Internet Technology :)

What is a network?

A network is a collection of computers and devices connected together via communications devices and transmission media.

Basic concept of network.

•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.

Application of network.

•Resource Sharing

qHardware (computing resources, disks, printers)

qSoftware (application software)

•Information Sharing

qEasy accessibility from anywhere (files, databases)

qSearch Capability (www)

•Communication

qEmail

qMessage broadcast

Network perspective

Based on transmission media
Based on network size
Based on management method
Based on topology

Communication device

A communications device is any type of hardware capable of transmitting data, instructions, and information between a sending device and a receiving device.

Dial-up Modem

A communications device that can convert digital signals to analog signals and analog signals
to digital signals, so that data can travel along an analog telephone line.

Digital Modem (ISDN,DSL, Cable Modem)

A communications device that sends and receives data and information to and from a digital

line.

Wireless Modem

Some mobile users have a wireless modem that uses the cell phone network to connect to

the Internet wirelessly from a notebook computer, a smart phone, or other mobile device.

Router

A communications device that connects multiple computers or other routers together and

transmits data to its correct destination on a network.

Switch

A connection device similar to a hub but more sophisticated, including functionality that

allows it to control and manage data transmissions.

Hub

A connection device that allows multiple connections to the network.

TRANSMISSION MEDIA

Materials or substances capable of carrying one or more signals in a communications

channel.