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{{Short description|Simulating computer networks}}
{{Use American English|date = March 2019}}
{{unreferenced|date=April 2019}}
In [[computer network]] research, '''network simulation''' is a technique whereby a software program replicates the behavior of a real network. This is achieved by calculating the interactions between the different network entities such as routers, switches, nodes, access points, links, etc. Most simulators use discrete event simulation in which the modeling of systems in which state variables change at discrete points in time. The behavior of the network and the various applications and services it supports can then be observed in a test lab; various attributes of the environment can also be modified in a controlled manner to assess how the network/protocols would behave under different conditions.
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There are both free/open-source and proprietary network simulators available. Examples of notable network simulators / emulators include:
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* OPNET (Riverbed)
* NetSim (Tetcos)
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{{reflist}}
[[Category:Computer networking]]
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