Construct a trace of the operation of protocol $rdt3\mathrm{.}0$ where a sender is to transmit

packets W$,$ X$,$ Y$,$ Z in that order. Let $W$ be lost on the first try and successful on the second try

$($that is$,$ both transmission and acknowledgment successful$)$; let $x$ be successful; let the

acknowledgment for $Y$ be lost on the first try and let $Y$ be successful on the second try; and let $Z$

be successful. Your traces should be along the lines of those in Figure $3\mathrm{.}16($that is$,$ slides $20$ and

$21$ from the lecture on building a reliable data transfer protocol$).$