A Cisco employee in Building I shows off a secret employee perk. Business Insider Every large company has a personality. At Cisco's headquarters, the world's largest maker of network equipment, that personality can be summed up in a word: connected.

There's a sense of renewal at the 31-year-old tech giant, with its first new CEO in 20 years, Chuck Robbins.

Cisco recently invited Business Insider to its world headquarters in San Jose as part of an invitational press conference to meet the new CEO and his new administration.

During that time, we took a rare tour of Cisco's enormous campus and were shown some of the areas so secret that most of its 71,000 employees don't even know they exist.