What is a hub?

Last update on May 17, 2009 07:25 AM by jak58
Published by jad05

What is a hub?






I guess you have seen a hub, in the office and even at home having a local area network.

What is a hub?


This is an equipment which works on the 1 OSI model layer which allows you to connect more than one computer (client) on a network. Most of them are used at home and offices. It acts as a concentrator or a repeater hub, a junction point of a network which does the transferring of data. It regroups the flows on its network ports, and, regardless of the host transmitters / receivers, it returns all the flows on the network!

How does it work?


A HUB only transfers equally and non selectively frames to all connected devices. Thus contrary to the switch, it does not keep stored in a table, the addresses of recipients. It is not designed to decode the header of the packet to find the IP address of the recipient.
The establishment of a hub network surcharge thus returning all the frames in the machines connected.
That is why one can find a hub on a network but only as part of a plan.

Other uses of the Hub concept


The hub concept is is now used in small USB enclosures, available from all computer dealers, offering more ports for connecting various peripherals.
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