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1、Networkscanbeinterconnectedbydifferentdevices•Inthephysicallayer,networkscanbeconnectedby1orhubs,whichjustmovethebitsfromonenetworktoanidenticalnetwork.Onelayerupwefindbridgesandswitches,whichoperateatdatalinklayer.Theycanaccept2zexaminetheMACaddress,andforwardtheframestoadiffere
2、ntnetworkwhiledoingminorprotocoltranslationintheprocess.Inthenetworklayer,wehaveroutersthatcanconnecttwonetworks.Iftwonetworkshave3networklayer,theroutermaybeabletotranslatebetweenthepacketformats.Inthetransportlayerwefindtransportgateway,whichcaninterfacebetweentwotransportconne
3、ctions.Finally,intheapplicationlayer,applicationgatewaystranslatemessage4>Asanexample,gatewaysbetweenInternete-mailandX.400e-mailmust5thee-mailmessageandchangevariousheaderfields•A.reapersB.relaysC•connectorsD•modems2^A.framesB.packetsC•packagesD.cells3、A.specialB•dependentC.simi
4、larD•dissimilar4、A.syntaxB•semanticsC•languageD.format5、A.analyzeB.parseC•deleteD•createDOMisaplatform-andlanguage-6APIthatallowsprogramsandscriptstodynamicallyaccessandupdatethecontent,structureandstyleofWWWdocuments(currently,definitionsforHTMLandXMLdocumentsarepartofthespecifi
5、cation)•Thedocumentcanbefurtherprocessedandtheresultsofthatprocessingcanbeincorporatedbackintothepresented7.DOMisa8-basedAPItodocuments,whichrequiresthewholedocumenttoberepresentedin9whileprocessing,it•AsimpleralternativetoDOMistheevent-basedSAX,whichcanbeusedtoprocessverylarge10
6、documentsthatdonotfitinfothememoryavailableforprocessing•6、A.specificB•neutralC•containedD.related7、A.textB•imageC•pageD.graphic8、A.tableB•treeC.controlD•event9、A.documentB•processorC.discD•memory10、A..XMLB・HTMLC.scriptD.webMIMDsystemscanbeclassifiedinto11-orientedsystems,high-av
7、ailabilitysystemsandresponse-orientedsystems.Thegoalof11-orientedmultiprocessingistoobtainhigh1114minimalcomputingcost.Thetechniquesemployedbymultiprocessoroperatingsystemstoachievethisgoaltakeadvantageofaninherentprocessingversusinput/outputbalanceintheworkloadtoproduce15and16•l
8、oadingofsystem1711>A.thoughB•throughC•th
