Chapter10 - CHAPTER 10 IGMP Exercises 1 There is no need...

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1 CHAPTER 10 IGMP Exercises 1. There is no need for a report message to travel outside of its own network because its only purpose is to inform the next router in the spanning tree of group member- ship. There is no need for a query message to travel outside of the local network because its only purpose is to poll the local network for membership in any groups. 3. 00000001 00000000 01011110 00011000 00111100 00001001 5. The host must send as many as five different report messages at random times in order to preserve membership in five different groups. 7. See Figure 10.1. Figure 10.1 Exercise 7 5 4 1 1 2 0 28 0 0xEE9B 0 224.0.0.1 202.45.33.21 0 0x11 100 Checksum
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SECTION 2 9. See Figure 10.2. 11. See Figure 10.3. 13. If the router cannot find the groupid in its table, it drops the packet. 15. No action should be taken. 17. When the host receives the request from the process, it should create a new entry in its group table setting the state for the group to Delaying and its reference count to 1. It should also set a timer. When the timer expires, it should send a report mes- sage to the router. See Figure 10.4
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