data carried during TCP control flow
The data that will be carried in the 4th segment is 1200 why?we can know it by simpley look at the sequence number of the 6th packet -a packet's sequence number is in simple words:"im sending data from this certain number"
if we take a look at the 3th packet we can see that it was sent from the client to the server with a sequence number of 1030 and we can see in the 6th packet that the sequence number of it is 2230 which means a total 2230-1030=1200 of data was sent from the clinet to server in the 4th packet