单项选择题 WhatpreventsroutingloopswhenMSDPisconfiguredacrossmultipledomains？（）

单项选择题 InJUNOSsoftware，whatisrequiredtoredistributeRIProutesintoOSPF？（）

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

单项选择题 WhichJUNOSsoftwareoperational－modecommanddisplaysthestatusofaDraft－MartiniVPN？（）

单项选择题 AnIS－ISrouterisadjacenttoandpassingtrafficwithaneighbor.Youperformashowis interfacedetailcommandandnoticethatforsomeinterfacesyouhaveacircuittypeof3.WhichIS－ISlevel（s）isenabledontheseinterfaces？（）