Review Questions
| 1. | What four mechanisms are used by both OSPF and IS-IS to make flooding reliable? |
| 2. | What events cause an OSPF router to send an LSA to one or more of its neighbors? |
| 3. | Under what circumstances is the destination address of an OSPF Update packet unicast, and under what circumstances is it a multicast address? |
| 4. | What is the flooding scope of an OSPF Update message? |
| 5. | What is the difference between an explicit and implicit OSPF acknowledgment? |
| 6. | What are the advantages and disadvantages of direct and delayed acknowledgments? |
| 7. | Under what two circumstances is an LSA directly acknowledged? |
| 8. | What is the purpose of the OSPF retransmit list and retransmit timer? |
| 9. | Why are retransmitted LSAs always unicast, regardless of network type? ... |
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