Chii chakasikwa nenzvimbo yakaitwa nedzimwe nzvimbo mbiri? Tichifunga nezvemubvunzo wapfuura, nyora mashoko akapoteredza mhinduro yacho. Inogona kuva mitsara 1 - 20. Mashoko akapoteredza:
Paiva nemarudzi maviri enetwork dzeX.25. Vamwe vakadai DATAPAC uye TRANSPAC vakanga pakutanga chinozoiswa ane X.25 kwokunze inowanikwa. Mamwe maratidziro ekare akadai seTELENET neTYMNET akagadziridzwa kuti ape X.25 host interface mukuwedzera kune ekare masisitimu ekubatanidza masisitimu. DATAPAC yakagadzirwa neBell Northern Research yaive mubatanidzwa weBell Canada (mutakuri akajairika) uye Northern Telecom (mutengesi wemidziyo yenhare). Northern Telecom yakatengesa DATAPAC clones dzakawanda kune dzimwe nyika PTTs kusanganisira Deutsche Bundespost. X.75 uye X.121 akabvumira interconnection yenyika X.25 network. A mushandisi kana hondo aigona kudana hondo pamusoro yokumwe network kuburikidza kusanganisira DNIC ari kure samambure sechikamu kuenda kero. [ citation inodiwa ]