In a three-tier hierarchical campus network design, which action is a design best-practice for the core layer?
A、provideQoSprioritizationservicessuchasmarking,queueing,andclassificationforcriticalnetworktraffic
B、provideredundantLayer3point-to-pointlinksbetweenthecoredevicesformorepredictableandfasterconvergence
C、provideadvancednetworksecurityfeaturessuchas802.1X,DHCPsnooping,VACLs,andportsecurity
D、provideredundantaggregationforaccesslayerdevicesandfirst-hopredundancyprotocolssuchasVRRP