Computer Network

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ABOUT COMPUTER NETWORK

What is network?

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

COMMUNICATIONS DEVICE & TRANSMISSION MEDIA

What is 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.

What is transmission media?

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

COMMUNICATION DEVICE

Devices	Description
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.
Network card	Sometimes called a network interface card, is a communications device that enables a computer or device that does not have built-in networking capability to access a network.
Wireless access point	A central communications device that allows computers and devices to transfer data wirelessly among themselves or to transfer data wirelessly to a wired network .
	*Wireless access points have high-quality antennas for optimal signals.
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.