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A hub is a common connection point for devices in a network. Hubs are devices commonly used to connect segments of a LAN. The hub contains multiple ports. When a packet arrives at one port, it is copied to the other ports so that all segments of the LAN can see all packets.

Sometimes, hubs are also called: 
  • Ethernet Hub 
  • Repeater Hub
  • Active Hub
  • Network Hub

Types of Hub: 
  • Active Hub
  • Passive Hub
  • Intelligent Hub
Active hub: Active Hub is a hub which can amplify or regenerate the information signal. 

Passive hub: It is used for just creating a connection between various devices. It does not have the ability to amplify or regenerate any incoming signal. It receives a signal and then forwards it to multiple devices.

Intelligent hub: It can perform tasks of both Active and Passive.