单项选择题

panyusesMSTPwithintheirswitchedLAN.WhatisthemainpurposeofMultipleInstanceSpanningTreeProtocol(MSTP)?()

A.ToenhanceSpanningTreetroubleshootingonmultilayerswitches
B.Toreducethetotalnumberofspanningtreeinstancesnecessaryforaparticulartopology
C.Toprovidefasterconvergencewhentopologychangesoccurinaswitchednetwork
D.ToprovideprotectionforSTPwhenalinkisunidirectionalandBPDUsarebeingsentbutnotreceived
E.Noneoftheotheralternativesapply