56 страниц. 2011 год. LAP Lambert Academic Publishing These days one can not think life without computer. Every moment is concerned of this gadget for its beautifulness and dependency from a childhood to end of life. This may be for entertainment to education and at later stage life support gadgets. We can be aspect any thing with computer it is users perception. Though computer hardware is the collection of various physical components of the computer like the computer itself, input/output devices, printers and other peripheral devices yet user feel its interaction. Two computer can be put to talk each other and this is what is Net Working. A computer network, often simply referred to as a network, is a collection of computers and devices connected by communications channels that facilitates communications among users and allows users to share resources with other users. In net working Communication of data propagation and processing of signals are made transmitting and receiving the signals is labeled Data Communication.