Consider a scenario in which Host A wants to simultaneously send packets to Host B and C. A is connected to B and C via a broadcast channel a packet sent by A is carried by the channel to both B and C. Suppose that the broadcast channel connecting A,B, and C can independently lose and corrupt packets (and so, for example, a packet sent from A might be correctly received by B, but not by C).

Design a stop-and-wait-like error-control protocol for reliably transferring packets from A to B and C, such that A will not get new data from the upper layer until it knows that both B and C have correctly received the current packet. Give FSM description of A and C.

(Hint: The FSM for B should be essentially same as for C.) Also, give a description of the packet format(s) used.