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| Slide 13
Security Zones
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Different zones for different security levels
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All resources in the same zone must have the same
minimum security level (trust level)
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Access between zones only through secure conduits
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Provides perimeter protection of critical system assets
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Basic principle in the ISA 99/IEC 62443 series of standards
Corporate network
Available to all employees
Site intranet
Available to local employees
Control system
Available to operators and
process and control engineers