P$6.$ Consider our motivation for correcting protocol $rdt2.1.$ Show that the receiver, shown in Figure $3\mathrm{.}60,$ when operating with the sender shown in Figure $3\mathrm{.}11,$ can lead the sender and receiver to enter into a deadlock state, wwhere each is waiting for an event that will never occur.

P$7.$ In protocol $rdt3\mathrm{.}0,$ the ACK packets flowing from the receiver to the