6.3A-3. Multiple Access protocols (3). Consider the figure below, which shows the arrival of 6 messages for transmission at different multiple access wireless nodes at times t-0.1, 1.4, 1.8, 3.2, 3.3, 4.1. Each transmission requires exactly one time unit. t=0.0 U U 1 n n 5 3 1 For the CSMA protocol (without collision detection), indicate which packets are successfully transmitted. You should assume that it takes .2 time units for a signal to propagate from one node to each of the other nodes. You can assume that if a packet experiences a collision or senses the channel busy, then that node will not attempt a retransmission of that packet until sometime after t=5. Hint: consider propagation times carefully here. (Note: You can find more examples of problems similar to this here B.) 4 9 t=1.0 2 2 3 t=2.0 45 t=3.0 6 t=4.0 t=5.0

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