$6.$ Consider the TCP segment containing the HTTP $$POST$$ as the first segment in

the data transfer part of the TCP connection.

$$ At what time was the first segment $($the one containing the HTTP POST$)$ in

the data$-$transfer part of the TCP connection sent?

$$ At what time was the ACK for this first data$-$containing segment received?

$$ What is the RTT for this first data$-$containing segment?

$$ What is the RTT value the second data$-$carrying TCP segment and its ACK?

$$ What is the EstimatedRTT value $($see Section $3\mathrm{.}5\mathrm{.}3,$ in the text$)$ after the

ACK for the second data$-$carrying segment is received? Assume that in

making this calculation after the received of the ACK for the second segment,

that the initial value of EstimatedRTT is equal to the measured RTT for the

first segment, and then is computed using the EstimatedRTT equation on

page $242,$ and a value of $=0\mathrm{.}125.$

Note: Wireshark has a nice feature that allows you to plot the RTT for

each of the TCP segments sent. Select a TCP segment in the $$listing of

captured packets$$ window that is being sent from the client to the

gaia.cs$.$umass.edu server. Then select: Statistics$->$TCP Stream Graph

$>$Round Trip Time Graph.