Data Link Layer & Flow Control

         Data link Layer & Flow Control- Data link layer is layer 2 in OSI model. It is responsible for communications between adjacent network nodes. It handles the data moving in and out across the physical layer. It also provides a well-defined service to the network layer. Data link layer is divided into two sub layers. The Media Access Control and logical Link Control, Data-link layer ensures that an initial connection has been set up, divides output data into data frames, and handles the acknowledgments from a receiver that the data arrived successfully. It also ensures that incoming data has been received successfully by analyzing bit patterns at special places in the frames. In the following sections data link layer’s functions error control and Flow Control has been discussed. After the layer 2 is explained. Multiple access protocols are explained in the layer 2 section.

Flow Control is one important design issue for the Data Link Layer that controls the flow of data between sender and receiver. In communication, there is communication medium between sender and receiver. When Sender sends data to receiver than there can be problems.