IEEE

IEEE started a project, called project 802, to set the standards to enable communication among equipment from a verity of manufactures. The IEEE has subdivided the data link layer into two sub layers. Logical link control and media access control. IEEE has created several physical layers standards fro the different LAN protocols. The purpose of LLC is to provide flow and error control fro the upper layer protocols. MAC defines the specific access method for Ethernet LANs. In contrast to the LLC sub layer, the MAC sub layer contains a number of distinct modules; each defines the access method and the framing format specific to the corresponding LAN protocol.