The repeater is used to extend the network distance in the LAN environment, but it belongs to the network interconnection equipment, and operates on the physical layer of OSI. The repeater has the function of amplifying and regenerating the signal on the line, and is used to extend the length of the LAN segment (only used to connect the same LAN segment).

Repeaters are connecting devices that work on the physical layer. It is applicable to the interconnection of two identical networks. Its main function is to expand the network transmission distance by retransmitting or forwarding data signals. Repeaters are network devices that regenerate and restore signals: physical layer devices of OSI model.