The Paradigm Shift: From Castle-and-Moat to Zero Trust Edge In the rapidly evolving landscape of cybersecurity, the traditional perimeter has not just moved; it has effectively dissolved. For decades, the standard for enterprise security was the "castle-and-moat" model. This architectural philosophy assumed that anything inside the network perimeter was inherently trustworthy, while everything outside was potentially malicious. However, the explosion of the Internet of Things (IoT) and the decentralization of compute resources to the 'edge' have rendered this model obsolete. In a modern enterprise environment, the perimeter is no longer a single firewall—it is every sensor, every smart camera, and every industrial controller connected to your network. As security professionals, we are currently facing a massive visibility gap as IoT devices proliferate across critical infrastructure. Historically, Intrusion Detection Systems (IDS) like Snort and Suricata were the gold standard for monitoring network traffic.…