A.物理層,連接層,應(yīng)用層 B.物理層,控制層,連接層 C.控制層,連接層,應(yīng)用層 D.連接層,網(wǎng)絡(luò)層,應(yīng)用層
A.TMSI ALLOCATION B.AUTHENTICATION REJECT C.ASSIGNMENT COMMAND
A.LEVEL 3 B.LEVEL 1 C.LEVEL 2