LOCAL AREA NETWORKS. MEDIUM ACCESS CONTROL All LANs and MANs consist of collections of devices that must share the network’s transmission capacity. Some.

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Presentation transcript:

LOCAL AREA NETWORKS

MEDIUM ACCESS CONTROL All LANs and MANs consist of collections of devices that must share the network’s transmission capacity. Some means of controlling access to the transmission medium is needed to provide for an orderly and efficient use of that capacity. This is the function of a medium access control (MAC) protocol.

MEDIUM ACCESS CONTROL Multiple Access consider the data link layer as two sublayers. The upper sublayer is responsible for data link control, and the lower sublayer is responsible for resolving access to the shared media.

MEDIUM ACCESS CONTROL The upper sublayer that is responsible for flow and error control is called the logical link control (LLC) layer; the lower sublayer that is mostly responsible for multipleaccess resolution is called the media access control (MAC) layer.

MEDIUM ACCESS CONTROL In multipoint networks. Many formal protocols have been devised to handle access to a shared link

MEDIUM ACCESS CONTROL Random Access In random access or contention methods, no station is superior to another station and none is assigned the control over another. No station permits, or does not permit, another station to send. At each instance, a station that has data to send uses a procedure defined by the protocol to make a decision on whether or not to send. This decision depends on the state of the medium (idle or busy).

MEDIUM ACCESS CONTROL In other words, each station can transmit when it desires on the condition that it follows the predefined procedure, including the testing of the state of the medium. Two features give this method its name. First, there is no scheduled time for a station to transmit. Transmission is random among the stations. That is why these methods are called random access. Second, no rules specify which station should send next.

MEDIUM ACCESS CONTROL Stations compete with one another to access the medium. That is why these methods are also called contention methods. In a random access method, each station has the right to the medium without being controlled by any other station. if more than one station tries to send, there is an access conflict-collision-and the frames will be either destroyed or modified. To avoid access conflict or to resolve it when it happens, each station follows a procedure that answers the following questions:

MEDIUM ACCESS CONTROL When can the station access the medium? What can the station do if the medium is busy? How can the station determine the success or failure of the transmission? What can the station do if there is an access conflict?