单项选择题

herequirementforhighavailabilitywithintheDataCenternetworkmaycausethedesignertoconsiderwhichoneofthefollowingsolutions?()

A.ConstructahierarchicalnetworkdesignusingEtherChannelbetweenaserverandtwoVDCsfromthesamephysicalswitch
B.UtilizeCiscoNSFwithSSOtoprovideintrachassisSSOatLayers2to4
C.DefinetheDataCenterasanOSPFNSSAarea,advertisingadefaultrouteintotheDCAndsummarizingtheroutesoutoftheNSSAtotheCampusCore
D.ImplementnetworkservicesfortheDataCenterasaseparateserviceslayerusingactive/activemodelthatismorepredictableinfailureconditions
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