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Question 378 - CAS-004 discussion

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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.
Answers
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.
Answers
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.
Answers
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.
Answers
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.
Suggested answer: C

Explanation:

The best approach to reduce the company's risk is to segregate the enterprise IT servers and supervisory industrial systems. Creating a new network segment and using a Next-Generation Firewall (NGFW) to enforce a strict segmentation policy will help to isolate the systems and protect against potential attacks. Additionally, implementing a Wireless Intrusion Detection System (WIDS) can help monitor the spectrum for unauthorized devices or interference.

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asked 02/10/2024
Tracy Nicholas
33 questions
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