单项选择题
A.Router LSA
B.Opaque LSA
C.AS attributes LSA
D.ASBR summary LSA
E.Network summary LSA
单项选择题 AnOSPFnon-backboneareaallowsexternalroutestobefloodedwithinthearea.Theseexternalroutesarepropagatedintootherareas.However，externalroutesfromotherareasarenotallowedtoenterthisarea.WhichtypeofSPFareadoesthisdescribe？（）
多项选择题 WhichtwomechanismscontrolroutedistributionbetweenPEroutersina2547bisVPN？（）
单项选择题 WhichJUNOSsoftwareoperational-modecommanddisplaysthestatusofaDraft-MartiniVPN？（）