1,000,000 users worldwide on Perfigo systems

https://web.archive.org/web/20041024032745/http://www.perfigo.com/company/index.html

Cisco NAC Appliance

https://en.wikipedia.org/wiki/Cisco_NAC_Appliance

NAC Appliance has reached End of Support

https://www.cisco.com/c/en/us/support/docs/field-notices/705/fn70500.html

Perfigo 2004 Website

https://web.archive.org/web/20041027033025/http://www.perfigo.com/

Cloud Services Cisco.com/Perfigo.com

https://www.ciscolive.com/c/dam/r/ciscolive/us/docs/2020/pdf/DGTL-BRKSEC-3432.pdf

Cisco's Security Investments

https://www.cisco.com/c/dam/m/hr_hr/training-events/2018/Cisco-Security-Data/pdf/security_everywhere_bremtane_moudjeb.pdf

Cisco Security Strategy

http://www.downloads.quadratodellaradio.it/Udine%202018b/12_Agostino_Santoni.pdf