TCP Header Ports are Source port Destination port associated with OS Sequence number processes Acknowledgment IP source destination HdrLenlo Flags Advertised window addresses plus TCP source and destination Checksum Urgent pointer ports uniquely identifies a tcP connection Options(variable) Some port numbers are Data well knowni”/ reserved e.g.port80=http 43TCP Header Ports are associated with OS processes IP source & destination addresses plus TCP source and destination ports uniquely identifies a TCP connection Some port numbers are “ we ll known” / reserved e.g. port 80 = HTTP 43 Source port Destination port Sequence number Acknowledgment HdrLen 0 Flags Advertised window Checksum Urgent pointer Options (variable) Data