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In the following essay, each blank has four choices. Choose the most suitable one from the four c...
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中级网络工程师《单项选择》真题及答案
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1Inthestrengthofthecarriersignalisvariedtorepresentbinary1or0. 2isasystemthatcanmapanametoanaddressandconverselyanaddresstoanname. 3isathree-wayhandshakingauthenticationprotocolthatit’spacketsareencapsulatedinthepoint-to-pointprotocol 4isanapproachthatenablesanATMSwitchtobehavelikeaLANswitch. 5isanguidedmediawhichismadeofglassorplasticandtransmitssignalsintheformoflight. 3
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Thepurposeoftherequirementsdefinitionphaseistoproduceaclearcompleteconsistentandtestable1ofthetechnicalrequirementsforthesoftwareproduct. Duringtherequirementsdefinitionphasetherequirementsdefinitionteamusesaniterativeprocesstoexpandabroadstatementofthesystemrequirementsintoacompleteanddetailedspecificationofeachfunctionthatthesoftwaremustperformandeach2thatitmustmeet.Thestartingpointisusuallyasetofhigh-levelrequirementsfromthe3thatdescribetheprojectorproblem. Ineithercasetherequirementsdefinitionteamformulatesanoverallconceptforthesystemandthedefines4showinghowthesystemwillbeoperatedpublishesthesystemandoperationconceptdocumentsandconductsasystemconceptreviewSCR. FollowingtheSCRtheteamderives5requirementsforthesystemfromthehighlevelrequirementsandthesystemoperationsconcept.Usingstructuredorobject-orientedanalysistheteamspecifiesthesoftwarefunctionsandalgorithmsneededtosatisfyeachdetailedrequirements. 1
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码是一些码字组成的集合一对码字之间的海明距离是1一个码的海明距离是所有不同码字的海明距离的2如果要检查出d位错那么码的海明距离是3如果信息长度为5位要求纠正1位错按照海明编码需要增加的校验位是4以太网中使用的校验码标准是5 2
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Inthefollowingessayeachblankhasfourchoices.Choosethebestanswerandwritedownontheanswersheet. Microwavecommunicationuses1-frequencyradiowavesthattravelinstraightlinesthroughtheair.Becausethewavescannot2withthecurvatureoftheearththeycanbe3onlyovershortdistance.Thusmicrowaveisagood4forsendingdatabetweenbuildingsinacityoronalargecollegecampus.Forlongerdistancesthewavesmustberelayedbymeansof"dishes"or5.Thesecanbeinstalledontowershighbuildingsandmountaintops. 4
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