Computer Network

WHAT IS NETWORK?

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

Basic Concept of network

•the connections between computers in a network are made using physical wires or cables.

•some connections are wireless, using radio waves or infrared signals.

Applications 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

WHAT IS communication devices?

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

Types of communication devices

DEVICES	DESCRIPTION	IMAGES
Dial-up modem	can convert digital signals to analog signals and analog signals to digital signals,
Digital modem	can convert digital signals to analog signals and analog signals to digital signals,
Wireless modem	connect to the Internet wirelessly from a notebook computer, a smart phone, or other mobile device.
Wireless access point	central communications device that allows computers and devices to transfer data wirelessly
Router	A communications device that connects multiple computers or other routers together and transmits data
Switch	A connection device similar to a hub but more sophisticated,
Network card	a communications device that enables a computer or device that does not have built-in networking capability to access a network.
Hub	A connection device that allows multiple connections to the network