What is the default port used by RADIUS for authentication in Cisco ISE?

The default port used by RADIUS for authentication in Cisco Identity Services Engine (ISE) is 1812. This is an important detail to know for configuring network devices and services that rely on RADIUS for authentication processes.

RADIUS (Remote Authentication Dial-In User Service) is widely used for enabling centralized Authentication, Authorization, and Accounting (AAA) for users who connect and use a network service. The protocol has designated ports for its different functions: port 1812 is specifically assigned for authentication requests, while port 1813 is used for accounting.

Understanding this default port is crucial when setting up ISE, as it allows for seamless integration with various network devices and ensures that authentication requests are properly received and processed by the ISE server. Using the correct port ensures compatibility and security in communication between network devices and the ISE system.