The scale of network traffic is becoming larger and more
diverse in recent through the increase in various services and
applications. According to the Cisco Visual Networking Index
[1], network traffic volume is expected to increase by three
times in the next five years based on 2011, as well as reaching
1.3 zetabyte by 2016. As for the first step of efficiently
managing and controlling such drastically increasing traffic,
various studies are being conducted on classifying traffic [2, 3,
4]. In addition, the need for analyzing application-level traffic
is increasing to allow ISP (Internet Service Provider) to
guarantee QoS or establish policies such as SLA (Service Level
Agreement).