Some newer Catalyst switch models (with recent versions of the Cisco IOS) also allow web-based management using a graphical interface (GUI) module which is hosted on a HTTP server located on the switch. Native IOS can also be found with newer software versions that have eliminated CatOS entirely in favor of IOS, even on hardware that originally required CatOS. In some cases, particularly in the modular chassis switches, a configuration called 'Hybrid' has emerged - this is where the layer 2 functions are configured using CatOS, and the layer 3 elements are configured using IOS. However, this has changed as the product lines have merged closer together. The Catalyst switches originally ran software called CatOS rather than the more widely known Cisco IOS software used by routers. In most cases, the technology for the Catalyst Switch was developed separately from Cisco's router technology.
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