$3\mathrm{.}5-2$ TCP segment format. For the given function of a field in the TCP segment,

select the name of that field from the pull$-$down list.

This field contains the

number of available bytes in

the TCP receiver's buffer.

This field contains the

index in the sender$-$to$-$

receiver byte stream of the

first byte of that data in the

payload carried in this

segment.

This field contains the port

number associated with the

sending socket for this TCP

segment.

Source port number

If set, this segment

cumulatively ACKs all data

bytes up to$,$ but not

including, the byte index in

Data $($or payload$).$

the ACK value field of this

Sequence number

segment.

ACK number field

ACK bit

This field contains

Receiver advertised window