单项选择题

How is RPF used in multicast routing？（）

A.to prevent multicast packets from looping
B.to prevent PIM packets from looping
C.to instruct PIM where to send a （*， G） or （S， G） join message
D.to prevent multicast packets from looping and to instruct PIM where to send a （*， G） or （S， G） joinmessage

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多项选择题

Which two multicast address ranges are assigned as source-specific multicast destination addresses andare reserved for use by source-specific applications and protocols？（）

A.232.0.0.0/8
B.239.0.0.0/8
C.232.0.0.0/4
D.FF3x：：/32
E.FF2x：：/32
F.FF3x：：/16

单项选择题

Refer to the exhibit. Look at the command output. What would be the most probable reason for this port-ID mismatch？（）

A. spanning-tree misconfiguration
B. speed mismatch configuration
C. cabling problem
D. configuration problem

单项选择题

Which type of domains is interconnected using Multicast Source Discovery Protocol？（）

A.PIM-SM
B.PIM-DM
C.PIM-SSM
D.DVMRP