**6.3B-4. Multiple Access Protocols (4).**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.![Diagram of message arrivals at multiple access nodes](diagrams.png)- The diagram shows a timeline starting from \( t=0.0 \) to \( t=5.0 \).- Each node is represented with a red circle containing a number indicating the order of message arrivals. There are six total nodes/messages plotted across the timeline.- Nodes/messages are marked at specific times: 1. Node 1 at \( t=0.1 \) 2. Node 2 at \( t=0.8 \) 3. Node 3 at \( t=1.35 \) 4. Node 4 at \( t=2.6 \) 5. Node 5 at \( t=3.9 \) 6. Node 6 at \( t=4.2 \)Again consider the **CSMA protocol (without collision detection)**, and indicate those packets where the channel is sensed busy and therefore, under CSMA, *that message transmission is not attempted*. [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, that node will not attempt a retransmission of that packet until sometime after \( t=5 \). Hint: consider propagation times carefully here].- 1 ☐- 2 ☐- 3 ☐- 4 ☐- 5 ☐- 6 ☐This setup requires the analysis of CSMA timing and careful consideration of when each node senses the channel as busy due to the propagation delay.

In Ethernet networks, the CSMA/CD network protocol is used to control access to a common…

6.3B-4. Multiple Access protocols (4). 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 U U 1 2 3 4 Again consider the CSMA protocol (without collision detection), indicate those packets where the channel is sensed busy and therefore, under CSMA, that message transmission is not attempted. [Again, 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. Hint: consider propagation times carefully here]. 5 23 6 t=1.0 t=2.0 t-3.0 5 6 t=4.0 t=5.0

6.3B-4. Multiple Access protocols (4). 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 U U 1 2 3 4 Again consider the CSMA protocol (without collision detection), indicate those packets where the channel is sensed busy and therefore, under CSMA, that message transmission is not attempted. [Again, 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. Hint: consider propagation times carefully here]. 5 23 6 t=1.0 t=2.0 t-3.0 5 6 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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Concept explainers

Network transmission cabling

A network is a collection of devices connected by communication links. A device can be a computer or any instrument capable of sending and receiving data or information formed by other nodes toward the network. A channel that connects people or things is known as a network. It sends the data from one place to another. It is the basic concept of a computer, network, and data communications.

Question

**6.3B-4. Multiple Access Protocols (4).**

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.

![Diagram of message arrivals at multiple access nodes](diagrams.png)

- The diagram shows a timeline starting from \( t=0.0 \) to \( t=5.0 \).
- Each node is represented with a red circle containing a number indicating the order of message arrivals. There are six total nodes/messages plotted across the timeline.
- Nodes/messages are marked at specific times:
1. Node 1 at \( t=0.1 \)
2. Node 2 at \( t=0.8 \)
3. Node 3 at \( t=1.35 \)
4. Node 4 at \( t=2.6 \)
5. Node 5 at \( t=3.9 \)
6. Node 6 at \( t=4.2 \)

Again consider the **CSMA protocol (without collision detection)**, and indicate those packets where the channel is sensed busy and therefore, under CSMA, *that message transmission is not attempted*.

[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, that node will not attempt a retransmission of that packet until sometime after \( t=5 \). Hint: consider propagation times carefully here].

- 1 ☐
- 2 ☐
- 3 ☐
- 4 ☐
- 5 ☐
- 6 ☐

This setup requires the analysis of CSMA timing and careful consideration of when each node senses the channel as busy due to the propagation delay.

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