Sender side
Rule 1: Sender sends one data packet at a time.
Rule 2: Sender sends the next packet only when it receives the acknowledgment of the previous packet.
Therefore, the idea of stop and wait protocol in the sender's side is very simple, i.e., send one packet at a time, and do not send another packet before receiving the acknowledgment.
Receiver side
Rule 1: Receive and then consume the data packet.
Rule 2: When the data packet is consumed, receiver sends the acknowledgment to the sender.
Therefore, the idea of stop and wait protocol in the receiver's side is also very simple, i.e., consume the packet, and once the packet is consumed, the acknowledgment is sent. This is known as a flow control mechanism.
option-C
