BASIC CONCEPT OF NETWORK

DEFINITION 

• 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.

APPLICATIONS OF NETWORK

•           Resource Sharing

Ø  Hardware (computing resources, disks, printers)

Ø  Software (application software)

•            Information Sharing

Ø  Easy accessibility from anywhere (files, database)

Ø  Search Capability (www)

•  Communication

Ø  Email

Ø  Message board

COMMUNICATION DEVICES

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

TYPES OF COMMUNICATION DEVICES

• Dial-up Modem.
• Digital Modem (ISDN, DSL, Cable Modem).
• Wireless Modem.
• Network Card.
• Wireless Access Point.
• Router.
• Switch.
• Hub.

TRANSMISSION MEDIA

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

TYPES OF TRANSMISSION MEDIA

1. Physical transmission media/Guided media/Wired : Twisted-pair Cable, Coaxial Cable, Fiber-optic Cable.
2. Wireless transmission media/Unguided media : Infrared, Broadcast Radio, Cellular Radio, Microwave, Communications Satellite.