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單項(xiàng)選擇題

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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