单项选择题

Cat6500（config）routerospf1Cat6500（config-router）network0.0.0.0255.255.255.255area0Cat6500（config-router）nsfCat6500（config-router）endRefertotheexhibit.TheconfigurationisusedtoenablenonstopforwardingforOSPFonaCatalyst6500SeriesSwitchwithredundantsupervisorengines.ThedefaultCEFconfigurationisunchanged.Aftertesting，usertrafficisinterruptedandNSFisnotoperational.Whatisthemostlikelyreason？（）
A.CEFwasnotproperlyconfigured.
B.OSPFwasnotproperlyconfiguredforgracefulrestart.
C.Statefulswitchoverwasnotcorrectlyconfigured.
D.NSFforOSPFisonlysupportedinarea0.

A.0.0.0255.255.255.255area0Cat6500（config-router）nsfCat6500（config-router）endRefertotheexhibit.TheconfigurationisusedtoenablenonstopforwardingforOSPFonaCatalyst6500SeriesSwitchwithredundantsupervisorengines.ThedefaultCEFconfigurationisunchanged.Aftertesting，usertrafficisinterruptedandNSFisnotoperational.Whatisthemostlikelyreason？（）
A.CEFwasnotproperlyconfigured.
B.OSPFwasnotproperlyconfiguredforgracefulrestart.
C.Statefulswitchoverwasnotcorrectlyconfigured.
D.NSFforOSPFisonlysupportedinarea0.

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Youaretaskedwithdesigningasecuritysolutionforyournetwork.Whatinformationshouldbegatheredpriortodesigningthesolution？（）

A.IPaddressingdesignplanssothatthenetworkcanbeappropriatelysegmentedtomitigatepotentialnetworkthreats
B.detailedsecuritydevicespecifications
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WhenyouenableportsecurityonaninterfacethatisalsoconfiguredwithavoiceVLAN，whatisthemaximumnumberofsecureMACaddressesthatshouldbesetontheport？（）

A.NomorethanonesecureMACaddressshouldbeset.
B.Thedefaultwillbeset.
C.TheIPphoneshoulduseadedicatedport，thereforeonlyoneMACaddressisneededperport.
D.Novalueisneedediftheswitchportpriorityextendcommandisconfigured.
E.NomorethantwosecureMACaddressesshouldbeset.