TCP Header Starting Source port Destination port sequence number(byte Sequence number ofset) of data Acknowledgment carried in this packet HdrLen 0 Flags Advertised window Checksum Urgent pointer Byte stream numbered Options(variable) independently in each direction Data Sequence number assigned to start of byte stream is picked when connection begins; doesn't start at o 4646 TCP Header Starting sequence number (byte offset) of data carried in this packet Source port Destination port Sequence number Acknowledgment HdrLen 0 Flags Advertised window Checksum Urgent pointer Options (variable) Data Byte stream numbered independently in each direction Sequence number assigned to start of byte stream is picked when connection begins; doesn’t start at 0