题目内容

21. Why do RIP, OSPF, and BGP run over UDP, IP,and TCP, respectively?

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22. Can you estimate the number o routing table entriesin intra-AS and inter-AS routers? (Estimate the rangeor order o magnitude.)

23. How do routing protocols in zebra exchangemessages with other routers and update routingtables in the kernel?

24. How does a router know through IGMP whetherhosts in its subnet have joined a multicast group?

25. Does a router know exactly which hosts have joineda multicast group?