Definition of Network
A network is a collection of computers and devices connected together via communications devices and transmission media.
A computer network
is a collection of computers and other hardware devices that are
connected together to share hardware, software and data as well as to
communicate electronically with one another.
How The Data Transmit In Network
Communication Device
Hardware component that enables a computer to send (transmit) and
receive data, instructions, and information to and from one or more
computers
Examples:
cable modem, wireless modem, network cards, hubs & switches.
Transmission Media
Materials or substances capable of carrying one or more signals in a communications channel.
Example
physical transmission media: twisted-pair cable, coaxial cable & fiber-optic cable.
wireless transmission media: Infrared, broadcast radio, cellular radio, microwave radio & communication satellite.
