单项选择题 AnOSPFnon-backboneareafollowsexternalroutestobefloodedwithinthearea.Theseexternalroutesarepropagatedintootherareas.However，externalroutesfromotherareasarenotallowedtoenterthisarea.WhichtypeofOSPFareadoesthisdescribe？（）A.stubareaB.transitareaC.borderareaD.not-so-stubbyarea

单项选择题 WhichroutingtablestoresIPv6routes？（）

单项选择题 Which of the followingLSAistheType10？（）

单项选择题 Whichstatementaccuratelydescribesfirewalluserauthentication？（）

单项选择题 Underwhichconfigurationhierarchyisanaccessprofileconfiguredforfirewalluserauthentication？（）