The word data refers to information presented in whatever form is agreed upon by the parties creating and using the data.
Data communications are the exchange of data between two devices via some form of transmission medium such as wire cable.
In Distributed Processing a task is divided among multiple computers. Instead of one single large machine being responsible for all aspects of process, separate computers handle a subnet.
The term physical topology refers to the way in which a network is laid out physically.
The topology of a network is the geometric representation of the relationship of all the links and linking devices to one another.
A Local Area Network(LAN) is usually privately owned and links the devices in a single office, building or campus.
A Wide Area Network(WAN) provide long-distance transmission of data, image, audio and video information over large geographic areas that may comprise a country, a region etc.
A Metropolitan Area Network(MAN) is a network with a size between a LAN and WAN. It normally covers the area inside a town or city. It is designed for customers who need a high-speed connectivity, normally to the internet and endpoints spread over a city or part of a city.
When two or more networks are connected, they are become internetwork or internet. When the network combine networks worldwide is Internet(I) .
Network Operating System indicates some operating system that has some special functionality required to perform jobs involving a network as well as general operating system functionality. Now a days most operating systems has this functionality such as windows xp, vista, 7, Mac, Linx versions Ubuntu, redhat etc.
Server Operating Systems are designed to be used for some special service run on it to serve people online. These services are File Service, Domain Name Service, Mail Service and the most popular server operating system is Redhat.
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