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==Simulations==
Most of the commercial [[Simulation|simulators]] are [[GUI]] driven, while some network simulators are [[Command-line interface|CLI]] driven. The network model/configuration describes the network (nodes, routers, switches, links) and the events (data transmissions, packet error, etc.). Output results would include network-level metrics, link metrics, device metrics etc. Further, drill down in terms of simulations [[tracing (software)|trace]] files would also be available. Trace files log every packet, every event that occurred in the simulation and is used for analysis. Most network simulators use [[discrete event simulation]], in which a list of pending "events" is stored, and those events are processed in order, with some events triggering future events—such as the event of the arrival of a packet at one node triggering the event
==Network emulation==
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