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Industrial control systems have evolved significantly over the past several years with an increase in the use of Ethernet data communications networks and IP communications protocol. For example, process control systems now commonly connect historian servers to Ethernet networks to allow users IP-based access to real-time data from the Distributed Control Systems (DCS) and the Programmable Logic Controllers (PLC). More and more critical infrastructure processes are being supported with underlying standards-based network communications technology. While the use of the standards-based Ethernet network has greatly increased the business and process interaction in industrial automation environments, there is also potential for increased security risks to critical infrastructure.
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