hrough its numerous acquired subsidiaries, such as OpenDNS, Webex, Jabber and Jasper, Cisco specializes in specific tech markets, such as the Internet of Things (IoT), domain security and energy management.

In 2020, Fortune magazine ranked Cisco at number four on their annual list of the 100 Best Companies to Work For in 2020 based on an employee survey of satisfaction.

Cisco Systems was founded in December 1984 by Leonard Bosack and Sandy Lerner, two Stanford University computer scientists who had been instrumental in connecting computers at Stanford. They pioneered the concept of a local area network (LAN) being used to connect geographically disparate computers over a multiprotocol router system.

Cisco's initial product has roots in Stanford University's campus technology. In the early 1980s students and staff at Stanford, including Bosack, used technology on the campus to link all of the school's computer systems to talk to one another, creating a box that functioned as a multiprotocol router called the "Blue Box". The Blue Box used software that was originally written at Stanford by research engineer William Yeager. Due to the underlying architecture, and its ability to scale well, Yeager's well-designed invention became a key to Cisco's early success.

The name "Cisco" was derived from the city name San Francisco, which is why the company's engineers insisted on using the lower case "cisco" in its early years. The logo is intended to depict the two towers of the Golden Gate Bridge.

According to en.wikipedia.org