Comparing QoS Performances of Hub and Switched Ethernet LAN using OMNET++ Simulation Models

ELEC3500 Surname
Monash University
Faculty of Engineering
ELEC3500 Telecommunications Networks
Simulation experiment V: comparing the QoS performances of Hub and Switched based
Ethernet LAN using OMNET++ simulation models
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ELEC3500 Surname
Summary
This experiment evaluates the quality of service (QoS) performance of Hub and the switched
based local area networks wick varying sizes of QoS packets depending on the parameters
provided, the previous simulations are also used as reference for this simulation V. Carrier sense
multiple access with collision detection (CSMA/CD) networks are mostly used to control access
in Ethernets for local area networks (LAN). It immediately terminates the transmission of any
data or information upon detection of any collision. In this lab experiment, the performance of
bus and hub configurations based CSMA/CD networks are analyzed using OMNET++
simulation models that were developed previously [5][2]
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ELEC3500 Surname
Contents
Summary....................................................................................................................................................2
1.0 Introduction...................................................................................................................................2
2.0 Methodology.........................................................................................................................................4
2.1 Objectives.........................................................................................................................................4
2.2 Model description............................................................................................................................4
2.3 Procedure.........................................................................................................................................5
2.0 Results and discussion...................................................................................................................6
4.0 Questions..............................................................................................................................................8
5.0 Conclusion............................................................................................................................................9
6.0 References............................................................................................................................................9
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ELEC3500 Surname
1.0 Introduction
Switched based ethernet local area networks (LAN) are network cables which uses switches
while connecting to other networks or segments. the switch acts as repeater for the case of
individual network hosts. The ethernet switch allocates the device full network based on the
speed of the host [1]. The switched based networks are sometimes called desktop ethernet
networks. When segments are used, hubs are substituted to switching hubs. Switch based
networks are an improvement of traditional ethernets through which devices compete for one
common host. the switch based local area networks are currently taking the market because of
their advantages, they increase the bandwidth of the existing networks. For hub network
configuration however, several devices are connected to one central point. Some devices use a
switch or a router instead of a hub [8]. Figure 1 show hub network topology [6]. When a packet
is received it the hub, it is broadcasted to all other devices connected to the hub thus all of them
receive the package at the same time with the possibility of collision [3][4]. However, switched
based ethernets may be used to prevent occurrence of any collision.
Figure 1 Hub topology [4]
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