LO 1: Define what is computer network and
its components
A computer network is a group of
computer system and other computing hardware devices that are linked together
through communication channels to facilitate communication and resource-sharing
among a wide range of users. Network is a collection of computers and devices
connected together via communication devices and transmission media. Usually,
the connections between computers in a network are made using physical wires or
cables. However, some connections are wireless, using radio waves or infrared
signals. There are two types of transmission media which is guided (wired) and
unguided (wireless). Guided (wired) is a tangible media such as twisted-pair
cable, coaxial cable and fibre-optics. Unguided (wireless) is an intangible
media such as transmit through the air. Twisted-pair cable is one or more
twisted wires bundled together which made of copper. Coaxial cable consists of
single copper wire surrounded by three layers of insulating and metal
materials. Typically used for cable TV. Fibre-optics is strands of glass or
plastic used to transmit light. It is very high capacity, low noise, small size
and less suitable to natural disturbances.
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