小学、初中、高中各种试卷真题知识归纳文案合同PPT等免费下载www.doc985.com小学、初中、高中各种试卷真题知识归纳文案合同PPT等免费下载www.doc985.com选择性必修第二册Unit4BreakingboundariesⅠ.阅读理解ANetwork-basedtechnologieshavebecomeincreasinglywidespread，andtheyarenowbeingusedbycountlessindividuals，professionals，andbusinessesworldwide.Despitetheiradvantages，mostnetwork-basedsystemsarehighlyatriskofmalicious(恶意的)attacks.Theconsequencesofamaliciousattackonnetwork-basedsystemscanbeextremelyharmful.Forinstance，anattackonapowerplantnetworkcouldleavemillionsofindividualsandofficeswithoutelectricity，whileattacksonsocialmedianetworkscanleadtoexposureofuserinformation.Toovercometheweaknessesofnetwork-basedsystems，computerscientistsworldwidehavebeentryingtodevelopadvancedintrusiondetectionsystems(IDSs)(入侵检测系统)thatcouldhelptoidentifymaliciousattacks，increasinganetwork’ssafety.Inrecentyears，machinelearning(ML)algorithms(机器学习算法)havebeenfoundtobeparticularlypromisingforautomaticallydetectingattacksandintrusionsonanetwork’sfunctioning.AnimportantstepinthedevelopmentandtrainingofML-basedIDSsistheselectionofdatafeaturesthatamodelcanrelyorfocusonwhenmakingpredictions.Ideally，byanalyzinglargedatasets，researchersshouldbeabletoidentifythemostsuitablefeaturesforsolvingagiventaskusingMLtools，andthiscanalsobeappliedtointrusiondetection.ResearchersatCanadianUniversityDubaiintheUAEhaverecentlydevelopedanewfeatureselectionmethodthatcouldenablethedevelopmentofmoreeffectiveML-basedIDSs.Thismethodwasfoundtoperformremarkablywellwhencomparedwithothercommonlyemployedfeatureselectiontechniques.Usingthefeaturestheyidentifiedasmostimportantforintrusiondetection，theresearcherscreatedahighlyefficientML-baseddetectionsystem.ThissystemwasfoundtobecapableofdistinguishingbetweenDDoSattacksandharmlessnetworksignalswith99%accuracy.Inthefuture，thefeatureselectionmethoddevelopedbytheresearchersandtheirfindingscouldhelpthedevelopmentofnew，highlyeffectiveIDSs.Inaddition，thesystemtheycreatedusingthefeaturestheyidentifiedcouldbeappliedinreal-worldsettingstodetectmaliciousattacksonrealnetworks.1．Whatdoesparagraph1focusonaboutnetwork-basedtechnologies?A．Theirtargetedusers.B．Theirpopularity.C．Theirpotentialrisk.D．Theiradvantages.小学、初中、高中各种试卷真题知识归纳文案合同PPT等免费下载www.doc985.com小学、初中、高中各种试卷真题知识归纳文案合同PPT等免费下载www.doc985.com2．HowcanIDSsincreasethesafetyofnetworks?A．Bytrackingmaliciousattacks.B．Bystartinganti-virusprograms.C．Bysortingoutuserinformation.D．Byrecognizingmaliciousattacks.3．WhatisthekeytothedevelopmentofML-basedIDSs?A．Solvinggiventasks.B．Selectingreliabledatafeatures.C．Makingaccuratepredictions.D．Analyzinglargeenoughdatasets.4．What’sthepurposeofthetext?A．TointroduceanewtechniqueforIDSs.B．Topromotenetwork-basedtechnologies.C．Toraisepeople’sawarenessofnetworksafety.D．Todiscusswaystodealwithmaliciousattacks.BBeavers(海狸)，likehumans，changetheirsurroundingstofittheirneeds.Knownasnature’sengineers，theyteartreesdowntobuildhomestoliveinanddamstoraisewaterlevelsforprotectionfromenemies.Damsalsoslowwater’sflowwhileblockingsediment(沉积物)thatwouldotherwiseflowdownstream.Theresultingwetlandsoftenattractwildlifediversitywherenonehadexisted.Therearechallenges，though.Beaverdamssometimescauseflooding，andmostpeopleprefertree...