OSPFstubareasareanimportanttoolfortheNetworkdesigner；whichofthefollowingtwoshouldbeconsideredwhenutilizingOSPFstubareas？（）

A.OSPFstubareasincreasethesizeoftheLSDBwiththeadditionofType3and5LSAs
B.OSPFnotsostubbyareasareparticularlyusefulasasimplerformofsummarization
C.OSPFstubareasarealwaysinsulatedfromexternalchanges
D.OSPFtotallystubbycannotdistinguishamongABRsforthebestroutetodestinationsoutsidetheareas
E.OSPFstubareascandistinguishamongASBRsfordestinationsthatareexternaltotheOSPFdomain

【参考答案】

B, D