Network Devices

1: LAN Card (Local Area Network Card)
It is also called NIC (Network Interface Card). It is used to connect a computer to a Local Area Network. LAN cards are available in different port like AUI, BNC and RJ45.

2: MODEM (Modulator and Demodulator)
It is used for conversion of digital data into analog data (modulation) and analog data in digital data (demodulation).it is used to connect a computer to inter network via telephone line it has RJ 11 port.
3: HUB
It is a centralized device .it is used to make a link between different computers in star topology. It has no addressing scheme. It is used to broad cast the data. It takes the data from one computer and sends that to all other computer, and then at last the destination computer receives the data.
3: Switch
It is used as a centralized device in star topology. All computer are connected with each other via switch in star topology .it has addressing scheme. It is used to unicast the data. It takes the data from one computer and sends that data direct to the destination computer.
4: Router
It is used to connect different Network with each other. It is used in MAN and WAN to connect two remote access Networks .In WAN every Network should has a Router. We connect a computer to the router with the help of roll over cable in order to configure the Router by the help of IOS (Inter Network Operating System).