USC EE 450 - Solutions-Discussion-Problems(1) - D3106136

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USC EE 450 - Solutions-Discussion-Problems(1)

School name University of Southern California

Course Ee 450- Introduction to Computer Networks

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In the above graph we do not show the transmissions from B C that follow after the timeout of F5 since those do not affect the throughput calculations 2 Consider the use of 1000 bits frames on a 1 Mbps satellite link with a 270 msec propagation delay Find the maximum link utilization for a Stop and Wait Flow Control b Continuous Flow Control with window size 7 c Continuous Flow Control with window size 127 Solutions a In S W ARQ only one frame is transmitted per RTT Link Utilization Tf Tf 2Tp 103 106 103 106 0 27 2 0 002 b For Continuous ARQ We are transmitting SWS frames in one RTT hence the link utilization is 7 0 002 0 014

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