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1、常见Internet术语表ADN(AdvancedDigitalNetwork)--Usuallyreferstoa56Kbpsleased-line.AppletAsmallJavaprogramthatcanbeembeddedinanHTMLpage.Appletsdifferfromfull-fledgedJavaapplicationsinthattheyarenotallowedtoaccesscertainresourcesonthelocalcomputer,suchasfilesandserialdevices(modems,
2、printers,etc.),andareprohibitedfromcommunicatingwithmostothercomputersacrossanetwork.ThecurrentruleisthatanappletcanonlymakeanInternetconnectiontothecomputerfromwhichtheappletwassent.ArchieAtool(software)forfindingfilesstoredonanonymousFTPsites.Youneedtoknowtheexactfilenameo
3、rasubstringofit.ARPANet(AdvancedResearchProjectsAgencyNetwork)--TheprecursortotheInternet.Developedinthelate60’sandearly70’sbytheUSDepartmentofDefenseasanexperimentinwide-area-networkingthatwouldsurviveanuclearwar.ASCII(AmericanStandardCodeforInformationInterchange)--Thisist
4、hedefactoworld-widestandardforthecodenumbersusedbycomputerstorepresentalltheupperandlower-caseLatinletters,numbers,punctuation,etc.Thereare128standardASCIIcodeseachofwhichcanberepresentedbya7digitbinarynumber:0000000through1111111.BackboneAhigh-speedlineorseriesofconnections
5、thatformsamajorpathwaywithinanetwork.Thetermisrelativeasabackboneinasmallnetworkwilllikelybemuchsmallerthanmanynon-backbonelinesinalargenetwork.BandwidthHowmuchstuffyoucansendthroughaconnection.Usuallymeasuredinbits-per-second.AfullpageofEnglishtextisabout16,000bits.Afastmod
6、emcanmoveabout15,000bitsinonesecond.Full-motionfull-screenvideowouldrequireroughly10,000,000bits-per-second,dependingoncompression.BaudIncommonusagethebaudrateofamodemishowmanybitsitcansendorreceivepersecond.Technically,baudisthenumberoftimespersecondthatthecarriersignalshif
7、tsvalue-forexamplea1200bit-per-secondmodemactuallyrunsat300baud,butitmoves4bitsperbaud(4x300=1200bitspersecond).BBS(BulletinBoardSystem)--Acomputerizedmeetingandannouncementsystemthatallowspeopletocarryondiscussions,uploadanddownloadfiles,andmakeannouncementswithoutthepeople
8、beingconnectedtothecomputeratthesametime.Therearemanythousands(millions?)of
