Stop and wait arq8/3/2023 ![]() The receiver sends the NAK signal back to the transmitter as soon as it detects an error. The stop and wait ARQ is used for noisy channels or links and it manages the flow and error control between the sender and the receiver. It transmits the codewords continuously until it receives the NAK signal from the receiver. The stop and wait ARQ is one of the Sliding Window Protocol strategies that is used where reliable ordered delivery of the data frames is required. In a selective repeat ARQ system, the transmitter does not wait for an ACK signal for the transmission of the next codeword. In this protocol, only the specified, damaged, or lost frame is retransmitted. We keep a copy of the frames until the acknowledgement receives. Stop-and-wait ARQ, also referred to as alternating bit protocol, is a method in telecommunications to send information between two connected devices. In this protocol, we can send several frames before receiving an acknowledgement. Stop-and-Wait ARQ Protocol Neso Academy 1.97M subscribers Join Subscribe 3.4K 195K views 2 years ago Computer Networks Computer Networks: Stop-and-Wait ARQ Protocol in Computer Networks Topics. Go-Back NARQ protocol is also known as Go-back N-automatic repeat request. ![]() ![]() Error correction in stop and wait ARQ is done by keeping a copy of the sent frame and retransmitting the frame when the time expires.ĭrawback: It is a very inefficient mechanism because at one moment only one frame is transmitted. Stop & Wait ARQ assumes that the communication channel is noisy (previously Stop & Wait assumed that the communication channel is not noisy). Lost frames are needed to be resent in this protocol. Stop & Wait ARQ is a sliding window protocol for flow control and it overcomes the limitations of Stop & Wait, we can say that it is the improved or modified version of Stop & Wait protocol. When the frame arrives at the receiver site, it is checked and if it is corrupted, then discarded. To detect and correct corrupted frames, we need to add redundancy bits to our data frame. Stop and wait ARQ, adds a simple error control mechanism to the stop and wait protocol. It stands for stop and wait automatic repeat request. The sliding window protocols in computer networks is further divided into three categories as follows: Stop and Wait ARQ Protocol ![]() The sender has to keep waiting for acknowledgements before sending the processed next packet. Using these protocols, we can send multiple frames at a time. Characteristics of Stop and Wait ARQ: It uses a link between sender and receiver as a half-duplex link Throughput 1 Data packet/frame per RTT If the BandwidthDelay product is very high, then they stop and wait for protocol if it is not so useful. At the destination end, the sequence number is used to find the missing frames. In this mechanism, a frame is sent with a sequence number. Both the sender and the receiver use a sliding. Sliding window protocol in computer networks is used for noisy channels. Connection-oriented protocol called the Stop-and-Wait protocol, which uses both flow and error control. Sliding Window Protocol in Computer Networks ![]()
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