In the generic SR protocol that we studied in Section 3.4.4, the sender transmits a message as

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In the generic SR protocol that we studied in Section 3.4.4, the sender transmits a message as soon as it is available (if it is in the window) without waiting for an acknowledgment. Suppose now that we want an SR protocol that sends messages two at a time. That is, the sender will send a pair of messages and will send the next pair of messages only when it knows that both messages in the first pair have been received correctly.
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Computer Networking A Top-Down Approach

ISBN: 978-0136079675

5th edition

Authors: James F. Kurose, Keith W. Ross

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