Kusiyana kofunikira pakati pa awosanjikiza-2 kusinthandi a wosanjikiza-3 kusinthandikuti gawo la protocol yogwira ntchito ndi yosiyana. Kusintha kosanjikiza-2 kumagwira ntchito pa ulalo wa data, ndipo switch-3 imagwira ntchito pa network network.

Itha kumveka ngati chosinthira cha 2. Mutha kuganiza kuti imangokhala ndi ntchito yosinthira, ndiye kuti, imatha kukonza mafelemu a data. Kuphatikiza pa ntchito yosinthira 2, chosinthira cha 3 chimakhalanso ndi gawo la 3, zomwe zikutanthauza kuti zimatha kukonza deta. Chikwama.

(1)Zosintha za Layer 2 gwirani ntchito pagawo lachiwiri la data link lachitsanzo cha OSI. Ntchito zazikuluzikulu zikuphatikiza maadiresi akuthupi, kuyang'ana zolakwika, kutsatizana kwa chimango, ndi kuyendetsa bwino.

(2) Awosanjikiza-3 kusinthandi chipangizo ndi wosanjikiza-3 kusintha ntchito, ndiye, wosanjikiza-2 lophimba ndi wosanjikiza-3 routing ntchito, koma ndi organic kuphatikiza awiri, osati rauta chipangizo hardware ndi mapulogalamu Superimposed pa LAN lophimba. .