无色透明有弹性，不含神经血管的结构是A．B．C．D．E．

A.Filteringisonlyusefulwhencombinedwithroutesummarization

B.Itisbesttofilter（allow）thedefaultandsummaryprefixesonlyintheEnterpriseEdgetoremotesitesorsite-to-siteIPsecVPNnetworks

C.IGPs（forexampleEIGRPorOSPF）aresuperiortoroutefilteringinavoidingininappropriatetransittrafficthroughremotenodesorinaccurateorinappropriateroutingupdates

D.Theprimarylimitationofrouterfilteringisthatitcanonlybeappliedonoutboundupdates

A.根据帧头的第一个IP地址建立路由表

B.使用帧的源MAC地址建立和维护MAC地址表

C.将目的IP地址未知的帧转发到默认网关

D.利用MAC地址表根据帧的目的MAC地址来转发帧

E.检查帧的目的MAC地址，将新的MAC地址添加到MAC地址表中

A.UsingmultipleEIGRPprocesses

B.TuningdowntheEIGRPdelayparameter

C.FIGRPstubrouting

D.LimitingthenumberofEIGRPneighborperdevice

A.ItisrecommendedtoplacetheVPNterminationdeviceinlinewiththeEnterpriseEdge1

B.Maintainingaccessrules，basedonthesourceIPoftheclient，onaninternalfirewalldrawnfromaheadendRADIUSserveristhemostsecuredeployment

C.VPNHeadendroutingusingReverseRouteInjection（RRI）withdistributionisrecommended whentheremoteusercommunityissmallanddedicatedDHCPscopesareinplace

D.ClientlessSSLVPNsprovidemoregranularaccesscontrolthanSSLVPNclients（thinorthick），includingatLayer7

A.PortFast

B.UplinkFast

C.loopguard

D.rootguard

E.BPDUguard

F.BackboneFast

A.ConstructahierarchicalnetworkdesignusingEtherChannelbetweenaserverandtwoVDCsfromthesamephysicalswitch

B.UtilizeCiscoNSFwithSSOtoprovideintrachassisSSOatLayers2to4

C.DefinetheDataCenterasanOSPFNSSAarea，advertisingadefaultrouteintotheDCAndsummarizingtheroutesoutoftheNSSAtotheCampusCore

D.ImplementnetworkservicesfortheDataCenterasaseparateserviceslayerusingactive/activemodelthatismorepredictableinfailureconditions

A.toacoreswitchrunningCiscoNSFandSSOfromredundantdistributionswitchesconnected withaLayer2link

B.toacoreswitchrunningCiscoNSFandSSOfromredundantdistributionswitchesconnected withaLayer3link

C.totwocoreswitchesfromredundantdistributionswitchesconnectedwithLayer2link

D.totwocoreswitchesfromredundantdistributionswitchesconnectedwithLayer3link

E.totwocoreswitchesrunningCiscoNSFandSSOfromtworedundantdistributionswitches runningCiscoNSFandSSO

A.CSU/DSU

B.调制解调器

C.DSL路由器

D.NT1设备

E.ISDN调制解调器

A.Ifnocorelayerisdeployed，thedesignwillbeeasiertoscale

B.Adedicatedcampuscorelayershouldbedeployedforconnectingthreeormorebuildings

C.Ifnocorelayerisdeployed，thedistributionswitchesshouldnotbefullymeshed

D.Adedicatedcampuscorelayerisnotneededforconnectingfewerthanfivebuildings

A.GRE

B.8021Q

C.MPLS

D.L2TPv3