Hub is just a multi-port signal amplification device. When a port receives a data signal in operation, the signal has been attenuated in the transmission process from the source port to the hub, so the hub shapes and amplifies the signal to regenerate (restore) the attenuated signal to the state when it was sent, and then forwards it to all other ports in operation.

Uses are as follows:

Hub is mainly used to set up a * * * shared network, which is the most economical scheme to directly solve the problem from server to desktop. In a switched network, the hub is directly connected to the switch and sends the data of the switch port to the desktop. Hub networking is flexible. It is located on a star node of the network, and centrally manages the workstations connected to the node, so that the faulty workstations will not affect the normal operation of the whole network, and users can freely join and quit.

Hub belongs to the bottom equipment of pure hardware network, and basically does not have the ability of "intelligent memory" and "learning" similar to switches. It also has no MAC address table owned by the switch, so it sends data by broadcast, not as a target. That is to say, when it wants to send data to a node, it does not send data directly to the destination node, but sends data packets to all nodes connected to the hub, which is simple and clear.