baɪ kˈɑːntɹæst, ɐn ɪntˈɪɹiɚ ɡˈeɪtweɪ pɹˈoʊɾəkˌɑːl ɪz ɐ tˈaɪp ʌv pɹˈoʊɾəkˌɑːl jˈuːzd fɔːɹ ɛkstʃˈeɪndʒɪŋ ɹˈaʊɾɪŋ ˌɪnfɚmˈeɪʃən bᵻtwˌiːn ɡˈeɪtweɪz kˈɑːmənli ɹˈaʊɾɚz wɪðˌɪn ɐn ɔːtˈɑːnəməs sˈɪstəm fɔːɹ ɛɡzˈæmpəl, ɐ sˈɪstəm ʌv kˈɔːɹpɚɹət lˈoʊkəl ˈɛɹiə nˈɛtwɜːks.
By contrast, an interior gateway protocol is a type of protocol used for exchanging routing information between gateways (commonly routers) within an autonomous system (for example, a system of corporate local area networks).