Admission control is a fundamental cybersecurity mechanism that regulates which devices and users are permitted to connect to or access network resources and services. Before granting any access, this proactive security system verifies the identity of the requesting entity through authentication and confirms its authorized permissions, ensuring adherence to predefined security policies. Its primary objective is to prevent unauthorized access, enforce compliance with organizational security postures, and mitigate potential threats by ensuring only trusted and compliant endpoints interact with the network environment.

By performing pre-admission checks on device health, user roles, and network segment requirements, admission control maintains the integrity, confidentiality, and availability of critical network assets and sensitive data. This strategic security layer significantly reduces the attack surface, strengthens overall security posture, and is indispensable for safeguarding complex digital ecosystems against a wide array of internal and external vulnerabilities and malicious activities.