The proliferation of spyware, malware, and botnets, as well as user participation in Web 2.0 applications such as Facebook and MySpace, are increasing the demand for multiple levels of endpoint protection. The Cisco ASA Botnet Traffic Filter complements existing content security solutions by monitoring network ports for rogue activity and by detecting infected internal endpoints and bots sending command and control traffic back to a host on the Internet. The command and control domains and hosts associated with botnets and malware distribution are accurately and reliably identified using a dynamic database managed by the Cisco Security Intelligence Operations center. An annual license enables the Botnet Traffic Filter functionality and updates to the database.