2023年全國碩士研究生考試考研英語一試題真題(含答案詳解+作文范文)_第1頁
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1、英文原文WhatisIPv6IPv6isshtf“InterProtocolVersion6“.IPv6isthe“nextgeneration“protocoldesignedbytheIETFtoreplacethecurrentversionInterProtocolIPVersion4(“IPv4“).MostoftodaysInterusesIPv4whichisnownearlytwentyyearsold.IPv4hasb

2、eenremarkablyresilientinspiteofitsagebutitisbeginningtohaveproblems.MostimptantlythereisagrowingshtageofIPv4addresseswhichareneededbyallnewmachinesaddedtotheInter.IPv6fixesanumberofproblemsinIPv4suchasthelimitednumberofa

3、vailableIPv4addresses.ItalsoaddsmanyimprovementstoIPv4inareassuchasroutingwkautoconfiguration.IPv6isexpectedtograduallyreplaceIPv4withthetwocoexistingfanumberofyearsduringatransitionperiod.Someintroductyinfmationaboutthe

4、protocolcanbefoundinourIPv6FAQ.FthoseinterestedinthetechnicaldetailswehavealistofIPv6relatedspecifications.InterProtocolVersion6isabbreviatedtoIPv6(wherethe“6“referstoitbeingassignedversionnumber6).Thepreviousversionofth

5、eInterProtocolisversion4(referredtoasIPv4).IPv6isanewversionofIPwhichisdesignedtobeanevolutionarystepfromIPv4.ItisanaturalincrementtoIPv4.ItcanbeinstalledasanmalsoftwareupgradeinInterdevicesisinteroperablewiththecurrentI

6、Pv4.Itsdeploymentstrategyisdesignedtonothaveanyflagdaysotherdependencies.IPv6isdesignedtorunwellonhighperfmancewks(e.g.GigabitEtherOC12ATMetc.)atthesametimestillbeefficientflowbwidthwks(e.g.wireless).Inadditionitprovides

7、aplatfmfnewInterfunctionalitythatwillberequiredinthenearfuture.otherinfmationthatisusuallymanuallyconfigured.Thisschemealsomakesitmucheasiertorenumberthemachinesfexampleifthesitechangesserviceprovider.Inthecaseofmultihom

8、edsitestherewillbemultipleaddressespersystem.TosomethemostimptantfeatureisrestingtheendtoendnatureoftheInter.ThisidealhasbeenerodedbyprivatewksbehindwkAddressTranslat(NAT)boxes.ImprovedSecurityispossiblewithendtoendconne

9、ctionsinfactsomeversionsofIPsecurity(IPsec)whichisbuiltintotheIPv6specificationrequireit.SomegamestoocannotoperatethroughaNAT.IPv6DeploymentMostofthelargeplayersintheInterwldhavereleasedIPv6versionsoftheirproducts.Manyro

10、utervendsincludingCiscohaveIPv6enabledproducts.SunMicrosofthaveIPv6awareoperatingsystemsTCPIPstacks.IPv6isalsoavailablefLinuxFreeBSDmostotheroperatingsystems.ManywksaredeployingIPv6.Alsositesareusingtunnelingtechniquesto

11、transptIPv6overtheirexistingIPv4wk.ThisallowssitesunabletoinstallnativeIPv6connectionstoparticipateearlyintheefftgainusefuloperationalexperience.Thethirdgeneration(3G)mobilephonedevelopershavealsosettledonusingIPv6、thece

12、oftheirsystem.Itisclearthefutureofmobilecommunicationisnotlimitedtovoicetheabilitytotransferdatawhetherthatisawebpagevideoconferencingwillgreatlyenhancetheirproduct.The6Bohe6boneisanIPv6Testbed.Itiscurrentlyawldwideinfma

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