The first generation of ICS/SCADA systems is considered monolithic, primarily characterized by standalone systems that had no external communications or connectivity with other systems. These systems were typically fully self-contained, with all components hard-wired together, and operations were managed without any networked interaction.References:
U.S. Department of Homeland Security, "Recommended Practice: Improving Industrial Control System Cybersecurity with Defense-in-Depth Strategies".
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