What is the Cisco IOS default behavior for switching from the shared tree to the shortest path tree in PIM-SM operations？（）
- A、immediately after receiving the first packet on the shared tree for a given （S，G）
- B、after receiving over 1 kb/s traffic onthe shared tree for a given （S，G）
- C、10 seconds after receiving the first packet on the shared tree for a given （S，G）
- D、30 seconds after receiving the first packet on the shared tree for a given （S，G）
- E、after receiving over 10 kb/s traffic onthe shared tree for a given （S，G）
正确答案:A
答案解析:有
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