Which statement best differentiates IT, DMZ, and OT network zones in a utility environment and explains why segmentation is essential?

Which statement best differentiates IT, DMZ, and OT network zones in a utility environment and explains why segmentation is essential?

• A. IT runs control systems; DMZ hosts business services; OT runs exposed services; segmentation is optional
• B. IT handles business systems; DMZ hosts exposed services; OT runs control systems; segmentation reduces lateral movement
• C. IT handles business systems, DMZ hosts exposed services, OT runs control systems; segmentation reduces lateral movement and improves monitoring
• D. DMZ is used for offline backups with no connectivity

Answer: (A)

In utility networks, knowing how to separate IT, DMZ, and OT and why to segment between them is about containment and visibility. IT is where business systems run—things like enterprise apps, databases, and corporate services. OT handles the control systems and industrial processes that operate the plant, equipment, and safety-critical functions. The DMZ acts as a buffer that hosts services exposed to external or less-trusted networks (such as web apps or remote access gateways) so they don’t sit directly on the sensitive IT or OT networks. Segmentation is essential because it creates boundaries that limit how far a breach can spread. If an attacker gains access to the IT side, proper segmentation helps prevent that access from automatically reaching OT systems, which could impact safety, reliability, and physical operations. It also improves monitoring and control at the points where traffic crosses boundaries, making it easier to detect unusual activity and enforce access policies. So the best statement aligns IT with business systems, DMZ with exposed services, OT with control systems, and it highlights that segmentation reduces lateral movement and enhances monitoring—key reasons for securing utility environments.

In utility networks, knowing how to separate IT, DMZ, and OT and why to segment between them is about containment and visibility. IT is where business systems run—things like enterprise apps, databases, and corporate services. OT handles the control systems and industrial processes that operate the plant, equipment, and safety-critical functions. The DMZ acts as a buffer that hosts services exposed to external or less-trusted networks (such as web apps or remote access gateways) so they don’t sit directly on the sensitive IT or OT networks.

Segmentation is essential because it creates boundaries that limit how far a breach can spread. If an attacker gains access to the IT side, proper segmentation helps prevent that access from automatically reaching OT systems, which could impact safety, reliability, and physical operations. It also improves monitoring and control at the points where traffic crosses boundaries, making it easier to detect unusual activity and enforce access policies.

So the best statement aligns IT with business systems, DMZ with exposed services, OT with control systems, and it highlights that segmentation reduces lateral movement and enhances monitoring—key reasons for securing utility environments.