ISA-IEC-62443 Exam Dumps | Why is OPC Classic considered firewall unfriendly?

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ISA/IEC 62443 Cybersecurity Fundamentals Specialist
ISA.ISA-IEC-62443.v2026-04-16.q103
Question 76

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Question 76/103

Why is OPC Classic considered firewall unfriendly?

A. It allows use of only port 80.

B. It dynamically assigns several ports.

C. It is an obsolete communication standard.

D. It works with control devices from different manufacturers.

Correct Answer: B

OPC Classic uses Microsoft's DCOM (Distributed Component Object Model) for communication, which dynamically opens multiple ports, making it extremely difficult to manage with firewalls.
"OPC Classic is firewall-unfriendly because DCOM requires dynamic port negotiation, making it difficult to define consistent firewall rules."
- ISA/IEC 62443-3-3:2013, Annex A - Communication Protocols and Security Concerns This lack of port predictability presents a significant security and operational risk, which led to the development of OPC UA, which uses fixed ports and supports encryption.
References:
ISA/IEC 62443-3-3 - Annex A
OPC Foundation Security Guidelines

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