ISA/IEC 62443 Cybersecurity Fundamentals Specialist — Question 5

Which characteristic is MOST closely associated with the deployment of a demilitarized zone (DMZ)?

Answer options

• A. Level 4 systems must use the DMZ to communicate with Level 3 and below.
• B. Level 0 can only interact with Level 1 through the firewall.
• C. Internet access through the firewall is allowed.
• D. Email is prevented, thereby mitigating the risk of phishing attempts.

Correct answer: A

Explanation

The correct answer, A, indicates that Level 4 systems utilize the DMZ for communication with lower levels, which is a fundamental purpose of a DMZ in network architecture. The other options do not accurately describe the primary function of a DMZ; B focuses on interactions between specific levels, C implies unrestricted internet access which contradicts DMZ security principles, and D discusses email restrictions, which are not inherently related to a DMZ's deployment.