Ethical Hacking Essentials Practice Test

What is the purpose of an industrial demilitarized zone in the Purdue model?

1. To enhance data storage

2. To segregate OT environments from external threats

3. To manage user authentication

4. To optimize network speed

The correct answer is: To segregate OT environments from external threats

The purpose of an industrial demilitarized zone (DMZ) within the Purdue model is to effectively segregate operational technology (OT) environments from external threats. This segmentation is crucial for maintaining the security of critical industrial control systems, which are often vulnerable to attacks from outside networks. By placing a DMZ between the OT network and potentially insecure external networks, organizations can control and monitor the data flow, limiting exposure and minimizing risks. This strategic placement creates a buffer zone that allows for secure communication paths while preventing direct access to sensitive systems. It plays a vital role in defending against cyber threats, ensuring that the integrity and availability of OT operations are maintained. This concept supports the broader principle of layered security in industrial environments. While the other options may relate to network management in some manner, they do not capture the specific security-focused intent of the DMZ as it pertains to the Purdue model. Enhancing data storage and optimizing network speed address different aspects of IT infrastructure rather than security. Managing user authentication, while important, is not the primary function of a DMZ. Thus, option B accurately reflects the intended role of an industrial DMZ.