多项选择题

Which two of these multicast deployments are most susceptible to attacks from unknown sources？（）

A. ASM
B. BiDir PIM
C. PIM-SM RP
D. RP-Switchover
E. Source Specific Multicast

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单项选择题

What is the default value of the SPT threshold in Cisco routers？（）

A. 0
B. 1
C. 2
D. 4
E. 16
F. infinity

多项选择题

Refer to the exhibit. Which two statements are correct regarding the creation of a multicas tdistribution tree？（）

A. Each router determines where to send the JOIN request.
B. The tree will be built based on the IP address of the E2 interface on router E
C. The best path to the source will be discovered in the unicast routing table on router B
D. The best path to the source will be discovered in the unicast routing table on router C
E. The best path to the source will be discovered in the unicast routing table on router E

单项选择题

To which of these does IP multicast send packets？（）

A. a single host
B. a subset of hosts
C. all hosts sequentially
D. all hosts simultaneously