Stop-and-wait ARQ is a method used in telecommunications to send information between two connected devices. It ensures that information is not lost due to dropped packets and that packets are received in the correct order. It is the simplest kind of automatic repeat-request (ARQ) method. A stop-and-wait ARQ sender sends one fr a me at a time it is a special case of the general sliding window protocol with both transmit and receive window sizes equal to 1. After sending each fr a me, the sender doesn t send any further fr a mes until it receives an acknowledgement (ACK) signal. After receiving a good fr a me, the receiver sends an ACK. If the ACK does not reach the sender before a certain time, known as the timeout, the sender sends the same fr a me again.-Stop-and-wait ARQ is a method used in telecommunications to send information between two connected devices. It ensures that information is not lost due to dropped packets and that packets are received in the correct order. It is the simplest kind of automatic repeat-request (ARQ) method. A stop-and-wait ARQ sender sends one fr a me at a time　it is a special case of the general sliding window protocol with both transmit and receive window sizes equal to 1. After sending each fr a me, the sender doesn t send any further fr a mes until it receives an acknowledgement (ACK) signal. After receiving a good fr a me, the receiver sends an ACK. If the ACK does not reach the sender before a certain time, known as the timeout, the sender sends the same fr a me again.