stop and wait protocol simple program in c

In this case, the sender doesn't receive the ACK, times out, and sends the frame again. One problem is when the ACK sent by the receiver is damaged or lost. If the receiver sees that the frame is damaged, the receiver discards it and does not send an ACK-pretending that the frame was completely lost, not merely damaged. If the receiver sees that the frame is good, it sends an ACK. The receiver uses the redundancy check number to check for possible damage. Typically the transmitter adds a redundancy check number to the end of each frame. However, real-life implementations vary to address certain issues of design. The above behavior is a basic example of Stop-and-Wait. The timeout countdown is reset after each frame transmission. If the ACK does not reach the sender before a certain time, known as the timeout, the sender sends the same frame again. After receiving a valid frame, the receiver sends an ACK. After sending each frame, the sender doesn't send any further frames until it receives an acknowledgement (ACK) signal. A stop-and-wait ARQ sender sends one frame at a time it is a special case of the general sliding window protocol with transmit and receive window sizes equal to one in both cases.

It is the simplest automatic repeat-request (ARQ) mechanism. It ensures that information is not lost due to dropped packets and that packets are received in the correct order. Stop-and-wait ARQ, also referred to as alternating bit protocol, is a method in telecommunications to send information between two connected devices. Basic automatic repeat-request (ARQ) data transmission and error detection protocolĪ diagram of the Stop-and-Wait ARQ protocol and its operation in various cases.

Stop and wait protocol simple program in c