Medium access control is a data communication protocol in seven layers OSI model. Medium access control is a sub layer situated in data link layer of the OSI reference model. Medium access control is executed by medium access controller. Most often, Medium access control acts as a boundary between logical link layer and physical layer of OSI reference model and provides channel access as well as addressing technique amongst multiple networks.

In a multipoint network setup, medium access control sub layer acts as full-duplex logical communication channel. CSMA/CD, Token bus, Token ring, Token passing, Slotted ALOHA, Dynamic TDMA, CDMA, Reservation ALOHA, Mobile Slotted Aloha are few of the examples of Medium access control protocol.

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