WhichuniquecharacteristicsoftheDataCenterAggregationlayermustbeconsideredbyan EnterpriseCampusdesigner?()

A.Layer3routingbetweentheAccessandAggregationlayersfacilitiestheabilitytospanVLANsacrossmultipleaccessswitches，whichisarequirementformanyservervirtualizationandclusteringtechnologies.

B.“East-west”server-to-servertrafficcantravelbetweenaggregationmodulesbywayofthecore，butbackupandreplicationtraffictypicallyremainswithinanaggregationmodule.

C.Loadbalancing，firewallservice，andothernetworkservicearecommonlyintegratedbytheuseofservicemodulesthatareinsertedintheaggregationswitched.

D.VirtualizationtoolsallowacosteffectiveapproachforredundancyinthenetworkdesignbyusingtwoorfourVDCsfromthesamephysicalswitch.