Wednesday, 3 February 2021


What is Hub?

Hub is a physical layer device (layer 1) it is a Dummy Device. It works with broadcasting and shared bandwidth. It has one broadcast domain and one collision domain and therefore collisions are identified using Access Methods called CSMA/ CD and CSMA/ CA.

Network Hub

Broadcast Domain and Collision Domain

Broadcast Domain

It is a logical division of a computer network, in which a set of all devices that receive broadcast frames originating from any device within the set and therefore it can be bridge to other LAN segments or within the same LAN segment.

Collision Domain

In Ethernet, the network area within which frames that have collided are propagated is called a collision domain. However, it is a network segment with two or more devices sharing the same bandwidth. Therefore the repeaters and hubs propagate collisions, LAN switches, bridges, and routers do not.

Types of Hubs

  • Active Hubs
  • Passive Hubs
  • Intelligent Hubs

Active Hubs

It uses the power supply and it has electronic circuitry to regenerates the data that strengthen the signals in case of disturbances or regenerate weak signals.

Passive Hubs

It does not use a power supply and it will not regenerate the data that do not strengthens the signals in case of disturbances and it is used only to share physical media.

Intelligent Hubs

It is a smart hub and these devices basically function as active hubs, but also include a microprocessor chip and diagnostic capabilities and are useful in troubleshooting situations.

Also Learn about Router


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