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why data link layer is divided into two sublayers

Data link layer is devided into two sublayers. 

Logical Link Control (LLC) sublayer provides the logic for the data link. 
Thus, it controls the synchronization, flow control, and error checking
functions of the data link layer.

Media Access Control (MAC) sublayer provides control for accessing 
the transmission medium. It is responsible for moving data packets from 
one network interface card (NIC) to another, across a shared 
transmission medium. Physical addressing is handled at the MAC sublayer. 
MAC is also handled at this layer.
Posted by: Guest on August-06-2021

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