[DPI] Cisco Application Visibility and Control

DPI，可分为三部分：

https://blogs.cisco.com/enterprise/cisco-traffic-analysis-encrypted-threat-analytics

知名端口流量，非知名端口流量，加密流量。

加密浏览可参考 ETA  [knowledge][ETA] Encrypted Traffic Analytics

AVC, 思科用来识别非知名端口应用的方法。

https://www.cisco.com/c/en/us/products/routers/avc-control.html

https://www.cisco.com/c/dam/en/us/solutions/collateral/enterprise-networks/unified-wan-services/at_a_glance_c45-649117.pdf