CAS-004 Exam Dumps | A security engineer is re-architecting a network environment that provides regional electric distribution

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Question 146/245

A security engineer is re-architecting a network environment that provides regional electric distribution services. During a pretransition baseline assessment, the engineer identified the following security-relevant characteristics of the environment:
* Enterprise IT servers and supervisory industrial systems share the same subnet.
* Supervisory controllers use the 750MHz band to direct a portion of fielded PLCs.
* Command and telemetry messages from industrial control systems are unencrypted and unauthenticated.
Which of the following re-architecture approaches would be best to reduce the company's risk?

A. Implement a one-way guard between enterprise IT services and mission-critical systems, obfuscate legitimate RF signals by broadcasting noise, and implement modern protocols to authenticate ICS messages.

B. Characterize safety-critical versus non-safety-critical systems, isolate safety-critical systems from other systems, and increase the directionality of RF links in the field.

C. Create a new network segment for enterprise IT servers, configure NGFW to enforce a well-defined segmentation policy, and implement a WIDS to monitor the spectrum.

D. Segment supervisory controllers from field PLCs, disconnect the entire network from the internet, and use only the 750MHz link for controlling energy distribution services.

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