Bit:4 10 16 31 Source Port Destination Port Sequence Number Acknowledgement Number HeaerUsedFlags Length nuse Window Checksum Urgent Pointer Options Padding TCP header true true true true false- the checksum can be a positive or negative number false - checksum is used for error checking false - the checksum is the number of 1s sent in the message false- There are 4 gig of TCP sequence number