The described onboarding process requires mutual authentication between the endpoint and Cisco ISE using certificates. The Extensible Authentication Protocol - Transport Layer Security (EAP-TLS) protocol is the best choice because it supports:
1. Mutual Authentication:
Cisco ISE presents its identity certificate to the endpoint, which validates it.

The endpoint presents its identity certificate, signed by Cisco ISE, to the Cisco ISE server.

2. Certificate-Based Authentication:
EAP-TLS relies on X.509 certificates for both the client and server, meeting the requirements

outlined in the scenario.
3. Secure Communication:
TLS ensures that communication between the client and server is encrypted and secure.
