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Cisco IOS (Internetwork Operating System) is a software made by Cisco for use on various hardware devices such as networking routers and switches. A command-line interface governs a series of “trains” defined as tools for delivering Cisco software to specific platforms.
Cisco defines Cisco IOS as “the world's leading network infrastructure software,” contending that, by delivering a seamless integration of platform support and business services, this operating system is a versatile resource for diverse types of networking. Cisco also calls IOS as the most widely used software of its kind anywhere in the world.
In general, Cisco IOS represents a modern operating system for handling network hardware for a household name in advanced networking technology. Cisco IOS also features an easy syntax such as "show, copy, config and debug" commands and the use of a question mark (“?”) to access help features.