6.3-4. Multiple Access protocols (d). Consider the figure below, which shows the arrival of 6 messages for transmission at different multiple access wireless nodes at times t = 0.3, 1.7, 1.8, 2.5, 4.2, 4.6. Each transmission requires exactly one time unit. t=0.0 0 1 0 5 □ 6 t=1.0 4 23 t=2.0 For the CSMA/CD protocol (with 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 and that that node will not attempt a retransmission of that packet until sometime after t=5. If a node senses a collision, it stops transmitting immediately (although it will still take .2 time units for the last transmitted bit to propagate to all other nodes). Hint: consider propagation times carefully here. (Note: You can find more examples of problems similar to this here B.) t=3.0 5 t=4.0 6 t=5.0

Computer Networking: A Top-Down Approach (7th Edition)
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ISBN:9780133594140
Author:James Kurose, Keith Ross
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Chapter1: Computer Networks And The Internet
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6.3-4. Multiple Access protocols (d). Consider the figure below, which shows the arrival of 6
messages for transmission at different multiple access wireless nodes at times t = 0.3, 1.7, 1.8, 2.5,
4.2, 4.6. Each transmission requires exactly one time unit.
t=0.0
0 1
r
U
U
5
n
6
st
For the CSMA/CD protocol (with 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 and that that node will not attempt a retransmission of that packet until sometime
after t=5. If a node senses a collision, it stops transmitting immediately (although it will still take .2
time units for the last transmitted bit to propagate to all other nodes). Hint: consider propagation
times carefully here. (Note: You can find more examples of problems similar to this here B.)
4
3
1
2
t=1.0
23
t=2.0
t=3.0
5
t=4.0
6
t=5.0
Transcribed Image Text:6.3-4. Multiple Access protocols (d). Consider the figure below, which shows the arrival of 6 messages for transmission at different multiple access wireless nodes at times t = 0.3, 1.7, 1.8, 2.5, 4.2, 4.6. Each transmission requires exactly one time unit. t=0.0 0 1 r U U 5 n 6 st For the CSMA/CD protocol (with 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 and that that node will not attempt a retransmission of that packet until sometime after t=5. If a node senses a collision, it stops transmitting immediately (although it will still take .2 time units for the last transmitted bit to propagate to all other nodes). Hint: consider propagation times carefully here. (Note: You can find more examples of problems similar to this here B.) 4 3 1 2 t=1.0 23 t=2.0 t=3.0 5 t=4.0 6 t=5.0
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