ISA-IEC-62443 Exam Dumps | How can defense in depth be achieved via security zones?

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ISA.ISA-IEC-62443.v2026-04-16.q103
Question 69

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Question 69/103

How can defense in depth be achieved via security zones?

A. By having zones within zones, or subzones, that provide layered security

B. By having a zone edge that is using the security policies of the asset owner

C. By having zones that are connected via using the latest version of SSL

D. By having zones that separate sensors from actuators, that provide layered security

Correct Answer: A

Defense in depth is a core concept of ISA/IEC 62443, and security zones are a structural method to implement it. According to ISA/IEC 62443-3-2 and 62443-1-1, layering can be achieved by nesting zones - creating zones within zones (i.e., subzones) - to enhance protection through multiple barriers.
"Defense in depth is realized through segmentation into zones and conduits. A zone may contain subzones to establish additional layers of security, providing multiple barriers to intrusion."
- ISA/IEC 62443-3-2:2020, Clause 5.3.2 - Zone and Conduit Model
This layered zoning approach enables tiered security controls, reducing the impact of breaches and limiting lateral movement within a network.
References:
ISA/IEC 62443-3-2:2020 - Clause 5.3.2
ISA/IEC 62443-1-1:2007 - Security Zones and Conduits

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