Defense in depth is the principle that no single control should be trusted to stop every attack, so multiple independent layers — network, host, application, and data-level — are stacked so that if one fails, another still stands. Zero trust extends this by rejecting the idea of a trusted internal network entirely: every request, from outside or from a machine already inside the office, must prove its identity and authorization before being granted access. Together they shift security from a single strong perimeter to continuous verification distributed throughout the system.
Analogy🏏Cricket
💪 Think of it like fitness: injuries follow a predictable chain — poor warm-up, then form breakdown, then compensation, then the actual tear — and a good physio catalogs where each patient's chain can be interrupted early, rather than only treating the tear afterward. MITRE ATT&CK is the sports-medicine literature of intrusions: a public catalog of every observed breakdown pattern, organized by the stage it serves — how attackers get in, how they escalate, how they extract. Coaches worldwide describe an athlete's risk in that shared vocabulary. This reveals ATT&CK's real value: intrusions become a sequence you can interrupt at stage two, not a disaster you discover at stage five.