多项选择题
A.On-Passive
B.On-Auto
C.Passive-Active
D.Desirable-Auto
E.Active-Active
F.Desirable-Desirable
单项选择题 WhichinformationiscarriedinanOSPFv3intra-area-prefixLSA？（）
单项选择题 WhichofthesestatementsbestdescribesthemajordifferencebetweenanIPv4-compatibletunnelanda6to4tunnel？（）
单项选择题 YouareusingVTPversion2inyournetworktotransportVLANinformationbetweenswitches.When addingaswitchtothenetworkthathasbeenusedinthelabpreviously，younoticethatalotoftheexistingVLANshavebeendeletedorreplacedwithothernames.Whatcanyoudotopreventthisfromhappeninginthefuture，withoutlosingallVTPfeaturesthatyouareusingtoday？（）