This lecture explores integrated security architecture and cybersecurity in intelligent buildings, covering PSIM, access control, CCTV, intrusion detection, fire alarms, and secure network design. It examines network segmentation, encryption, redundancy, Zero Trust Architecture, and penetration testing, along with key standards such as ONVIF, IEC 62443, ISO 27001, and NIST frameworks. The lecture highlights the growing convergence of physical security and cybersecurity in modern buildings.