> Send message 의 Source port가 Receive message의 Destination port다. Describe the relationship between the port numbers in the two packets. (Hint: for a second packet to be sent in response to a first packet, the sender of the first packet should be the destination of the second packet). Examine a pair of UDP packets in which your host sends the first UDP packet and the second UDP packet is a reply to this first UDP packet. To answer this question, you’ll need to look into the Protocol field of the IP datagram containing this UDP segment (see Figure 4.13 in the text, and the discussion of IP header fields). What is the protocol number for UDP? Give your answer in both hexadecimal and decimal notation. What is the largest possible source port number? (Hint: see the hint in 4.) ![]() What is the maximum number of bytes that can be included in a UDP payload? (Hint: the answer to this question can be determined by your answer to 2. > Length field 의 값은 8개의 header Byte와 packet에 캡슐화 된 나머지 data Byte의 합이다. Verify your claim with your captured UDP packet. The value in the Length field is the length of what? (You can consult the text for this answer). By consulting the displayed information in Wireshark’s packet content field for this packet, determine the length (in bytes) of each of the UDP header fields.ģ. ![]() Source Port, Destination Port, Length, Checksum.Ģ. (You shouldn’t look in the textbook! Answer these questions directly from what you observe in the packet trace.) Name these fields. From this packet, determine how many fields there are in the UDP header.
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