BAS/OT cybersecurity fundamentals: network segmentation between IT and OT, securing BACnet/IP and legacy protocols that have no native authentication, remote access security, patch management for embedded controllers, incident response, and NIST/ISA-IEC 62443 at an awareness level.
A modern BAS is, functionally, a distributed industrial control system — the same operational technology (OT) category as a SCADA system, where availability comes first, ahead of confidentiality, because a controller that stops responding can leave a chiller plant unable to make chilled water. This module explains why that priority inversion changes how a BAS gets patched and secured compared to ordinary IT equipment, why BACnet/IP's lack of native authentication pushes nearly the entire security burden onto network segmentation, and what a hardened remote-access practice for controls contractors and vendors actually looks like.
By the end of this module you should be able to explain why a suspected BAS compromise cannot be handled with the same immediate-isolation instinct as an IT incident, and speak credibly about NIST CSF and ISA/IEC 62443 with an owner's IT security team — the same IT/OT coordination Module 1 introduced as an increasingly essential stakeholder relationship on smart building projects.