STAR TOPOLOGY

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In a star topology each device has a dedicated point to point link only two central controllers usually called a hub. The devices are not directly linked to one another.

A star topology does not allow direct traffic between devices.

If one device wants to send data to another, it sends the data to the controller which then relays to the other connected device.

High speed lanes tend to use star topology with a central hub.

Advantages

  1. A star topology is less expensive than the mesh topology
  2. Each device needs only one link and one IO port to connect it to any number of devices. This makes it to install and reconfigure.
  3. If the network has to be expanded or any nodes have to be deleted from the network it is easier because it involves only one connection between that device and hub.
  4. It is robust because one link fails only that link is affected. The other entire link remains active. This factor also leads to easy fault identification.
  5. As long as the hub is working it can be used to monitor link problem bypass defective link.

Disadvantages

  1. If the hub goes down the whole system gets dead.
  2. Although the star require less cable then the mesh, each node must be linked to a central hub for this reason often more cabling is required in star than in other topology.
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