6.3B-5. Multiple Access protocols (5). Consider the figure below, which shows the arrival of 6 messages for transmission at different multiple access wireless nodes at times t=0.1, 0.8, 1.35, 2.6, 3.9, 4.2. Each transmission requires exactly one time unit. t=0.0 1 01 U 0 3 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. Hint: consider propagation times carefully here. 4 5 23 t=1.0 U 9 t=2.0 t-3.0 t=4.0 t=5.0

6.3B-5. Multiple Access protocols (5). Consider the figure below, which shows the arrival of 6 messages for transmission at different multiple access wireless nodes at times t=0.1, 0.8, 1.35, 2.6, 3.9, 4.2. Each transmission requires exactly one time unit. t=0.0 1 01 U 0 3 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. Hint: consider propagation times carefully here. 4 5 23 t=1.0 U 9 t=2.0 t-3.0 t=4.0 t=5.0

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

6.3B-5. Multiple Access protocols (5). Consider the figure below, which shows the arrival of 6
messages for transmission at different multiple access wireless nodes at times t=0.1, 0.8, 1.35, 2.6,
3.9, 4.2. Each transmission requires exactly one time unit.
t=0.0
n
[
2
3
t=1.0
4
t=2.0
4
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. Hint: consider propagation times carefully here.
t=3.0
5 6
t=4.0
t=5.0

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