SolStd20 - CHAPTER 20 Network Layer: Internet Protocol...

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1 CHAPTER 20 Network Layer: Internet Protocol Solutions to Odd-Numbered Review Questions and Exercises Review Questions 1. The delivery of a frame in the data link layer is node-to-node. The delivery of a packet at the network layer is host-to-host . 3. Each data link layer protocol has a limit on the size of the packet it can carry. When a datagram is encapsulated in a frame, the total size of the datagram must be less than this limit. Otherwise, the datagram must be fragmented . IPv4 allows fragmentation at the host and any router; IPv6 allows fragmentation only at the host. 5. Options can be used for network testing and debugging. We mentioned six options: no-operation, end-of-option, record-route, strict-source-route, loose- source-route, and timestamp. A no-operation option is a 1-byte option used as a filler between options. An end-of-option option is a 1-byte option used for padding at the end of the option field. A record-route option is used to record the Internet routers that handle the datagram. A strict-source-route option is used by the source to predetermine a route for the datagram. A loose-source-route option is similar to the strict source route, but it is less rigid. Each router in the list must be visited, but the datagram can visit other routers as well. A
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SolStd20 - CHAPTER 20 Network Layer: Internet Protocol...

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