Microsoft Cybersecurity Architect (SC-100)Design a Zero Trust strategy and architectureMedium
A global manufacturing company is designing a Zero Trust architecture for its operational technology (OT) environment. The OT network contains legacy systems that cannot be easily updated or patched and require strict isolation from the enterprise IT network. The company needs to enable secure, one-way data transfer from the OT environment to the IT environment for monitoring and analytics, without allowing any direct inbound connections to OT. Which component is crucial for implementing this secure data flow?
- AData Diode (Unidirectional Gateway)
- BSecure Access Service Edge (SASE)
- CCloud Access Security Broker (CASB)
- DAzure AD B2B Collaboration
Show answer & explanationAnswer & explanation
Correct answer: A. Data Diode (Unidirectional Gateway)
A data diode, or unidirectional gateway, is a cybersecurity device that ensures data can only flow in one direction, physically preventing any inbound connections to the highly sensitive OT network while allowing outbound data for monitoring, perfectly aligning with the strict isolation requirements of a Zero Trust OT architecture.
Why the other options are wrong
- B. SASE integrates networking and security services in the cloud for remote users and branches, not for strict one-way data transfer in an OT environment.
- C. CASB is for securing SaaS applications, not OT network security.
- D. Azure AD B2B Collaboration is for external identity management, not OT network segmentation or unidirectional data transfer.
Data Diode (Unidirectional Gateway)
A data diode is a hardware-based cybersecurity solution that enforces one-way data flow, physically preventing any data from traversing a network boundary in the opposite direction.
- Provides absolute physical separation for data flow.
- Crucial for highly sensitive environments like OT/ICS.
- Enables secure outbound data transfer while blocking inbound connections.
Memory trick: The Data Diode: 'Don't Dare to Double-Dip' (only one way).