ISA-IEC-62443 Exam Dumps | What makes patching in IACS environments particularly complex?

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ISA.ISA-IEC-62443.v2026-04-16.q103
Question 62

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Question 62/103

What makes patching in IACS environments particularly complex?

A. Cyber threats do not affect IACS systems

B. Continuous operations and safety concerns

C. Patches never require testing before deployment

D. The availability of unlimited maintenance windows

Correct Answer: B

Patching in Industrial Automation and Control Systems (IACS) is complex primarily due to:
The need to maintain continuous operations
Strict safety and reliability requirements
The risk of introducing unintended consequences through updates
"Unlike IT environments, IACS patching is constrained by the requirement to maintain availability and ensure safety. Patches must be tested in staging environments and applied during maintenance windows to avoid disrupting operations."
- ISA/IEC 62443-2-3:2015, Clause 6.1 - Patch Management Process
This makes patch management a risk-based and carefully scheduled activity, not an automatic or rapid one.
References:
ISA/IEC 62443-2-3:2015 - Clause 6.1
ISA/IEC 62443-2-1:2010 - Clause 4.3.4.3 - Change Management

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