A.網(wǎng)絡(luò)層 B.傳輸層 C.應(yīng)用層 D.網(wǎng)絡(luò)接口層
A.5 B.6 C.7 D.8
A.協(xié)議轉(zhuǎn)換問(wèn)題 B.傳輸服務(wù)問(wèn)題 C.網(wǎng)絡(luò)信道問(wèn)題 D.應(yīng)用進(jìn)程的通信問(wèn)題