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What is the difference between star topology and mesh topology ?

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  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.   😉thank you all my friends 
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