Most traditional network security strategies rely on a single, outdated premise: if someone is inside your office building—or logged into your corporate VPN—they belong there. It is the digital equivalent of trusting anyone who walks past reception simply because they happen to be holding a cup of coffee and wearing a lanyard.
We like to call this the "castle-and-moat" security model. Once someone crosses the moat, they have free rein over the kingdom. They can wander into the treasury, browse the HR files, and borrow the crown jewels for the weekend.