It provides the physical transmission of data and
handles error notification, network topology and flow control i.e. The main
purpose of this layer provide a reliable method of transmitting data across the
physical media.
This layer break the input data into
FRAMES, transmits the frame sequentially and process the acknowledged frames
sent back by the receiver.
The data link layer is divided into two sublayers
v Media Access Control (MAC)
layer - responsible for controlling how computers in the network gain access to
data and permission to transmit it.
v
Logical Link Control (LLC) layer - control
error checking and packet synchronization.
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