3 4 (a) (b) (c) (d) 3 (a) 4 (b) 7 MSCMSCMSC — , () ()DDN() (Internet) 6.2 TCP/IP12345 6.2 48(ROM)IEEE(Media Access Control, MAC) 6.2 6.2 A B b IBM 6.2 ()100-1000Mbps10-100Mbps IEEE802 OSI(TCP/IP) 6-1 IEEE802 6.3 ——Novell NetwareMicrosoftWindows NT ——HPOpenViewIBM NetView —— Notes/Domino 6.4 6.4 , (Modem) ---ZHANGXM ADSL(Asymmetric Digital Subscriber Line)(ISP)8Mbps(ISP)1Mbps 6.4 ADSL512Kbps 56K1M2MADSL 6.4 ISDNISDNISDNISDN ISDN 6.4 WDP (Wireless Datagram Protocol) : ATM Cell()ATM 6.4 ATM ATM 6.4 6.4 :. 6.4 • FTP (File Transfer Protocol) • DNS(Domain Name System) TCP IP 6.5 A B C D E A (A) (B) C 192.0.0.0223.255.255.255 (C) : 210.39.0.35 C(192.0.0.0223.255.255.255) 10 (a) (b) 6.5 10 (a) (b) ,, Web InternetWeb; WebWeb(); 6.5 6.5 6.5 “”> “Internet”> “”> “”“”“”“”“” —“” 6.5 “Internet” “” “”> “” “”“,”“”HTML “”“,HTML”“”“” “”“” 6.5 Outlook ExpressISPEmailPOP3Outlook Express InternetOutlook Express “”“”“” E-mail“”“”“”“”() Outlook Express“”“”“”“”E-mail FTP(Upload)(Download) Web (2)IP 179XY 6.5 6.5 — google 6.6