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Consider the following scenario: S1 and S2 send constant bit rate(CBR)UDP traffic to the common destination D, using IEEE 802.11(DCF). (a) Scenario 1: consider S1,

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Consider the following scenario: S1 and S2 send constant bit rate(CBR)UDP traffic to the common destination D, using IEEE 802.11(DCF). (a) Scenario 1: consider S1, S2, and D are within receive range of each other, i.e., S1 and S2 can hear each other as well. Assume the basic CSMA scheme is used (no RTS/CTS is used). Describe a collision (what happens before, during, and after). Name three factors that the collision probability depends on. (b) Scenario 2: Consider that S1 and S2 are hidden from each other, only D hears both (S1 cannot even sense S2, and vice versa) Assume the basic CSMA scheme is used(no RTS/CTS is used). How does the collision likelihood and throughput change compared to scenario I? When RTS/CTS are used, what are the changes to the likelihood of collision, throughput, and fairness

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