4 /

4.1 DNSDomain Name System 12IP3IP

1

2 jackjack.acm.orgacm.orgjack

63255NICNICCNNICwww.cnnic.net.cn

CCNIC

E-mailE-mailE-mail""

20024

20021-4

CCNIC

P1584-5

123

DNSflits.cs.vu.nllinda.cs.yale.eduIP

8

cs.vn.nlUDPedu

edulinda.cs.yale.educs.yale.eduyale.eduyale.educs.yale.edulinda.cs.yale.educs.yale.edu

Windows 95/98/NTTCP/IPDNSDNSP161 4-7

CPUSunUNIXSolarisBind

1named.confnamed/etc2named.ca3named.hostsnamed.revnamed.local4in.namednslookup

/21234.2

12TCP/IPUNIXWindows NTLinuxNovell NetWare

3C/SWWWFTP4

P171 4-9P172 4-10

LAN123456WAN

Electronic mail 4.3 E-mail

OutlookTCPIPSMTPPOP IMAP

1SMTPSample Mail Transfer Protocol

2 POP3Post Office Protocol

OutlookPOP3SMTP

POP3SMTP

IMAPInternet Message Access ProtocolPC

1header2body

1P175Outlook Express

123

ReceivedDateFromToSubjectX-mailerMime-VersionContent-TypeMessage-Id

1hyper textlinkancorlinkancor 4.4 WWW

2HTTPHyper Text Transport ProtocolWWWWWWHTTPTCP http://www.jmtvu.net

3URLUniform Resource LocationURL: http://www.jmtvu.net/pweb/lb/index.asp: //://

4HTML,TagHTML

HTML Word FrontPage Dreamweaver

HTMLHTML

:H1H6

5WWWHTMLIE 5.0Commaunicator 4.0

WWW1WWW2WWW3HTTP

InternetWebabc.comWebxyz.comHTTPTCPHTTPHTTP

:WWWURLhttp://www.jmtvu.net/pweb/lb/index.html1URL2DNSwww.jmtvu.netIP3DNS172.16.0.14172.16.0.180TCPTCP

5WWWGET /pweb/lb/index.htmlHTTP6 www.jmtvu.netindex.html7TCP8index.html9index.html

Internet Explorer Internet Explorer1Web2 3InternetInternet Explorer

3

123Word

123

Internet12InternetInternet

4567

Internet

Yahoo1

2

3

4.5 FTPTelnet Telecommunication network protocol1TCP/IPInternet

2Telnet TelnetTelnet TelnetTCP/IP InternetIP UserID

Telnet TCP TCP

Telnet TCP

3telnettelnet

12Internet3Telnet4

File Transfer Protocol1

TCP/IPdownload upload

2/C/SClientServerFTPTCPFTP21

FTPTCP/IP

FTPFTP

FTPTCPControl ConnectionFTPData Connection

3 FTP FTP FTP

4.6 BBS123

USENETInternetInternetUsenet,Internet,Newsgroup,InternetInternetUsenet,Netscape,Usenet

USENETUsers networkUSENETUSENETOutlook ExpressP146-148

IRCICQ 1WebchatHTML

2OICQOICQInternetOpenICQOICQOICQNextOICQ

2OICQOICQInternetOpenICQOICQOICQNextOICQ

:http://www.hongen.com/pc/tools/nettool/chat/oicq/oicq0101.htm

3(NetEase)http://popo.163.com

IPhone1IPIPTCP/IPUDPUDP

2IPPCPCInternetIPhoneVoxPhoneNetMeetingMediaring TalkCool TalkPCPCIPNet2PhoneIPhone

IPIP17951+

3IPVoxPhonehttp://www.voxware.comNet2Phonehttp://www.net2phone.com.cnIPhone5http://www.xjh.com.cn/xiazaizhuangqu.htm

VODMPEG

MPEGMoving Picture Expert Group1988MPEG-1MPEG-2VCDDVDMPEG-4MPEG-7MPEG-21

VR

P248-2491~46~8 4