Question 21
Some ICMP packets include portions of the original packet that triggered the ICMP response.
Question 22
Both sides of a TCP connection must negotiate a common receive window size value.
Question 23

What might be the purpose of thistraffic?
Question 24
What is the most efficient method for saving non-contiguous packets in a trace file?
Question 25
The IPv4 Total Length field defines the length of the IP header, valid data and data link padding.