ISA-IEC-62443 Exam Dumps | In terms of availability requirements, how do IACS and IT differ?

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ISA/IEC 62443 Cybersecurity Fundamentals Specialist
ISA.ISA-IEC-62443.v2026-04-16.q103
Question 30

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Question 30/103

In terms of availability requirements, how do IACS and IT differ?

A. IACS tolerates occasional failures while IT does not.

B. Rebooting is never acceptable in IT but tolerated in IACS.

C. Both IACS and IT have the same availability requirements.

D. Continuous operation is expected in IT while scheduled operation is sufficient for IACS.

Correct Answer: D

The ISA/IEC 62443 standards explain that continuous operation is often required in IT systems (such as data centers and online services), but for IACS environments, scheduled operation (for example, planned maintenance windows) is typically sufficient. IACS systems may accept limited downtime for maintenance, but require high availability during production runs.
Reference: ISA/IEC 62443-1-1:2007, Section 4.4.4 ("Availability in IACS and IT contexts"); Table 7 (Comparison of IT and IACS requirements).

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