Offer expires June 30, Browse Titles. Add to Cart. Instant access upon order completion. Free Content. More Information. Maqousi, A. Al-Bahadili Ed. IGI Global. Maqousi, Ali, and Tatiana Balikhina. Available In. DOI: Current Special Offers. No Current Special Offers. Therefore, it is vital to have an accurate and a reliable generic platform to enable network developers, managers, security mangers, researchers, and students evaluating and investigating the performance of LANs of different technologies and configurations.
One of the most widely-used and powerful general-purpose network simulators is OPNET, which is an object-oriented simulation environment. These tutorials demonstrate in step-by-step fashion, the procedures of initiating new simulation, setting up the simulation parameters, running the simulation, and viewing the results.
The first tutorial Tutorial 1 simulates a wired LAN of 10 computers and one server connected to a single switch, and the second tutorial Tutorial 2 simulates a wireless ad hoc network of 10 mobile nodes and one server. The first two attributes are common to all objects: name and model. The remaining attributes are dependant on the model. You can change the attributes by clicking on the value. The above parameters can be used to model a simple application that sends packets no responses.
Select the interarrival value and a window will pop up. You can change the mean outcome says to 0. If you do make a change, then before you continue, revert back to the original values for the remainder of the demo exponential 0.
Some of the parameters you will recognise from their names. You can click on the question mark? For our demo, you don't need to make any changes the values I have chosen are sufficient. Now we need to choose the statistics that we want to collect and run the simulation.
When we run the simulation IT Guru will simulate the applications generating traffic and subsequent communications between the two nodes. We are interested in measuring the performance of the applications, nodes and entire network. To do so, we must specify statistics that we want IT Guru to collect when the simulation runs. There are two main types of statistics that we are interested in.
Now that the statistics are chosen, we are ready to run a simulation. The default options are usually sufficient except you may need to change the duration and the seed for some scenarios.
The duration is the simulation time: for example you want to simulate two wireless LAN nodes sending packets to each other for 5 minutes. In real-time it may only take several seconds. The seed is the random seed used in the simulation.
If you change the seed a different sequence of events may occur. For example, if you repeat the simulation of one scenario using the same seed, the results should be exactly the same.
But if you change the seed, the results will most likely be slightly different, even with the same scenario. The Academic Edition has a limitation on the number of events it can simulation 50 million. If you run a simulation and a warning is produced indicating the total events exceeded the limit for Academic Edition, then you may try with a shorted simulation duration e. To start the simulation, press the Run button. IT Guru will simulate the network, showing you the progress number of events per second it is calculating.
Once the simulation is complete a summary of the messages will be listed, after which you can Close the window. You can select the statistics that you want to display on the left, and see a preview on the right.
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