Zero-trust controls are security measures built on the rule “never trust, always verify.” Instead of assuming a user, device, or service is safe because it is inside the network, each request must prove its identity, context, and authorization. Common controls include strong authentication, device posture checks, least-privilege access, network segmentation, and continuous logging.
This matters because modern attacks often start with stolen credentials, compromised endpoints, or abused internal services. If an attacker gets into one system, zero-trust limits lateral movement and makes it harder to reach sensitive data or control planes. In AI and high-density computing environments, these controls help protect orchestration tools, management interfaces, firmware updates, and distributed workloads. Defenders use zero trust to reduce blast radius, enforce policy per request, and make access decisions based on risk rather than location alone.