未知题型

A.OSPFovermulticastEMSorVPLSnetworkmaynothaveconsistentbroadcastormulticastperformance
B.IPmulticastisnotsupportedoverLover3MPLSVPN;insteadaLayer2MPLSWNmustbeutilizedwithserviceprovidersupport
C.QoSrequirementswithMPLS-VPNmustbeimplementedbytheserviceprovider
D.HierarchicalVPLSdesignsaretheleastscalable
E.IGMPsnoopingisnotonoptionwithVPLSorEMS;insteadadministrativescopingorallowingsufficientbandwidthforunnecessarymulticasttrafficattheedgelinksisrequired
【参考答案】

A, C

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