-Network is a collection of computers and mobile devices connected together via communication device and transmission media ofter wirelessly allowing computer to share resources.


COMMUNICATION DEVICE:
-Hardware component enables a computer to send (transmit) and receive data, instructions, and informations to and from one or more computers.

EXAMPLES: HUB, ROUTER, SWITCH

HUB	ROUTER	SWITCH

 TRANSMISSION MEDIA:
-It describe the type of physical system used to carry a communication signal from one system to another.
-Types of transmission media.
        1) Physical- send signals through cable,wire or  tangible materials.
        2) Wireless- send signal through air to space.
EXAMPLES  OF  PHYSICAL TRANSMISSION MEDIA

TWISTED-PAIR CABLE	FIBER OPTIC CABLE	COAXIAL CABLE

EXAMPLES OF WIRELESS TRANSMISSION MEDIA

COMMUNICATION SATELLITE	BROADCAST RADIO	CELLULAR RADIO
INFRARED	MICROWAVES	BLUETOOTH