*acket+- will be sent and be received and so on. !stop"n"wait! protocol can be shown as below in nam. How it is shown in nam (network animator). #o support thisfeature, the senderkeeps timer per eachpacket.ģ. Sendertimesout and retransmitsthat packet again.#here are two caseswhen the senderdoesn&t receive A$%'ne is when theA$% is lost and theother is when theframe itself is nottransmitted. If the sender doesn&treceive A$% forprevious sent packetafter a certain periodof time, the
Inthis way, the sender can recognie that theprevious packet is transmitted successfuly andwe could say !stop"n"wait! guarantees reliabletransfer between nodes.#o support this feature, the sender keeps arecord of each packet it sends.Also, to avoid confusion caused by delayed orduplicated A$%s, !stop"n"wait! sends eachpackets with unique sequence numbers and Retransmission") is the fundamental technique to provide reliable transferunder unreliable packet delivery system.Īfter transmitting one packet, the sender waitsįrom thereceiver before transmitting the next one.
"stop-n-wait"(sometimes known as "positive acknowledgement with
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