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Traditional approaches to network security used well-defined borders to protect inside networks from outside threats and malware. Employees used corporate computers secured with antivirus and personal firewalls. Perimeter-based networks were protected using network-scanning devices (firewalls, web proxies, and email gateways).
Today, network borders are dissolving as users want to access to resources from any locations, on any type of endpoint devices, using various connectivity methods. Cisco has addressed this with the Borderless Network Architecture, which integrates the following components:
The architectural approach to security found in the Borderless Network Architecture results in distinct categories of Cisco products, technologies, and solutions: