A Defense-in-depth approach should use mixed deployment systems with some or all of the following tools:
· Scanning at the control system firewall
· Ingress/inbound and egress/outbound traffic
· Application whitelisting (AWL)
· Automatic updating for non-critical systems
· Systems with vendor approved update schemes
· Manual scheduled updates for more difficult systems
IC32M page 395
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7 months, 1 week ago