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Can anyone please explain this?

$number\ of\ times\ a\ packet\ visits\ network\ layer$

$1\ source\ +\ 1\ router\ +\ 1\ destination\ =\ 3$

$number\ of\ times\ a\ packet\ visits\ data\ link\ layer$

$1\ source\ +\ 2\ router\ +\ 1\ destination=4$
by

I want to ask that in router why DLL,PL is 2 & NL is 1?
A Router is network layer device.

When a packet travels from source to destination it starts from top to bottom layer at source and visits 1 time network layer and 1 time DLL.

At router packet goes bottom to top and after that top to bottom bcoz it's router so packet to be returned from network layer and visits 1 time network layer and 2 times DLL.
Still i didn't visualized.
See at router packet is 2 times crossing DLL once bottom to top and 2nd top to bottom it is given in diagram

Still problem then ping me GO telegram group wl share image there

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