单项选择题
panyusesMSTPwithintheirswitchedLAN.WhatisthemainpurposeofMultipleInstanceSpanningTreeProtocol(MSTP)?()
A.ToenhanceSpanningTreetroubleshootingonmultilayerswitches
B.Toreducethetotalnumberofspanningtreeinstancesnecessaryforaparticulartopology
C.Toprovidefasterconvergencewhentopologychangesoccurinaswitchednetwork
D.ToprovideprotectionforSTPwhenalinkisunidirectionalandBPDUsarebeingsentbutnotreceived
E.Noneoftheotheralternativesapply