HW 2_MAC_TCP_Mod_S_9

HW 2_MAC_TCP_Mod_S_9 - Prof R Dzhanidze CS M117 HW 2 1...

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Prof. R. Dzhanidze. CS M117. HW # 2 1 UNIVERSITY OF CALIFORNIA, LOS ANGELES CS M117 Students Name__________________ Homework #2 (Due 04/15/09) (HW and solutions must be typed) Theory Section WirelessMAC, TCP 1. (3) RTS and CTS are not used with short packets, even if there is a hidden terminal situation. Why? 2. (3) Should we still use the Contention Window and Binary Backoff with short packets? Explain? 3. (2) Why can a new packet that senses the medium idle go off without using the Contention Window (“direct access if medium is free”) ? 4. (2) Suppose that an 11 Mbps 802.11b LAN is transmitting 64-byte frames back-to-back over a radio channel with a bit error rate of 10 -7 . How many frames per second will be damaged on average?
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Prof. R. Dzhanidze. CS M117. HW # 2 2 5. (2) Consider the effect of using slow start on a line with a 10-msec round-trip time and no congestion. The receive window is 24 KB and the maximum segment size is 2 KB. How long does it take before the first full window can be sent?
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Prof. R. Dzhanidze. CS M117. HW # 2 3 Laboratory Section
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