单项选择题
What is the use of MSDP across multiple PIM domains？（）
A.It scopes multicast traffic. B.It prevents multicast routing loops. C.It advertises active multicast sources. D.It advertises RPs to all downstream routers.
单项选择题 HowisatiebrokeninAuto-RP？（）
单项选择题 WhichmethodofdynamicRPelectionisnon-proprietary？（）
单项选择题 InJUNOSsoftware，whichtypeofencapsulationisrequiredonaPErouterfortheCE-facinginterfaceinaMartini-basedVPN？（）
