The repeater works at the physical layer of OSI and is the center of all nodes on the LAN. Its function is to amplify signals, compensate for signal attenuation, and support long-distance communication. Repeater. Working in the physical layer, it only plays the role of extending the transmission distance and is transparent to the high-level protocol. In fact, the network connected by repeaters is equivalent to a larger network composed of the same wire. Repeaters can also connect networks of different transmission media (10Base5 and 10Base2) together, and are often used in the interconnection of the same LAN above the data link layer.

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).