InthecontextofMPLS,whatisthecorrectactiontobeperformedwhenanaggregatelabelisreceived?()

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A.ItaddstheVPNlabelintothetoplabelintheMPLSlabelstack

B.ItreplacesthetoplabelintheMPLSlabelstackwithaVPNlabelandpropagates

C.ItreplacesthebottomlabelintheMPLSlabelstackwithaVPNlabelandpropagates

D.ItremovesthetoplabelintheMPLSlabelstackanddoesaLayer3lookuponunderlyingIPpackets

E.Noneofabove

参考答案:

参考D

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