Thursday 11 June 2015

Computer Comm Network

A network is simply defined as something that connects things together for
a specific purpose. The term network is used in a variety of contexts,
including telephone, television, computer, or even people networks.
A computer network connects two or more devices together to share a
nearly limitless range of information and services, including:
• Documents
• Email and messaging
• Websites
• Databases

• Music
• Printers and faxes
• Telephony and videoconferencing
Protocols are rules that govern how devices communicate and share
information across a network. Examples of protocols include:
• IP – Internet Protocol
• HTTP - Hyper Text Transfer Protocol
• SMTP – Simple Mail Transfer Protocol
Multiple protocols often work together to facilitate end-to-end network
communication, forming protocol suites or stacks. Protocols are covered in
great detail in other guides.
Network reference models were developed to allow products from different
manufacturers to interoperate on a network. A network reference model
serves as a blueprint, detailing standards for how protocol communication
should occur.
The Open Systems Interconnect (OSI) and Department of Defense (DoD)
models are the most widely recognized reference models. Both are covered
in great detail in another guide.

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