Network – A collection of computers and mobile devices connected together via communications devices and transmission media, often wirelessly allowed computers to share resources (hardware, software, data & information).

Any type of hardware capable if transmtting data, instructions, and information between a sending device and a receiving device.

Modem : A device that enables a computer to communicate over analog networking media such as connecting the Intervet via telephone lines.

Wireless Modem : Modem that connects to the serial port but does not connect to telephone lines. It receives through the air.

Wireless Access Point : A device on a network that connects wireless devices to that network.

Router : A device that connects multiple networks together; routes packets to their next locationn in order to efficiently reach their destination.

Hub : The device that provides a common central connection point for nodes on network.

Switch : A device used to connect multiple devices on a single (typically wired) network, forward packets to only the intended recepient.

Network Interface Card : An adapter card that connects a computer to a network.

Wireless Network Interface Card : An adapter card through which a computer can connect to a network that provides wireless data transmission.

Repeater : A device that enhance the weaken signal and repeat it at its original strength,

The materials or substances capable of carrying one or more signals.

Physical : send signals through cable, wire or tangible materials.

Twisted-pair cable - physical transmission media which the cable consisting of pairs of copper wire that are twisted together.

 Coaxial cable - A networking cable consisting of center wire inside a grounded, cylindrical shield, capable of sending data at high speeds.

 Fibre Optic cable - Physical transmission media that consists of dozens or hundreds of thin strands of glass or plastic that use light to tansmit signals.

Wireless : send signals through the air or space.

Infrared - Send signals using infrared light waves from one device to another.

Microwaves - waves that provide a high-speed signal transmission using electromagnetic radio wave (P1 WiMax)

Cellular Radio - a form of broadcast radio that is in wide use for mobile communication

Broadcast radio - distributes radio signal through the air over long distances

Communication satellite - A space station that receives microwaves signals  from an earth-based station.

 bluetooth - a networking standard for every short-range wireless connections ; the devices are automatically connected once they get within the allowable range.