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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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