Definition :

• All the computers and other devices on the network connect to a central device (hub/switch), thus forming a star.
• Two types of devices that provide a common central connection point to all the other devices on the network are a hub and a switch.
  

• In a star network, data, instructions and informations transfer from one node to another node passes through hub / switch.
• If the network used hub, the signal will send to all nodes but only the intended recipient will accept the signal and the rest will ignore.
• If the network used switch, the signal will send directly to the intended recipient.

Disadvantages :

1. If the hub or switch fails, the entire network will be malfunction.

2. Requires more cable than most of the other topologies.