sentences:  Hence, even though it receives RTS from node D, it does not reply back with CTS.Node D assumes that its RTS was not successful because of collision and hence proceeds to "back off" (using an exponential backoff algorithm).If A has multiple data fragments to send, the only instant when node D successfully can initiate a data transfer is during small gaps in between that node A has completed data transfer and completion of node B next CTS (for node A next data transfer request).