InthecontextofMPLS,whatisthecorrectactiontobeperformedwhenanaggregatelabelisreceived?()
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A.ItaddstheVPNlabelintothetoplabelintheMPLSlabelstack
B.ItreplacesthetoplabelintheMPLSlabelstackwithaVPNlabelandpropagates
C.ItreplacesthebottomlabelintheMPLSlabelstackwithaVPNlabelandpropagates
D.ItremovesthetoplabelintheMPLSlabelstackanddoesaLayer3lookuponunderlyingIPpackets
E.Noneofabove
参考答案: