Cybersecurity for Industrial Control Systems (ICS) has changed dramatically in recent years. The once considered trivial, inconvenient, and overlooked cybersecurity management features have transformed into a specialized security industry, specifically designed to protect industrial systems such as power plants, water treatment facilities, and transportation systems. Without cybersecurity using managed Ethernet switches for ICS, everyday conveniences such as having fresh drinking water or getting food from the grocery store would be impossible. 
 
Historically, industrial networks have been simple standalone analog systems, with little to no outside communication beyond its meters, gauges, and control sensors. They were small, isolated, and closed-looped with many in an “air gap” style configuration (physically disconnected from the enterprise network) with very little security. 
 
Plant managers and engineers who operated these industrial networks viewed cybersecurity as a nuisance and often avoided configuring user authentication and access permission settings. As such, the ICS were left unguarded with no security measures in place to protect them from outside attackers....