Question $3$

Fig. $3$ shows a plot of TCP Reno window size as a function of time $($transmission

round$).$ Answer all the following questions, briefly justifying your answers.

Fig. $3$

A$.$ Identify the interval$($s$)$ of time when TCP slow start is operating.

B$.$ Identify the interval$($s$)$ of time when TCP congestion avoidance is operating.

C$.$ Explain why TCP behaves in this manner at the $4$th transmission round. $(5$ marks$)$

D$.$ What is the value of the TCP slow start Threshold at the $6$th transmission round?