单项选择题
A. Switches 1, 2, 3, and 6 will part icipate in the multicast tree once pruning has taken place.
B. Switches 2 and 6 will participate in the multicast tree once pruning has taken place.
C. Switches 1, 2, 3, and 6 will participate in the multicast tree.
D. The multicast server is the rendez vous point of the multicast tree.
多项选择题 Which two statements about the IS -IS routing protocol are true?（）
单项选择题 Refer to the exhibit. OSPF has been configured on all routers in the network. However, router R1 does not receive a default route to router R2 as in tended. Which configuration change would ensure that R1 would receive a default route from R2? （）
多项选择题 Which two statements are true about IBGP neighbor relationships?（）
