Computer network modeling tools - Computing systems...

Computer network modeling tools

There are special software-oriented software systems in which the process of creating a model is simplified. Such software systems generate the network model on the basis of initial data on its topology, the protocols used, the intensity of the request flows between the network computers, the length of the communication lines, the types of equipment and applications used. Software modeling systems can be highly specialized and sufficiently versatile, allowing to simulate networks of various types. The quality of the results of modeling largely depends on the accuracy of the initial data on the network transferred to the simulation system.

Software network modeling systems are a tool that can be useful to any administrator of a corporate network, especially when designing a new network or making drastic changes to an existing one. Products in this category allow you to check the consequences of implementing certain solutions before you purchase the equipment. Of course, most of these software packages are quite expensive, but the possible savings can also be quite appreciable.

The network simulation programs use information about the spatial location of the network, the number of nodes, the communication configuration, the data rates, the protocols used and the type of equipment, and the applications running on the network. Usually, the simulation model is not built from scratch. There are ready-made simulation models of the main network elements: the most common types of routers, communication channels, access methods, protocols, etc. These models of individual network elements are created based on various data: test results of real devices, analysis of their operation principles, analytical relationships. As a result, a library of typical network elements will be created, which can be configured using predefined parameters in the models. Simulation systems usually include a set of tools for preparing the initial data about the network under investigation - these are the means of preliminary processing of data on the network topology and measured traffic. These tools can be useful if the simulated network is a variant of an existing network and it is possible to carry out measurements of the schedule and other parameters necessary for modeling in it. In addition, the system is provided with tools for statistical processing of the obtained modeling results [6].

In Table. 4.1 shows a list of several popular simulation systems of various classes - from simple programs designed for installation on a personal computer to powerful systems that include libraries of the majority of available communication devices on the market and allow to greatly automate the study of the network under study, as well as some of their parameters cost, network type).

Table 4.1

Comparative characteristics of simulation systems

Company and Product

Cost (USD)

Network type

American HYTech, Prophesy

1495

LAN *

CACI Product, COMNET 111

34500 ... 39500

LS, GS **

Opnct, Modeler

20000

LSGS

Make System, NelMaker XA

40000 ... 70000

LAN, HS

Scientific and Engineering Software, SES/Slralegizer

9995

LANs

System & amp; Networks, BONES

20000 ... 40000

лс, гс

Rockwell (System Modeling), ARENA

2000 ... 40000

лс, гс

Note: * LAN - local network, ** HS - global network.

We give more detailed characteristics of several popular simulation systems of various classes - from simple programs intended for installation on a personal computer to powerful systems that include libraries of the majority of available communication devices on the market and allow to substantially automate the study of the network under study.

thematic pictures

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