What is network simulation?

In communication and computer network research, network simulation is a technique whereby a software program models the behavior of a network by calculating the interaction between the different network entities (routers, switches, nodes, access points, links etc.). Most simulators use discrete event simulation - the modeling of systems in which state variables change at discrete points in time.

There are both free/open-source and proprietary network simulators available. Examples of notable network simulators / emulators include:

• (open source)
• OPNET (proprietary software)
• NetSim (proprietary software)

Both commercial tools are available at deeply discounted prices to universities.