The LAN only involves the functions of the physical layer and the data link layer in the communication subnet, it is the data communication problem between nodes and nodes in the same network, not the network layer. The function of the data link layer is divided into two sub-layers of media access control MAC and logical link control LLC in the LAN reference model, and the LLC sub-layer is independent of the transmission medium used, only allowing the MAC sub-layer to handle media access control methods according to the physical media. The high-level function of LAN is implemented by the network operating system
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