In Layer 2 topologies， spanning-tree failures can cause loops in the network. These unblocked loops cancause network failures because of excessive traffic. Which two Catalyst 6500 features can be used to limitexcessive traffic during spanning-tree loop conditions？（）

单项选择题InordertoconfiguretworoutersasanycastRPs，whichoftheserequirements，afaminimum，mustbesatisfied？（）

A.Multicast Source Discovery Protocol mesh-groups must be configured between the two anycast RPs.
B.The RPs must be within the same IGP domain.
C.Multicast Source Discovery Protocol must be configured between the two anycast RPs.
D.The two anycast RPs must be IBGP peers.

单项选择题InPIM-SMwhatcontrolplanesignalingmustamulticastsourceperformbeforeitbeginstosendmulticasttraffictoagroup？（）

A.The source must send a PIM Register message to the rendezvous point （RP）.
B.The source must first join the multicast group using IGMP before sending.
C.The source must perform a Request to Send （RTS） and Clear to Send （CTS） handshake with the  PIM designated router （DR）.
D.No control plane signaling needs to be performed； the source can simply begin sending on the local  subnet.

多项选择题Whichofthesestatementsaboutpenultimatehoppoppingaretrue？（）

A.It is used only for directly connected subnets or aggregate routes
B.It can only be used with LDP.
C.It is only used when two or more labels are stacked.
D.It enables the Edge LSR to request a label pop operation from Its upstream neighbors
E.It is requested through TDP using a special label value that is also called the implicit-null value.
F.It is requested through LDP using a special label value that is also called the implicit-null value.

单项选择题WhichtypesofprefixeswillarouterrunningBGPmostlikelyadvertisetoanIBGPpeer，assumingitisnotconfiguredasaroutereflector？（）

A.prefixes received from any other BGP peer and prefixes locally originated via network statements or redistributed
B.all prefixes in its routing table
C.prefixes received from EBGP peers and prefixes locally originated via network statements or     redistributed
D.prefixes received from EBGP peers and prefixes received from route reflectors
E.prefixes received from other IBGP peers， prefixes received from EBGP peers，and prefixes redistributedto BGP
F.prefixes received from other IBGP peers and prefixes received from route reflectors

单项选择题AllofthesearefundamentalbuildingblocksofdifferentiatedservicesTrafficConditionerBlockexceptwhichone？（）

A.dropper
B.classifier
C.marker
D.querier
E.meter
F.shaper