单项选择题
A.Create virtual links.
B.Advertise external prefixed.
C.Summarize routes between areas.
D.Advertise a router’s interfaces and metrics.
多项选择题 WhichthreeauthenticationoptionsdoesOSPFsupport？（）
单项选择题 RoutersAandBhaveanOC12candaGElinkbetweenthemandarerunningOSPFoverbothoftheselinks.Whichitemiscorrect，assumingthedefaultJUNOSsoftwareOSPFmetriccalculation？（）
多项选择题 YouwanttolimitthenumberofType7LSAstobeconvertedintoType5LSAsatanappropriateARB.Whichtwocommandsshouldyouusefromthe[edit]hierarchylevelwithintheJUNOSsoftwareconfigurationmode？（）