单项选择题
A.Level 1 internal routes
B.Level 1 external routes
C.Level 2 internal routes
D.Level 2 external routes
单项选择题 AnIS-ISrouterisadjacenttoandpassingtrafficwithaneighbor.Youperformashowis interfacedetailcommandandnoticethatforsomeinterfacesyouhaveacircuittypeof3.WhichIS-ISlevel（s）isenabledontheseinterfaces？（）
单项选择题 Whichof the following multicastmodedoesAuto-RPrequire？（）
多项选择题 WhichtwoaredefaultpreferencevaluesforbothinternalandexternalIS-ISLevel2routesonaJuniperNetworksrouter？（）