单项选择题
A. DPT
B. MPLS
C. VPLS
D. CWDM
E. DWDM
F. SONET/SDH
多项选择题 WhichtwostatementsarecorrectregardingFlexLinks？（）
多项选择题 OSPFstubareasareanimportanttoolfortheNetworkdesigner；whichofthefollowingtwoshouldbeconsideredwhenutilizingOSPFstubareas？（）
多项选择题 AsacriticalpartofthedesignfortheEnterpriseCampusnetwork，whichofthefollowingtwoaretrueconcerningintrusiondetectionandpreventionsolution？（）