what is meant by network in computer

What is meant by network ?

A group of system interconnect together is called Network.

A network is a connected collection of devices such as Switch,Router,Firewall,Hub etc which can communicate with each other.

Why should we do network ?

We do network for reducing our cost and time.

HUB

It is a multiport repeater,
It is not forward intelligence,
It cannot send the packet to exact computer always it broadcast
It allows collision signal and broadcast signal

Bridge

It block the collision from one segment to another segment (Hub to Hub)
It is a forward intelligence it maintain segment table
Segment table contain mac address of computer
It allows Broadcast signal

Switch

It is a multiport bridge
It is a forward intelligence it sent packet to exact computer,it maintain mac table on CAM
It blocks the collision using segmentation
It allows broadcast signal

Router

It is used to connect two different network
It forward the packet from one network to another using routing table
It forward intelligent it blocks collision signal and broadcast signal

Gateway

A gateway is a network node that connect two network using different protocols together
It also acts as a gate between two network
It may be a router,firewall,server or other devices that enable traffic to flow in and out of the network..

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