CLOUD

What is Cloud?

Cloud refers to a Network or Internet, which is present at a certain place which accessible from any location over a public network or private network.

Cloud Computing refers to manage, configuring, and accessing the applications online. It offers online data storage, compute, network infrastructure and application which delivered as a network service.

Cloud Computing Idea

Separate IT infrastructure from the main system managed separately by one party, accessible anywhere via the internet and may shared.

Deploying Cloud means outsourcing "Infrastructure" management and risks the third party, and company could be more focus on "business"

Deployment Examples

• Social Networking : Facebook, Instagram, Linkedin, etc.
• Data Sharing: Email, Dropbox, etc.
• Education: Quipper, Smart Campus, E-learning, etc.
• Business: Online shop portal, Google doc, etc.

Basic Concepts

Deployment Model

Deployment models define the type of access to the cloud, how they located.

Types of access : 

Public Cloud 

Accessible over the internet for general consumption.

Hybrid Cloud

A composition of 2 or more interoperable clouds, enabling data and application portability

Private Cloud

Operated solely for an organization, within the network firewall

Advantages and Disadvantages

Advantages 

• Lower compute resource cost
• Flexible performance improvement
• Reduced software/hardware cost
• Manageable infrastructure update
• Relieve storage capacity limitation
• Increased data reliability
• Universal data access
• Easier group collaboration
• Device independence

Disadvantages

• Requires a constant Internet connection
• Features might be limited
• Performance/speed concern
• Data/system contigency plan
• Data security concern
• Doesn't work with low-speed connection