Data-Link Layer

The Data-link layer enables node-to-node delivery of data in a network by converting bit streams received from the Network layer into manageable units. These units are called frames. A header is added to each frame to generate the physical address of the source and destination nodes. To maintain consistent rates of data transmission between the source and destination, the Data-link layer applies the flow control mechanism. This mechanism is a precautionary measure to ensure that the bit stream sent by a fast source node does not flood the destination node.