A.如果使用不当,高效农药的应用也会带来世界性公害
B.滴滴涕已经被证明是一种对人类有害无益的农药
C.滥施高效农药对害虫的天敌也会造成毁灭性灾难
D.某些科学成果是把“双刃剑”,对其利用需持谨慎态度
第2题
第3题
第4题
A.BeforeMPLSisenabled,theipcefcommandisonlyrequitedonrouters1and4
B.AfterMPLSisenabled,theipcefcommandisonlyrequiredonrouters1and4
C.BeforeMPLSisenabled,theipcefcommandisonlyrequiredontheEthernet0interfacesofrouters1and4
D.AfterMPLSisenabled,theipcefcommandisonlyrequiredontheEthernet0interfacesofrouters1and4
E.BeforeMPLSisenabled,theipcefcommandmustbeappliedtoallproviderrouters
第5题
A.TopreventcustomersfromrunningTDPwiththeISProuters
B.TopreventcustomersfromrunningLDPwiththeISProuters
C.TopreventotherISPsfromrunningLDPwiththeISProuters
D.Topreventman-in-the-middleattacks
E.TouseCBACtoshutdownDistributedDenialofServiceattacks
F.TouseIPStoprotectagainstsession-replayattacks
G.Noneoftheabove
第6题
A.IKEkeepalivesareunidirectionalandsenteverytenseconds
B.IPsecusestheEncapsulatingSecurityProtocol(ESP)ortheAuthenticationHeader(AH)protocolforexchangingkeys
C.ToestablishIKESA,mainmodeutilizessixpacketswhileaggressivemodeutilizesonlythreepackets
D.IKEusestheDiffie-HellmanalgorithmtogeneratesymmetricalkeystobeusedbyIPsecpeers
第7题
A.HSRP
B.DualRouterMode(DRM)IPsec
C.IPsecBackupPeerings
D.RRI
第8题
A.A
B.B
C.C
D.D
第9题
A.ThecyptoisakmpkeepalivecommandisusedtoconfiguretheStatefulSwitchover(SSO)protocol
B.ReverseRouteInjection(RRI)isconfiguredonattheremotesitetoinjectthecentralsitenetworks
C.EachHotStandbyRoutingProtocol(HSRP)standbygrouphastwowell-knownMACaddressesandavirtualIPaddress
D.Thecyptoisakmpkeepalivecommandisusedtoconfigurestatelessfailover
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