I. Introduction
Recently, with the spread of IoT (Internet of Things), the Internet is increasingly becoming a medium to connect all computer devices and electronic devices. The IoT brings electronic products, software and sensors closer to the real world of cyberspace. According to the Korea Institute of Industrial Economics and Trade (KIET), the world market for IoT is expected to increase from 200 billion today to 1.2 trillion by 2020. This growth of IoT also leads to an increase in the router market. This trend could create a complex network environment.