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0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 + Source port 22 23 24 25 26 27 Destination port U Data offset Reserved G Checksum Sequence number Acknowledgment number Options 28 29 30 31 Window Urgent pointer Padding Figure 5.17: TCP header Note: Each tick mark represents a bit position Refer to figure 5-17 which shows the TCP header. Compare the roles of the sequence number with the acknowledgment number and explain why we need both.

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