Chapter14 - CHAPTER 14 Unicast Routing Protocols (RIP,...

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1 CHAPTER 14 Unicast Routing Protocols (RIP, OSPF, and BGP) Exercises 1. RIP is an intradomain routing protocol that enables routers to update their routing tables within an autonomous system. 3. The expiration timer is 6 times that of the periodic timer to allow for some missed communication between routers. 5. The two major shortcomings are two-node instability and three-node instability. For the former, infinity can be re-defined as a number such as 20. Another solution is the split horizon strategy or split horizon combined with poison reverse. These methods do not work for three-node instability. 7. In distance vector routing each router sends all of its knowledge about an autono- mous system to all of the routers on its neighboring networks at regular intervals. It uses a fairly simple algorithm to update the routing tables but results in a lot of unneeded network traffic. In link state routing a router floods an autonomous sys- tem with information about changes in a network only when changes occur. It uses
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Chapter14 - CHAPTER 14 Unicast Routing Protocols (RIP,...

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