434hw6sol

434hw6sol - 1 CSE 434 TTh 9:15 AM Homework #6 Sample...

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Unformatted text preview: 1 CSE 434 TTh 9:15 AM Homework #6 Sample Solution December 2, 2003 Please email Catherine ( cwen@asu.edu ) if you have questions. (10 points for each question) 1. (6.5) Why does the maximum packet lifetime, T, have to be large enough to ensure that not only the packet but also its acknowledgement have vanished? The reason why T must be large enough to ensure that both the packets and acknowledgements have vanished is to deter duplicate packets from being introduced into the network. (6.6) Imagine a two-way handshake rather than a three-way handshake were used to set up connections. In other words, the third message was not required. Are deadlocks now possible? Give an example or show that none exist. Deadlocks are possible. For example given the following scenario: A packet arrives at destination A, out of the blue, A acknowledges it and the acknowledgement gets lost. B also gets a package out of the blue, B also acknowledges it and the acknowledgement also gets lost. Therefore A and B now have connections left open. Since both are now...
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434hw6sol - 1 CSE 434 TTh 9:15 AM Homework #6 Sample...

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