computer networking

A network is a set of devices (often referred to as nodes) connected by communication links in order to communicate and share resources.

Computer networks may be classified according to the scale:-

            Local area network (LAN)

                   Metropolitan area network (MAN)

                   Wide area network (WAN)

             Local area network (LAN)

                       LAN connects networking devices with in short span of area, i.e. small offices, home, nternet cafes etc

           Spanned inside a building and operated under single administrative system 

          It uses TCP/IP network protocol for communication between computers

          LAN provides a useful way of sharing the resources between end users. The resources such as printers, file servers, scanners, and internet are easily sharable among computers 

           LAN can be wired,wireless, or in both forms at once.

          

Metropolitan area network (MAN)

              

MAN generally expands throughout a city such as cable TV network

Metro Ethernet is a service which is provided by ISPs

This service enables its users to expand their Local Area Networks.

For example, MAN can help an organization to connect all of its offices in a city.

MAN works in between Local Area Network and Wide Area Network

MAN provides uplink for LANs to WANs or internet

 

Wide area network (WAN)

WAN connection between computers over large geographical areas that may comprise a country, a continent, or even the whole world

Dedicated transoceanic cabling or satellite uplinks may be used to connect this type of global network

These networks provide connectivity to MANs and LANs

The Internet itself is the biggest example of WAN

What is Internet

It is a Global network of computers, (servers or clients) to exchange information.

It is a "network of networks" that includes millions of  private and public, academic, business, and government networks (local or Global), linked by copper wires, wireless connections, and other technologies  

Intranet

    Internal company network that uses Internet standards (HTML, HTTP & TCP/IP protocols) & software.

   Accessed only by authorized persons, especially members or employees of the organization  

Extra-net

     Extranet is an Intranet for outside authorized users using same internet technology. 

 Website

     is representation of electronic of any organization.

Type of website

     Static : This is type of website that all user can see and interact with the same content in it.example www.suza.ac.tz

     Dynamic:This is type of website that any user interact with different content in it.example Zalongwa.