Editing Cisco IOS (section)

== History ==
The IOS network operating system was created from code written by [[William Yeager]] at [[Stanford University]],<ref>{{Cite web |title=Inside the Engineering Quad {{!}} Stanford University School of Engineering |url=https://engineering.stanford.edu/about/visit/inside-engineering-quad |access-date=2022-05-17 |website=Stanford University |language=en |quote=In 1984, alumnus Leonard Bosack and his, wife Sandy Lerner, left computer operations staff jobs at Stanford to found an Internet router company called Cisco, which has become the dominant company in the industry. They adapted the multi-protocol router software developed some years earlier at Stanford by William Yeager. |archive-date=2022-05-14 |archive-url=https://web.archive.org/web/20220514212957/https://engineering.stanford.edu/about/visit/inside-engineering-quad |url-status=live }}</ref><ref>{{Cite web |last=Connor |first=Deni |date=2007-07-03 |title=The top network inventors of all time |url=https://www.computerworld.com/article/2542298/the-top-network-inventors-of-all-time.html |access-date=2022-05-17 |website=Computerworld |language=en |archive-date=2022-10-18 |archive-url=https://web.archive.org/web/20221018151830/https://www.computerworld.com/article/2542298/the-top-network-inventors-of-all-time.html |url-status=live }}</ref><ref>{{Cite web |last=Dix |first=John |date=2006-03-27 |title=Router man |url=https://www.networkworld.com/article/2309917/lan-wan-router-man.html |access-date=2022-05-17 |website=Network World |language=en |archive-date=2019-03-01 |archive-url=https://web.archive.org/web/20190301151738/https://www.networkworld.com/article/2309917/lan-wan-router-man.html |url-status=live }}</ref> which was developed in the 1980s for routers with 256 kB of memory and low [[CPU]] processing power. Through modular extensions, IOS has been adapted to increasing hardware capabilities and new networking protocols.<ref name="auto">{{cite book |title=IP Routing on Cisco IOS, IOS XE, and IOS XR: An Essential Guide to Understanding and Implementing IP Routing Protocols |author1=Brad Edgeworth |author2=Aaron Foss |author3=Ramiro Garza Rios |year=2014 |publisher=Cisco Press |isbn= 9780133846768 |page=2 }}</ref> When IOS was developed, Cisco Systems' main product line were routers. The company acquired a number of young companies that focused on network switches, such as the inventor of the first Ethernet switch [[Kalpana (company)|Kalpana]], and as a result Cisco switches did not initially run IOS. Prior to IOS, the Cisco Catalyst series ran [[Cisco Catalyst|CatOS]].<ref>{{cite book |title=Network Warrior: Everything You Need to Know That Wasn't on the CCNA Exam |author= Gary A. Donahue|year=2011 |publisher=O'Reilly Media |isbn= 9781449309350 |page=10 }}</ref>