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1、常见Internet术语表ADN(AdvancedDigitalNetwork)--Usuallyreferstoa56Kbpsleased-line.AppletAsmallJavaprogramthatcanbeembeddedinanHTMLpage.Appletsdifferfromfull-fledgedJavaapplicationsinthattheyarenotallowedtoaccesscertainresourcesonthelocalcomputer,suchasfilesandse
2、rialdevices(modems,printers,etc.),andareprohibitedfromcommunicatingwithmostothercomputersacrossanetwork.ThecurrentruleisthatanappletcanonlymakeanInternetconnectiontothecomputerfromwhichtheappletwassent.ArchieAtool(software)forfindingfilesstoredonanonymousF
3、TPsites.Youneedtoknowtheexactfilenameorasubstringofit.ARPANet(AdvancedResearchProjectsAgencyNetwork)--TheprecursortotheInternet.Developedinthelate60’sandearly70’sbytheUSDepartmentofDefenseasanexperimentinwide-area-networkingthatwouldsurviveanuclearwar.ASCI
4、I(AmericanStandardCodeforInformationInterchange)--Thisisthedefactoworld-widestandardforthecodenumbersusedbycomputerstorepresentalltheupperandlower-caseLatinletters,numbers,punctuation,etc.Thereare128standardASCIIcodeseachofwhichcanberepresentedbya7digitbin
5、arynumber:0000000through1111111.BackboneAhigh-speedlineorseriesofconnectionsthatformsamajorpathwaywithinanetwork.Thetermisrelativeasabackboneinasmallnetworkwilllikelybemuchsmallerthanmanynon-backbonelinesinalargenetwork.BandwidthHowmuchstuffyoucansendthrou
6、ghaconnection.Usuallymeasuredinbits-per-second.AfullpageofEnglishtextisabout16,000bits.Afastmodemcanmoveabout15,000bitsinonesecond.Full-motionfull-screenvideowouldrequireroughly10,000,000bits-per-second,dependingoncompression.BaudIncommonusagethebaudrateof
7、amodemishowmanybitsitcansendorreceivepersecond.Technically,baudisthenumberoftimespersecondthatthecarriersignalshiftsvalue-forexamplea1200bit-per-secondmodemactuallyrunsat300baud,butitmoves4bitsperbaud(4x300=1200bitspersecond).BBS(BulletinBoardSystem)--Acom
8、puterizedmeetingandannouncementsystemthatallowspeopletocarryondiscussions,uploadanddownloadfiles,andmakeannouncementswithoutthepeoplebeingconnectedtothecomputeratthesametime.Therearemanythousands(millions?)of
