Which version of NetFlow does Cisco Threat Defense utilize to obtain visibility into the network?

NBAR2 (Network-Based Application Recognition 2) is a deep packet inspection technology for application recognition, not a NetFlow version for exporting flow data.

IPFIX (IP Flow Information Export) is an industry standard for flow data export, but Cisco's specific implementation and terminology often refer to this capability as 'flexible NetFlow'.

NetFlow v8 is an older version primarily used for aggregation, which has largely been superseded by flexible NetFlow (IPFIX).

Cisco Threat Defense, including Firepower appliances, leverages flexible NetFlow to collect detailed IP traffic information. Flexible NetFlow allows customization of collected fields and is the evolution of traditional NetFlow, aligning with the IPFIX standard for interoperability.