![]() In the stop and wait ARQ, the sender also keeps a copy of the currently sending frame so that if the receiver does not receive the frame then it can retransmit it. ![]() ARQ is an error-control strategy that ensures that a sequence of information is delivered in order and without any error or duplications despite transmission errors and losses. In the stop and wait ARQ protocol, ARQ stands for Automatic Repeat Request. So, there is a wait and then the next data frame is transmitted so the name came Stop and Wait ARQ protocol. After the sender receives the ACK from the receiver, it sends the next data frame. The ACK means that the receiver has successfully received the data frame. ![]() The stop and wait ARQ protocol sends a data frame and then waits for an acknowledgment or ACK from the receiver. 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. The stop and wait ARQ is one of the Sliding Window Protocol strategies that is used where reliable in-order delivery of the data frames is required. Now, let us get back to the topic of Stop and Wait ARQ. The flow control protocols involved in the data link layers are as follows: The main work of the data link layer is to convert the data into the form of frames. If the two computer nodes are on the same networks then the data link layer provides a connection between the two nodes. The data link is the second layer of the OSI model which is used for the transmission of the error-free frames from one node to the other node. Now, let us discuss the data link layer briefly so that we can get a better understanding of the Stop and Wait ARQ protocol as it is one of the most widely used protocols of the data link layer to control errors. What is Stop and Wait for ARQ (Automatic Repeat Request)? Advantages and Disadvantages (or limitations) of Stop and Wait for ARQ.Characteristics of Stop and Wait for ARQ.In the stop and wait ARQ, both the sender and the receiver have windows of the same size i.e. So, there is a wait and then the next data frame is transmitted so the name came to be Stop and Wait ARQ protocol. 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.
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