimal management effort or
service provider interaction.
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3.  Front End is the section which the
computer user can see.
 Back End is the cloud section of the
system. Its three components are:
› Data Storage
› Application Server
› Control nodes
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4.  Elasticity and Scalability
 Self Service Provisioning and Automatic
Releasing
 Standardized Interfaces
 Pay as you go model
 Performance monitoring and measuring
 Maintenance
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5.  Infrastructure as a Service (IaaS)
Example: Amazon EC2
 Platform as a Service (PaaS)
Example: Google App Engine
 Software as a Service (SaaS)
Example: Google Apps
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6.  Public Clouds
 Private Clouds
 Community Clouds
 Hybrid Clouds
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7.  Google:
› Google Apps
› Google App Engine
 Amazon:
› Simple Storage Service(S3)
› Elastic Compute Cloud(EC2)
 Microsoft Azure Service Platform
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8.  Reduced Costs
 Reliability
 Scalability
 Accessibility
 Limitless storage space
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9.  Cloud Security
› Identity management
› Detection and forensics
› Encryption
 Cloud Manageability
 Service Level Agreement(SLA)
 Cloud Standards
 Data in the Cloud
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