cp5601t3 - acknowledgment (R next acknowledges all frames...

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CP5610 tutorial 3 (from textbook chapter 5) 5.12 In Stop-and-Wait ARQ why should the receiver always send an acknowledgment message each time it receives a frame with the wrong sequence number? 5.13 Discuss the factors that should be considered in deciding whether an ARQ protocol should act on a frame in which errors are detected. 5.25 Consider the Go-Back-N ARQ protocol. a. What can go wrong if the ACK timer is not used? b. Show how the frame timers can be maintained as an ordered list where the time-out instant of each frame is stated relative to the time-out value of the previous frame. c. What changes if each frame is acknowledged individually instead of by using a cumulative
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Unformatted text preview: acknowledgment (R next acknowledges all frames up to R next 1)? 5.29 Three possible strategies for sending ACK frames in a Go-Back-N setting are as follows: send an ACK frame immediately after each frame is received, send an ACK frame after every other frame is received, and send an ACK frame when the next piggyback opportunity arises. Which of these strategies are appropriate for the following situations? a. An interactive application produces a packet tokeystroke that it receives from the client. b. A bulk data transfer application where a server sends a large file that is segmented in a number of full-size packets that are to be transferred to the client....
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This note was uploaded on 04/07/2010 for the course CP 1500 taught by Professor Cue during the Three '09 term at James Cook.

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