CHAPTER 4 Network Layer

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CHAPTER 4 Network Layer

CHAPTER 4Network LayerReview Questions1. Host-to-host delivery is delivery of the packet from the source host to the destinationhost. Application-to-application delivery is delivery of the packet from theprocess running on the source host to the process running on the destination host.2. The network layer lies below the transport layer and above the data link layer.3. Addressing, routing, and packetizing.4. The netid identifies the network; the hostid identifies the connection of a device(such as a computer or printer) on a network.5. Subnets are needed in large organizations as a method to group stations together.Subnets provide security and efficiency. Also, they are cost-efficient and are easierto troubleshoot than a non-subnetted network.6. A port number identifies a process running on a computer. An IP address uniquelyidentifies a station’s connection to a network.7. The Domain Name System maps an IP address to an application layer address.8. The application layer addresses are distributed in multiple computers throughoutthe world.9. In host-specific routing the routing table contains entries for destination hosts. Innetwork-specific routing the table contains entries for destination networks.10. An autonomous system is a group of networks and routers under the authority of asingle administration.11. Changes to a static routing table are made manually by an administrator. Changesto a dynamic routing table are updated automatically by the software.12. RIP and OSPF are two interior routing protocols. BGP is an exterior routing protocol.13. IP packets are called datagrams.14. A datagram is fragmented if it is larger than the network’s MTU.1


2 CHAPTER 4 NETWORK LAYERMultiple-Choice Questions15. a16. a17. b18. d19. b20. a21. c22. c23. b24. a25. a26. b27. c28. c29. b30. b31. c

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