Use “A1, 0” denote a frame with data A1 and sequence 0. Suppose each data frame needs 1 ms to transmit and each ack frame needs no time to transmit. The three data frames sent by A are denoted as A1, A2, A3. There are three flow control approaches, namely Stop and Wait, GoBackN and Selective Repeat. Stop-and-Wait ARQ Example Assume that computer A sends 3 frames to computer B. (continued) Algorithm 11.5Sender-site algorithm for Stop-and-Wait ARQĪlgorithm 11.6Receiver-site algorithm for Stop-and-Wait ARQ Protocol Rn is the sequence number of the next packet expected Ideal channel without any error/lost or congestion A B B1 B2 B3 A1 A2 A3Īlgorithm 11.5Sender-site algorithm for Stop-and-Wait ARQ (continued) Use “A1, (0,1)” denote a frame with data A1 and sequence 0, ack 1. Suppose each data frame needs 1 ms to transmit and each ack-only frame needs no time to transmit.
They use duplex Stop-and-Wait ARQ for the communication, i.e., each data frame has a sequence # field and an Ack # field. The three data frames sent by A are denoted as A1, A2, A3 and the frames from B are B1, B2, B3. Go-Back-N ARQ A B 0 1 2 3 4 5 6 7 0 f0 0 1 2 3 4 5 6 7 8 f1 Time out f2 discarded f0 f1 discarded Time out ACK 1 f2 0 1 2 3 4 5 6 7 8 0 1 2 3 4 5 6 7 0 ACK 2 f1 f2 discarded f3 discarded 0 1 2 3 4 5 6 7 8 ACK 4 … 0 1 2 3 4 5 6 7 0 f4 ACK 5 0 1 2 3 4 5 6 7 8 Time out f4 … 0 1 2 3 4 5 6 7 0 discarded ACK 5ĭuplex Communication with Stop-and-Wait ARQ Assume that computer A and computer B communicate with each other. Stop and Wait ARQ A B f0 Time out f0 accepted ACK 1 f1 accepted ACK 0 f1 discarded ACK 0 f0 accepted ACK 1 f1 f1 accepted Time out ACK 0 discarded Stop and Wait in ideal channel (no error) A B f0 ACK 1 f1 ACK 0 f1 ACK 0 f0 ACK 1 Simplest (ideal channel, no error) A B f0 f1 f2 f3 f4 This study assumes that the input for the data traffic is. Stop and wait protocol is an error control protocol, in this protocol the sender sends data packets one at a time and waits for positive acknowledgment from the receiver’s side, if acknowledgment is received then the sender sends the next data packet else it’ll resend the previous packet until a positive acknowledgment is not received.
Stop and wait arq windows#
Show the flow of frames exchanged between the two nodes, and the status of the windows after the transmission/reception of each information/control frame, if the field of sequence number is three-bit-length, and the sender and receiver are using the maximum possible window size, for the following data link control techniques: In this study, the performance of an integrated packet voice/data multiplexer using a Stop and Wait (SW) ARQ protocol is discussed. Frame 0 is corrupted, the ACK of frame 1 is corrupted, ACK of frame 4 arrived after the time of frame 4 expired. STOP AND WAIT ARQ STOP WAIT AND Team members DNAA Krazzy4 Nishita Ananya Archana Dhanusha Royston Aayush Himanshu Awesum4sum Vinayak Lisha Anita Prabha Car. The file has been fragmented in 5 frames.
Assume that a file is transferred from a node A to a node B.
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