Sept13 - CSE/ECE404 Computer Networks Instructor Dr Liang...

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Unformatted text preview: CSE/ECE404: Computer Networks Instructor: Dr. Liang Cheng Department of Computer Science and Engineering P.C. Rossin College of Engineering & Applied Science Lehigh University September 13, 2007 Instructor: Dr. Liang Cheng CSE/ECE404: Computer Networks 09/13/07 Outline ¡ Recap ¡ Stop-and-wait ARQ protocol ¡ Sliding window ARQ protocol ¡ Individual project introduction ¡ ARQ efficiency ¡ Summary and homework Instructor: Dr. Liang Cheng CSE/ECE404: Computer Networks 09/13/07 Stop-and-Wait ARQ Protocol Node A Node B 1 Packets out RN SN 1 1 1 2 2 2 3 3 Instructor: Dr. Liang Cheng CSE/ECE404: Computer Networks 09/13/07 Correctness of An Algorithm ¡ Safety ¡ An algorithm never produces an incorrect result ¡ Liveness ¡ An algorithm is live if it can continue forever to produce results Instructor: Dr. Liang Cheng CSE/ECE404: Computer Networks 09/13/07 Sliding-window ARQ Protocol ¡ Difference from stop-and-wait ARQ ¡ Sender: several (n) successive packets can be sent without waiting for the next packet...
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Sept13 - CSE/ECE404 Computer Networks Instructor Dr Liang...

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