What is Cisco TAC? Cisco's Support Services Technical Assistance Center (TAC) is a global organization that provides around-the- clock, award-winning technical support services online and over the phone. What is the TAC number for Cisco? North America United States 1 866 606 1866 Canada 1 866 606 1866 (French interpreter service available upon request.)

What are Cisco firewalls? A firewall is a network security device that monitors incoming and outgoing network traffic and decides whether to allow or block specific traffic based on a defined set of security rules. Firewalls have been a first line of defense in network security for over 25 years. They establish a barrier between secured and controlled internal networks that can be trusted and untrusted outside networks, such as the Internet.