多项选择题
Which of these statements about penultimate hop popping are true？（）
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.
相关考题
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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 -
单项选择题
Youarethenetworkadministratorofanenterprisewithamainsiteandmultipleremotesites.YournetworkcarriesbothVOIPanddatatraffic.YouagreewithyourserviceprovidertoclassifyVOIPanddatatrafficaccordingtothedifferentserviceRFCs.HowcanyourdataandVOIPtrafficbemarked？（）
A.data marked with DSCP AF21，VOIP marked with DSCP EF
B.data marked with DSCP AF51，VOIP marked with DSCP EF
C.data marked with the DE-bit. VOIP marked with the CLP-bit
D.data marked with DSCP EF，VOIP marked with DSCP AF31
E.data marked with IP precedence 5，VOIP marked with DSCP EF
