CNA Practice
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Topic

Reliable Transport

6 questions in this topic.

2013 Q2(a)(iii)Transport LayerReliable Transport· 4 marks

Reliable transport protocols must have at least a unique sequence number for each segment in the window. However, the protocol used can have additional requirements on the minimum unique sequence numbers beyond this requirement. What is the consequence if these minimum requirements are not met? Give an explanation of precisely why or how they will fail. You may use an example of a failure case or an explanation, but must provide either a general explanation that covers both selective repeat and go back n or a failure case for each of the protocols.

GBNSRsequence numbers
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2014 Q2(d)(i)Transport LayerReliable Transport· 3 marks

We looked at three protocols for providing reliable transport: Alternating Bit, Go-Back-N and Selective-Repeat. Assume we have a delay-bandwidth product of 1MByte and a maximum segment size (MSS) of 1KByte. Assume the local memory available for buffering is not a limiting factor. Assuming the send window size has been set to the delay-bandwidth product (with the exception of alternating bit which has been set to the MSS), what would be size of the receiver buffer for each of the protocols?

windowbufferGBNSR
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2014 Q2(d)(ii)Transport LayerReliable Transport· 3 marks

We looked at three protocols for providing reliable transport: Alternating Bit, Go-Back-N and Selective-Repeat. Assume we have a delay-bandwidth product of 1MByte and a maximum segment size (MSS) of 1KByte. Assume the local memory available for buffering is not a limiting factor. Give one advantage for each of the three protocols

GBNSRstop-and-wait
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2015 Q2(d)(i)Transport LayerReliable Transport· 3 marks

We looked at three protocols for providing reliable transport: Alternating Bit, Go-Back-N and Selective-Repeat. Which of these is likely to perform best in the presence of high error rates? Explain.

GBNSRwindow
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2015 Q2(d)(ii)Transport LayerReliable Transport· 3 marks

We looked at three protocols for providing reliable transport: Alternating Bit, Go-Back-N and Selective-Repeat. What is the optimal size for the sending and receiving window for each of these protocols?

windowGBNSR
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2015 Q2(d)(iii)Transport LayerReliable Transport· 3 marks

We looked at three protocols for providing reliable transport: Alternating Bit, Go-Back-N and Selective-Repeat. Given a window size, W , what is the minimum sequence space required for each of these protocols?

sequence numbersGBNSR
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