Which method is used on a Cisco IOS router to redirect traffic to the Cisco Secure Web Appliance for URL inspection?

Web Cache Communication Protocol (WCCP) is a Cisco-developed protocol that allows Cisco IOS routers to transparently redirect traffic, such as HTTP or HTTPS, to a group of web caches or content engines, like the Cisco Secure Web Appliance, for services like URL filtering and inspection.

Route maps are used to control routing updates and apply policies to traffic based on matching criteria, but they do not inherently support transparent redirection of web traffic to a service appliance for inspection in the manner WCCP does.

A PAC (Proxy Auto-Config) file is used by client browsers to determine which proxy server to use for a given URL, requiring client-side configuration and not transparent router-based redirection.

WPAD (Web Proxy Auto-Discovery Protocol) is a mechanism for web browsers to automatically discover PAC files or proxy server settings, similar to PAC files, and relies on client-side discovery rather than router-based traffic redirection.