This layer is the heart of the whole
protocol hierarcy. Its task is to provide reliable cost-effective data
transport from the source machine to destination machine, Independently of the
physical network or network currently in use . It is upper layer of OSI model.
IN this
layer flowing operation is perform :-
Packet & sequencing ,
flow control, error control, Multiplexing, End to End delivery Addressing ,
Loss control.
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