MAC Sub Layer and LAN

May 5th, 2015
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Medium Access Control role of MAC is to resolve the contention for the shared media between adjacent nodes. Lower sub layer of Data link layer. Contains the synchronization, flag flow physical address of next station and error control specifications necessary to move information from one place to another.

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MAC Sub Layer and LANMedium Access Control(MAC) Sub-Layer and LANMedium Access Control role of MAC is to resolve the contention for the shared media between adjacent nodes. lower sub layer of Data link layer contains the synchronization, flag flow physical address of next station and error control specifications necessary tomove information from one place to another. functions of MAC sub layer are the media access control, error detection and station addressing. the physical transmission medium of a LAN is shared by the stations connected on the LAN. media access control procedures are implemented to ensure that every station gets a fair chance to transmit and collision do not take place. there are several methods of media access control in LANs. Each method is applicable to specific LAN topology. the MAC layer also handles the frame delimiting, address recognition and error checking functions.Sharing a transmissionmediumMedia SharingStatic allocationDynamic medium accesscontrolSchedulingRandom AccessMultiple Access Communication When a number of user stations share a single transmission medium. The transmission medium is broadcast in nature, so all other attached stations to the medium can receive the transmission from any given station.The Channel Allocation Problem There are two schemes to allocate a single channel among competing users:1) Static Cha

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