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Computer Networking : A Top-Down Approach

Computer Networking : A Top-down Approach

Authors: James F. Kurose, Keith W. Ross
ISBN: 9780132856201
Edition: 6
Chapter: Transport Layer
Exercise: Problems
Question: 16

 

Question

Suppose an application uses rdt 3.0 as its transport layer protocol. As the stop- and-wait protocol has very low channel utilization (shown in the cross- country example), the designers of this application let the receiver keep sending back a number (more than two) of alternating ACK 0 and ACK 1 even if the corresponding data have not arrived at the receiver. Would this application design increase the channel utilization? Why? Are there any potential problems with this approach? Explain.

Answer

  • Suppose an application uses rdt 3.0 as its transport layer protocol. Then It stop-and-wait protocol is used very low utilization in the application.
  • The application allows the receiver to send the acknowledgements and sends the next data packet. It is used as a pipelined data in the channel.
  • There is a chance of missing data before it reaches the receiver.
  • So the sender (who is using rtd 3.0 protocol) will not retransmit the data. The  missing or lost some data.

  • Thus, designing of the application need to adopt some mechanism to over come this problem.

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