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..