ISA/IEC 62443 Cybersecurity Fundamentals Specialist — Question 26

Which is a PRIMARY reason why network security is important in IACS environments?

Answer options

• A. PLCs are inherently unreliable.
• B. PLCs are programmed using ladder logic.
• C. PLCs use serial or Ethernet communications methods.
• D. PLCs under cyber attack can have costly and dangerous impacts.

Correct answer: D

Explanation

The correct answer is D because a cyber attack on PLCs can lead to significant financial losses and hazardous situations. Options A, B, and C provide information about PLCs but do not address the critical risks associated with their vulnerability to cyber threats.