电子商务作业02-.doc

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1、Chapter2:TechnologyInfrastructure:TheInternetandtheWorldWideWebTRUE/FALSENetworksofcomputersandtheInternetthatconnectsthemtoeachotherformthebasictechnologicalstructurethatunderliesvirtuallyallelectroniccommerce・TheUSENETwastheearliestofthenetworksthateventuallycombinedtobecomewhatwenowcallthe

2、Internet・E-mailwasbornin1972whenaresearcherwroteaprogramthatcouldsendandreceivemessagesovertheDefenseDepartmentnetwork.Anetworkofcomputersthatarelocatedclosetogether—forexample,inthesamebuilding一iscalledalocalareanetwork・TheInternetprovidesahighdegreeofsecurityinitsbasicstructure・Althoughfax,

3、telephone,e-mail,andovernightexpresscarriershavebeenthemaincommunicationstoolsforbusinessformanyyears,extranetscanreplacemanyofthematalowercost・Anintranetextendsbeyondtheorganizationthatcreatedit.TheUvirtuar"partofVPNmeansthattheconnectionseemstobeatemporary,internalnetworkconnection,buttheco

4、nnectionisactuallypermanent.VPNsoftwaremustbeinstalledonthecomputersatbothendsofthetransmission.Thetechnologiesused(publicnetworks,privatenetworks,orVPNs)areindependentoforganizationalboundaries.IPaddressesappearasfivenumbersseparatedbyperiods.SMTPisacommonprotocolusedforsendingandretrievinge

5、-mail.IMAPisanewere-mailprotocolthatperformsthesamebasicfunctionsasPOP,butincludesadditionalfeatures.ThePOPprotocolprovidessupportforMIME.15・Atatechnologicallevel,theWebisnothingmorethansoftwarethatrunsoncomputersthatareconnectedtotheInternet・16.ThesetofrulesfordeliveringWebpagefilesovertheIn

6、ternetisinaprotocolcalledtheHypertextTransferProtocol(HTTP).17.DomainnamesaresetsofwordsthatareassignedtospecificIPaddresses.18.Thehigherthebandwidth,thefasterdatafilestravelandthefasterWebpagesappearonyourscreen.19・Asymmetriccormectionsprovidethesamebandwidthforeachdirection.MULTIPLECHOICE1.

7、Thecombinationoftelephonelinesandtheclosedswitchesthatconnectthemtoeachotheriscalledaa.LANc.circuitb・WANd.pathway2.Onapacket-switchednetwork,filesande-mailmessagesarebrokendownintosmallpieces,calleda.messagesc.circuitsb.piecesd.packets3.Whenp