What is the difference between star topology and mesh topology ?

 What is the difference between star topology and mesh topology ? 

In the star topology :
star topology
  • In a star topology, each device has a dedicated point-to-point link only to a central controller  usually called a hub.
  • The devices are not directly linked to one another. Unlike a mesh topology.
  • a star topology does not allow direct traffic between devices.
  • The controller acts as an exchange:
  •  If one device wants to send data to another, it sends the data to the controller, which then relays the data to the other connected device .
  • A star topology is less expensive than a mesh topology.
  •  In a star, each device needs only one link
  • and one I/O port to connect it to any number of others.
In a mesh topology :
Mesh Topology 
  • every device has a dedicated point-to-point link to every other device.
  • The term dedicated means that the link carries traffic only between the two devices it connects.

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