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hw2_solution - ,thenTCPs RTT 500 bytes,aslongas...

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1 The rate at which TCP sends data is a function of the congestion window and the current RTT. When the window size is w bytes and the current round trip time is RTT seconds, then TCP’s transmission rate is roughly RTT . So during the i th RTT, we sent W ൈ 500 bytes , as long as W ൈହ଴଴ൈ଼ RTT ൑ 500kbps We have W ൌ W ୧ିଵ ൅ 10, W ൌ 1, so W ൌ 1 ൅ 10i; RTT ൌ 250ms So ሺଵାଵ଴୧ሻൈହ଴଴ൈ଼ ଶହ଴ൈଵ଴ షయ ൑ 500kbps ฺ i ൑ 3 , which means once the window size increases to 41, packet lost will happen, then the window size will drop to 1 again. Assume during the RTT period in which the windows size is 41, the transmit throughput is 500kbps, we have: C ୟ୴୥ ሺ∑ W ሻ ൈ 500 ൈ 8 ୧ୀ଴ ൅ 500 ൈ 10 ൈ RTT 5RTT ൌ 304.8 ൈ 10 bps The average capacity that we can transmit through this TCP channel is 304.8kbps.
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