What is the function of Data Link layer in OSI model?

Data Link Layer :

Data Link Layer functions include –

  • Framing : It divides the stream of bits received from the Network Layer into manageable data units called Frames.
  • Physical Addressing : Adding header to the frame to define the physical address of the sender or receiver of the frame.
  • Flow Control : If the rate at which the data is absorbed by receiver is less than that of sent from the sender, flow control mechanism is used to prevent the loss of data.
  • Error Control : DLL adds functionality to detect and re-transmit the damaged, lost or redundant frames.
  • Access Control : DLL helps in controlling the access to the shared channel.
  • Transmission unit is Frames

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