Chii chisingachashandiswi pamwero wenetwork? Tichifunga nezvemubvunzo wapfuura, nyora mashoko akapoteredza mhinduro yacho. Inogona kuva mitsara 1 - 20. Mashoko akapoteredza:
Vose X.25 uye Frame Relay zvinopa kubatana-zvinangwa akavhiyiwa. Asi X.25 inozviita pane network layer yeOSI Model. Frame Relay inozviita padanho rechipiri, mwero wekubatanidza mashoko. Chimwe musiyano mukuru pakati X.25 uye Frame Relay ndechokuti X.25 kunoda ruoko pakati kutaura mapato pamberi chero User packet vari dzakatamisirwa. Frame Relay haitsananguri kubata maoko kwakadaro. X.25 haitsananguri zviito mukati mepacket network. Inoshanda chete pamushandisi-network-interface (UNI). Nokudaro, mupi wenetwork akasununguka kushandisa mutoo upi noupi waanoda mukati menetwork. X.25 inotsanangura dzimwe nzira dzinotenderwa dzokutumira zvakare paUNI, uye link layer protocol yayo (LAPB) inopa nzira dzekare dzeHDLC-type link management. Frame Relay ishanduro yakashandurwa yeISDN's layer two protocol, LAPD neLAPB. Nokudaro, kuvimbika kwaro kunoshanda chete pakati pemakona ari pachibvumirano, kwete kumagumo-kumagumo. Chero kutumirazve kunofanira kuitwa nemitemo yakakwirira. The X.25 UNI dzakati chikamu X.25 dzakati Suite, iyo ine yakaderera matatu akaturikidzana ose OSI Model. Yakanga ichishandiswa zvikuru paUNI nokuda kwepaketi yekushandura mitambo mukati me1980s uye kutanga kwe1990s, kupa hurukuro yakagadziriswa mukati uye kunze kwepaketi yemagetsi. Mamwe mashandisirwo akashandisa X.25 mukati memambure zvakare, asi hunhu hwayo hwekubatanidza-hwakaita kuti gadziriro iyi ive inorema uye isingashande. Frame relay inoshanda zvikurukuru pamwero wechipiri weOSI Model. Zvisinei, kero yayo munda (Data Link Connection ID, kana DLCI) inogona kushandiswa pa OSI network layer, ine mashoma seti yemaitiro. Nokudaro, rinosunungura pacharo zhinji X.25 rukoko 3 encumbrances, asi achine DLCI somunhu ID mhiri node-kuti-node rukoko maviri kubatana dzakati. Kupfava kweFram Relay kunokuita kuti kukurumidze uye kunobudirira zvikuru kupfuura X.25. Nemhaka yokuti Frame relay inonzi data link layer protocol, yakafanana neX.25 haitsananguri mashandiro emukati ekufambisa network. Nokuda kweX.25 maID ayo emapakeji --- mavhidhiyo echirongwa uye nhamba dzomugwagwa chaiwo dzinofanira kuwirirana ne...