1 votes 1 votes Can anyone please explain this? Computer Networks computer-networks data-link-layer network-layering + – Nisha Bharti asked Sep 22, 2022 • retagged Sep 22, 2022 by makhdoom ghaya Nisha Bharti 781 views answer comment Share Follow See all 0 reply Please log in or register to add a comment.
0 votes 0 votes $number\ of\ times\ a\ packet\ visits\ network\ layer$ $ 1\ source\ +\ 1\ router\ +\ 1\ destination\ =\ 3$ $ number\ of\ times\ a\ packet\ visits\ data\ link\ layer$ $ 1\ source\ +\ 2\ router\ +\ 1\ destination=4$ afroze answered Sep 22, 2022 afroze comment Share Follow See all 5 Comments See all 5 5 Comments reply Nisha Bharti commented Sep 22, 2022 reply Follow Share I want to ask that in router why DLL,PL is 2 & NL is 1? 0 votes 0 votes afroze commented Sep 22, 2022 reply Follow Share 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. 0 votes 0 votes Nisha Bharti commented Sep 22, 2022 reply Follow Share Still i didn't visualized. 0 votes 0 votes afroze commented Sep 22, 2022 reply Follow Share 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 1 votes 1 votes jdarshan5 commented Dec 19, 2022 reply Follow Share In router the packet goes like (Bottom To Up) physical link → DLL → NL (Now Top to Bottom) → DLL → physical link, that’s it. If you are thinking that the packet is going in the NL only one time but not two time, now think why would you want your packet to go twice in the NL. Please also consider in your mind the concept of adding or removing header from each layer. 0 votes 0 votes Please log in or register to add a comment.