The Cisco Internetworking Operating System (IOS) is a sophisticated operating system optimized for internetworking.

What is IOS in CCNA?

Cisco Internetwork Operating System (IOS) is an operating system used on Cisco devices, such as routers and switches. It is a multitasking operating system that implements and controls logic and functions of a Cisco device. … To configure a Cisco device running IOS, the command-line interface (CLI) is used.

Who wrote Cisco IOS?

The Cisco IOS is a proprietary kernel that provides routing, switching, internetworking, and telecommunications features. The first IOS was written by William Yeager in 1985 and enabled networked applications.