Q$\mathrm{.}2$ Consider TCP Reno protocol to examine the behavior of congestion window size. Initially, $($Transmission round, Window size$)$ is $(1,$ MSS$).$ Assuming threshold ssthresh is set after first timeout. If first time out is occurred at $6$th transmission round $($starts from $1$st$).$ Determine the following by providing a short discussion justifying your answer:

$($a$)$ Show the diagram for window size up to $26$th transmission round; assume that first, $3$ duplicate ACKs are detected at transmission round $18$th$.$ No loss event occurred till $26$th transmission round, thereafter.

$($b$)$ What are the values of ssthresh at the $17$th and $20$th transmission rounds, respectively?

$($c$)$ What is average throughput for transmission round between $19$th to $26$th$.$ Assume that MSS and RTT are $512$ Bytes and $200$ msec, respectively.