However, as the receiver accepts out-of-sequence segments, a sending window of 2n 1 segments is not sufficient to ensure a reliable delivery of all segments. A similar problem occurs with selective repeat. It is easy to see thatthis problem can be avoided if the maximum size of the sending window is 2n □ 1 segments. The sender will retransmit all segments and they will all be accepted by the receiver and delivered a second time to the user. These segments are received in-sequence by the destination, but all the returned acknowledgements are lost. Consider first go-back-n and assume that a sender sends 2n segments. However, to ensure a reliable delivery of the segments, go-back-n and selective repeat cannot use a sending window of 2n segments. Note: Maximum window size with go-back-n and selective repeat A transport protocol that uses n bits to encode its sequence number can send up to 2n different segments. However, this segment should not be removed from the sending buffer before the reception of a cumulative acknowledgement (C(OK,2) in the figure above) that covers this segment. It also knows that segment D(2.) has been received and can cancel the retransmission timer associated to this segment. In the figure above, when the sender receives C(OK,0,), it knows that all segments up to and including D have been correctly received. Such acknowledgements are sometimes called selective cknowledgements. For example,the receiver could add in he returned acknowledgement the list of the sequence numbers of all segments that have already been received. A possible solution to improve the performance of selective repeat is to provide additional information about the received segments in the cknowledgements that are returned by the receiver. Telugu sarasamaina kathalu online, telugu bhutu kathalu com, kathalu in telugu pdf, telugu buthu kathalu in, telugu boothu kathalu and boothu videolu, telugu kamakeli kathalu, telugu puku kathalu in telugu, telugu lo boothu kathalu pdf, boothukathalu, telugu pooku kathalu in telugu, puku kadalu, puku telugu, telugu boothu kathalu boothu videolu, telugu kathalu aunty, lanjala kathalu telugu pdf, telugu boothu kathalu soumya reddy, puku bommalu and kathalu, telugu pdf boothu kathalu, telugu kathalu, telugu dengudu kathalu in pdf, telugu boothu kathalu in telugu.Įxplicitly the sender of the reception and the sender could retransmit this segment although it has already been received.
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