问题:
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.
● 参考解析
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