Bit: 4 10 16 31 Source Port Destination Port Sequence Number Acknowledgement Number Header Length Window nuse Checksunm Urgent Pointer Options + Padding TCP header true true true true false - the checksum is the number of 1s sent in the message false - checksum is used for error checking false - padding is used to check for errors in the options ficlds false - if the source port and destination port match, then there is an error Record