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1、TheUniversityofTexasatDallasErikJonssonSchoolofEngineering&ComputerScienceAPPLICATIONLAYERTECHNOLOGIESNotespreparedforEE6345byProfessorCyrusD.Cantrell,P.E.August–December2007cC.D.Cantrell(11/2007)THEUNIVERSITYOFTEXASATDALLASErikJonssonSchoolofEngineeringandCo
2、mputerScienceDOMAINNAMESYSTEM(DNS)•References:RFCs1034–5,1101,1123,1183,1348,1383,1401,1535–7,1611-2,1637,1664,1706,1712–3,1794,1886,1912,1995–6,2052,2065,2136,2136–7,2163,2168,2181–2,2219,2230,2308,2517,2535–2541,2606,2671–3,2692,2782,2826,2845,2874,2915–6,2
3、929–31,3007–8,3071,3090,3110,3123,3130,3197,3225–6,3363–4,3403,3467,3596–7,3645–6,3655,3757,3832–3,3845,3901DNSandBIND,3rded.,byPaulAlbitzandCricketLiu(O’Reilly)cC.D.Cantrell(11/2004)THEUNIVERSITYOFTEXASATDALLASErikJonssonSchoolofEngineeringandComputerScienc
4、eDOMAINNAMESYSTEM(DNS)•TheDNSistheworld’smostdistributeddatabase•Implementsthemappingofname↔networkaddressFindanIPaddressgivenanameFindanamegivenanIPaddressAlsousedformanyothernetworkresources•PreviousimplementationusedadatabasedistributedbytheInterNicserve
5、r:Flattextfile,HOSTS.TXT,distributedtoallInternethostsandroutersConsumedmuchoftheserver’sbandwidthcC.D.Cantrell(11/2004);DoDInternetHostTable6-Jun-88;Versionnumber747;;;Changes,corrections,commentsorquestionsto(HOSTMASTER@SRI-NIC.ARPA);;Theformatofthisfileis
6、documentedinRFC952,"DoDInternet;HostTableSpecification",whichisavailableonlineatSRI-NIC;asthefile[SRI-NIC]RFC952.TXT;;;ItmayberetrievedviaFTPusingusernameANONYMOUSwith;anypassword.;;Theformatforentriesis:;;NET:NET-ADDR:NETNAME:;GATEWAY:ADDR,ADDR:NAME:CPUT
7、YPE:OPSYS:PROTOCOLS:;HOST:ADDR,ALTERNATE-ADDR(ifany):HOSTNAME,NICKNAME:CPUTYPE:OPSYS:PROTOCOLS:;;;Where:ADDR=internetaddressindecimal,e.g.,26.0.0.73;;CPUTYPE=machinetype(PDP-11/70,VAX-11/780,FOONLY-F3,C/30,etc.);;OPSYS=operatingsystem(UNIX,TOPS20,TENEX,ITS,etc
8、.);;PROTOCOLS=transport/service(TCP/TELNET,TCP/FTP,etc.);;:(colon)=fielddelimiter;;::(2colons)=nullfield;;NET:3.0.0.0:GE-INTERNET:NET:4.0.0.0:SATNET:NET:6.0.0.0:YPG-NET:NET:7.0.0.0
