I am bit confused about this question,Network itself one of
the Layer in OSI model if am not wrong,and there is no sub
layers as such in network layer
However Network layer is called as layer 3 in OSI model
and it works on packed level
frahatu first of all read OSI layer seriously.
Network layer is also called Layer 3 of OSI model used for
routing purpose.It is itself one of the layer, so how can u
ask without knowing this. I think by mistake u write this.
Just keep in ur mind that Network layer is the third layer
of OSI layer Arcitecture