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第二十六讲. 10. 3 Internet 的接入. 从用户数量看, Internet 接入一般分为单机接入和网络接入两种方式。单机接入一般比较直观,只需按某种方法将计算机接入 Internet 即可;而网络接入比较复杂,它一般是团体用户在拥有内部网的情况下实现与 Internet 的连接,从而实现各种各样的网络服务。. 常用的具体的接入 Internet 的方式主要有:通过 LAN 接入、通过 Modem-- 电话线接入、通过仿真终端方式接入、通过专线 ISDN 接入通过 DDN 接入、通过 ADSL 接入和通过无线方式接入等。. 1. 通过 LAN 接入:

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第二十六讲

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10 3 internet

10. 3 Internet

  • InternetInternetInternet


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  • InternetLANModem--ISDNDDNADSL


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1. LAN

  • LANLANInternetLANInternet

  • ODI/ NDISTCP/IP


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2. Modem--

  • ModemInternetISPLANInternetModem


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  • Modem--InternetSLIPPPP

  • MODEMTCP/IPSLIP/PPP


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3.

  • PCPCCOMModemInternetPCInternetInternet


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  • MODEM

  • PCPC


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4. ADSL

  • ADSL640Kbps~1Mbps1Mbps~8M bps3~5km


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  • InternetPCADSL ModemWindows 95/98/XPTCP/IPIPDNS


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5. DDN

  • DDNModemDDNDDNDDNDDNDDNE1DDN


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6. ISDN

  • ISDN144kbps2B+DBD144KbpsISDN128kbpsB


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  • ISDNISDN

  • 2090ISDN1996ISDN


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  • ISDNISDNISDN128Kbps64 Kbps


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  • ITU-TISDN


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  • ISDNNT1NT1ISDNNT18


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TE1

ISDN

NT1

ISDN ISDN

T

U

ISDN


10 4 internet

10. 4 Internet

  • InternetInternet(E-Mail)(Telnet)(FTP)WWW(BBS)


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1.

  • E-mailInternet


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  • E-mailE-mailE-mailE-mailE-mail


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  • CS


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  • SMTPTCP/IPSMTP

  • POP


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SMTP

SMTP

POP3


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2.

  • Internet

  • TelnetInternet


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  • C/S


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  • TelnetTCP/IP Telnet


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3 .

  • InternetTCP/IPFTPFTP


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Internet

FTP


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  • FTPFTPFTPFTP


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  • FTP()FTPFTPFTPFTP


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  • InternetInternetFTPFTPFTPFTPAnonymousFTP


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4 . WWW

  • WWWInternetWWW


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  • WWWWebHTMLHTTPInternetWWWC/S


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  • HTTPInternetTCP/IPC/SWWW


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  • HTTP

  • WWWHTTPFTPTelnetGopherWAISInternet


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  • URLURLInternet

  • URL:///

    • http://www.sjtu.edu.cn/xxx.html


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  • Web


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5 . (BBS)

  • BBSInternetInternetBBSInternetInternet


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  • BBS

  • BBSInternet


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  • BBS/

  • BBSTelnetWWWWWWBBSIP BBSbbs.sjtu.edu.cnWWWBBS


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