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A.Layer3routingbetweentheAccessandAggregationlayersfacilitiestheabilitytospanVLANsacrossmultipleaccessswitches,whichisarequirementformanyservervirtualizationandclusteringtechnologies.
B.“East-west”server-to-servertrafficcantravelbetweenaggregationmodulesbywayofthecore,butbackupandreplicationtraffictypicallyremainswithinanaggregationmodule.
C.Loadbalancing,firewallservice,andothernetworkservicearecommonlyintegratedbytheuseofservicemodulesthatareinsertedintheaggregationswitched.
D.VirtualizationtoolsallowacosteffectiveapproachforredundancyinthenetworkdesignbyusingtwoorfourVDCsfromthesamephysicalswitch.
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