應(yīng)用層,表示層,會話層,傳輸層,網(wǎng)絡(luò)層,數(shù)據(jù)鏈路層,物理層
HSTP-DC1; LSTP-DC2、DTM、DL,當(dāng)DC1兼做DC2時,LSTP-DC1