IT and OT networks may look similar on paper — but in reality, they serve completely different goals, operate with different constraints, and require different security approaches. In this video, we break down Section 3 of my OT Cyber Security course: a clear, practical explanation of IT vs OT network architecture, the OSI model, and the Purdue Enterprise Reference Model. You will learn: * Key differences between IT networks and OT industrial networks * Why availability is king in OT environments * How Purdue Model zones (Level 0–5) map to real industrial systems * How the OSI model relates to OT communication layers * Where PLCs, HMIs, SCADA, historians, and controllers sit in the Purdue hierarchy * Why modern OT networks are evolving beyond traditional Purdue * Real-world examples of segmentation in factories and industrial plants This is a preview video from my complete OT Cyber Security course on Udemy (available in Hindi and English). If you want hands-on labs, OT attack demonstrations, governance workflows, and detailed OT security frameworks, explore the full course here: Enroll in the Full OT Cyber Security Course https://www.udemy.com/course/ot-security-ics-scada-purdue-model-mitre-ics-pentest/?referralCode=5D109105FADDEB05184C Subscribe for more videos on OT, ICS, and industrial cybersecurity. #otsecurity #ics #PurdueModel #osimodel #industrialsecurity #scada #plc #operationaltechnology #cybersecurity #networksecurity