Legacy serial protocols like Modbus RTU lack built-in security. What zone design approach helps mitigate this?
A.Ignore the risk since serial is not IP-based
B.Connect serial devices directly to the Internet
C.Enclose serial devices in a dedicated zone and secure the conduit boundaries
D.Replace all serial devices immediately
Why C is correct
Isolating legacy serial devices in their own zone and implementing security at the zone boundary (e.g., serial-to-IP converters with firewalls) provides compensating security.
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Where this fits in the ISA/IEC 62443 exam
IEC 62443: Zones, Conduits & Security Levels
Zones and conduits partitioning model, security levels (SL 1-4), target vs. achieved vs. capability security levels.
This question belongs to the "Zones, Conduits & Security Levels" domain, which makes up about 20% of the ISA/IEC 62443 exam.
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