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Wednesday, September 30, 2020

Functions of Data Link Layer

Ø  Data Link Control

Data Link Control is the service provided by the Data Link Layer to provide reliable data transfer over the physical medium. 

For example, In the half-duplex transmission mode, one device can only transmit the data at a time. If both the devices at the end of the links transmit the data simultaneously, they will collide and leads to the loss of the information. 

The Data link layer provides the coordination among the devices so that no collision occurs.

The Data link layer provides three functions:

  • Line discipline
  • Flow Control
  • Error Control

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