computer network

WHAT IS COMPUTER NETWORK

TODAY TOPIC ,1-FEB-2019

hello friends  I ABHAY MISHRA today we discuss about computer network ..

so how we do that are following ways .

Computer Network :

A computer network is a system in which multiple computers

are connected to each other to share information and resources.

A Network in the world of computers is said to be a collection

of interconnected hosts, via some shared media which can be

wired or wireless. A computer network enables its hosts to

share and exchange data and information over the media.

Network can be a Local Area Network spanned across an

office or Metro Area Network spanned across a city or Wide

Area Network which can be spanned across cities and

provinces. Computer network can be as simple as two PCs

connected together via a single copper cable or it can be grown

up to the complexity where every computer in this world is

connected to every other, the Internet. A network then includes

more and more components to reach its ultimate goal of data

exchange.

Characteristics of a computer network

 Share Resources from one computer to another

 Create files and store them in one computer, access those files from the other computer(s) connected over the

network

 Connect a printer, scanner, or a fax machine to one computer within the network and let other computers of the

network use the machines available over network.

The list of hardware's required to a computer network.

Hosts - Hosts are said to be situated at ultimate end of the network, i.e. a host is a source of information and another

host will be the destination. Information flows end to end between hosts. A host can be a user’s PC, an internet

Server, a database server etc.

Media - If wired, then it can be copper cable, fiber optic cable, coaxial cable or if

wireless, it can be free-to-air radio frequency or some special wireless band. Wireless

frequencies can be used to interconnect remote sites too.

Hub - A hub is a multiport repeater and it is used to connect hosts in a LAN segment.

Because of low throughputs hubs are now rarely used. Hub works on Layer-1 (Physical

Layer) of OSI Model.

Ethernet :- Ethernet, pronounced "E-thernet" is the standard way to connect computers on a network over a wired

connection. It provides a simple interface and for connecting multiple devices, such computers, routers, and switches.

With a single router and a few Ethernet cables, you can create a LAN, which allows all connected devices to

communicate with each other.

A standard Ethernet cable is slightly thicker than a phone cable and has an RJ45

connector on each end. Ethernet ports look similar to telephone jacks, but are slightly

wider. You can plug or unplug devices on an Ethernet network while they are powered on

without harming them.

NOTE: Ethernet is also known by its technical name, "IEEE 802.3."

by abhay mishra ...

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