The data-link layer provides logical communications between adjacent node and adjacent node.
In the Open Systems Interconnection (OSI) model, the data link layer is the second layer. It connects two adjacent nodes in a network for the purpose of sending and receiving data. The nodes are said to be adjacent because, in some sense, they are connected. This adjacent connection could be either point to point or broadcast but exists on the same link.
The data link layer transfers the data between nodes across the physical layer in a network. The physical layer sends the data as raw bits from the sender’s hub to receiver’s hub. On the sender side, the data link layer first converts data stream bit by bit into signals and then sends it to the receiver’s side. Whereas, on the receiver side, the data link layer picks up the data which is in bit form, then assembles it in an understandable form, and then sends it to the upper layer.
It is the data link layer that identifies and corrects any errors existing in the communicated data before sending it to the upper layer. This is the service of the data link layer that to provide an error-free logical data transmission between adjacent nodes in a network.
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