Which of these statements about PIM join messages in classic PIM-SM is correct?()

A . PIM join messages are sent every 60 seconds to refresh the upstream router’s mroute state for the multicast tree. B . Routers send a PIM join acknowledgement in response to each PIM join message received from a downstream router. C . PIM join messages are only sent when the multicast distribution tree is first being established. D . PIM join messages are sent every three minutes to refresh the upstream router’s mroute state for the multicast tree.

时间:2022-08-28 09:22:23 所属题库:CCIE系列认证综合练习题库

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