Sol21 - CHAPTER 21 Network Layer Address Mapping Error...

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1 CHAPTER 21 Network Layer: Address Mapping, Error Reporting, and Multiplexing Solutions to Review Questions and Exercises Review Questions 1. The size of an ARP packet is variable , depending on the length of the logical and physical addresses used. 2. ARP Packet Size = 2 + 2 + 1 + 1 + 2 + 6 + 4 + 6 + 4 = 28 bytes 3. The size of the ARP packet in Question 2 is 28 bytes. We need to pad the data to have the minimum size of 46 . The size of the packet in the Ethernet frame is then calculated as 6 + 6 + 2 + 46 + 4 = 64 bytes (without preamble and SFD). 4. The broadcast for Ethernet is all 1s or 0xFFFFFFFFFFFF . 5. This restriction prevents ICMP packets from flooding the network. Without this restriction an endless flow of ICMP packets could be created. 6. The IP header is included because it contains the IP address of the original source. The first 8 bytes of the data are included because they contain the first section of the TCP or UDP header which contains information about the port numbers (TCP and UDP) and sequence number (TCP). This information allows the source to direct the ICMP message to the correct application. 7. A host would never receive a redirection message if there is only one router that connects the local network to the outside world. 8. The minimum size of an ICMP packet is 8 bytes (router solicitation packet). The largest of the ICMP packets is the router advertisement packet with up to 255 list- ings. The maximum size is then: 255 listings × 8 bytes/listing + 8 bytes for the ICMP header = 2048 bytes 9.
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This homework help was uploaded on 04/18/2008 for the course JAVA CDA 4506 taught by Professor Eisler during the Spring '08 term at University of Central Florida.

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Sol21 - CHAPTER 21 Network Layer Address Mapping Error...

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