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Cisco IOS (originally Internetwork Operating System) is a family of software used on most Cisco Systems routers and current Cisco network switches. (Earlier switches ran CatOS.) IOS is a package of routing, switching, internetworking and telecommunications functions integrated into a multitasking operating system. Although the IOS code base includes a cooperative multitasking kernel, most IOS features have been ported to other kernels such as QNX and Linux for use in Cisco products or simulators such as Cisco VIRL.
Not all Cisco products run IOS. Notable exceptions include ASA security products, which run a Linux-derived operating system, and carrier routers which run IOS-XR.

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