SolStd22 - CHAPTER 22 Network Layer: Delivery, Forwarding,...

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1 CHAPTER 22 Network Layer: Delivery, Forwarding, and Routing Solutions to Odd-Numbered Review Questions and Exercises Review Questions 1. We discussed two different methods of delivery: direct and indirect. In a direct delivery , the final destination of the packet is a host connected to the same physical network as the deliverer. In an indirect delivery the packet goes from router to router until it reaches the one connected to the same physical network as its final destination. 3. A routing table can be either static or dynamic. A static routing table contains information entered manually. A dynamic routing table is updated periodically by using one of the dynamic routing protocols such as RIP, OSPF, or BGP. 5. A RIP message is used by a router to request and receive routing information about an autonomous system or to periodically share its knowledge with its neigh- bors. 7. The hop count limit helps RIP instability by limiting the number of times a mes- sage can be sent through the routers, thereby limiting the back and forth updating that may occur if part of a network goes down. 9. In OSPF, four types of links have been defined: point-to-point, transient, stub, and virtual. A point-to-point link connects two routers without any other host or router in between. A
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This note was uploaded on 09/16/2010 for the course SETAS ETEC301 taught by Professor Multiple during the Winter '09 term at Centennial College.

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SolStd22 - CHAPTER 22 Network Layer: Delivery, Forwarding,...

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