CompTIA CASP+ (CAS-004) — Question 35

An energy company is required to report the average pressure of natural gas used over the past quarter. A PLC sends data to a historian server that creates the required reports.
Which of the following historian server locations will allow the business to get the required reports in an ׀׀¢ and IT environment?

Answer options

• A. In the ׀׀¢ environment, use a VPN from the IT environment into the ׀׀¢ environment.
• B. In the ׀׀¢ environment, allow IT traffic into the ׀׀¢ environment.
• C. In the IT environment, allow PLCs to send data from the ׀׀¢ environment to the IT environment.
• D. Use a screened subnet between the ׀׀¢ and IT environments.

Correct answer: D

Explanation

The correct answer is D because a screened subnet provides a secure way to separate the OT and IT environments while allowing necessary communication. Option A is incorrect as a VPN may not provide the required security level for OT data. Option B is unsuitable since allowing unrestricted IT traffic into the OT environment can pose security risks. Option C is wrong because sending data from OT to IT directly can compromise the integrity of the OT environment.