问答题
Whichtwostatementsaboutspanningtreepathcostaretrue?()
A.Thepathcostcanbechangedforaninterfaceusingthespanning-treecostcommand
B.Thepathcostcanbechangedforaninterfaceusingthestppath-costcommand
C.TheSPTdefaultpathcostdependsontheinterfacespeed
D.TheSTPdefaultpathcostissimilarforallinterface