单项选择题
Which tech nology manages multicast traffic at Layer 2 by configuring Layer 2 LAN interfaces dynamically to forward multicast traffic only to those interfaces that want to receive it?（）
A. IGMP B. IGMP snooping C. PIM - DM D. DVMRP E. MOS PF
单项选择题 Refer to the exhibit. Which command would verify if PBR reacts to packets sourced from 172.16.0.0/16?（）
多项选择题 Which three statements about OSPF areas are true?（）
多项选择题 Refer to the exhibit. Which two Cisco IOS commands on R2 would verify its OSPF neighbor relationships?（）
