The operating system was based on a Unix-based system and was designed as a monolithic operating system, meaning that processes are stacked and interrelated. The first version of IOS that I touched was 8.2(7). After this came the Mid-Range Gateway Server (MGS), the Compact Gateway Server (CGS) and later the Integrated Gateway Server (IGS) and AGS+. The first Cisco router that I touched was an Advanced Gateway Server (AGS), which was the first marketed product of the company. In 1984, Len and Sandy Bosack from Stanford University founded Cisco Systems with a small commercial gateway server. Cisco Internetwork Operating System (IOS) has been around since a little after the inception of Cisco Systems as a company.
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