Exam 300-430 topic 1 question 203 discussion

For legacy clients to successfully associate and authenticate using IEEE 802.1X on a WLAN, the client and the authenticator (the Wireless LAN Controller or WLC) must support the same authentication protocol. This ensures that the authentication process can be completed without compatibility issues. Key Points: Authenticator: In a wireless network, the authenticator is typically the WLC or the access point (AP) that handles the 802.1X authentication process. Authentication Protocol: Common protocols include EAP-TLS, PEAP, EAP-FAST, and others. The client and the authenticator must agree on a supported protocol for authentication to succeed. Legacy Clients: Older devices may only support specific authentication protocols (e.g., PEAP or EAP-MD5), so the authenticator must also support these protocols to accommodate them.

The client and the authentication server must support the same authentication protocol. This is because the authentication server is responsible for verifying the client’s credentials during the authentication process. Therefore, it is essential that both the client and the authentication server support the same authentication protocol to ensure successful authentication.

Spoto answer D

Minsait is right

in this case the controller is the authenticator, so if B is correct the C is also correct which does not make sense

I think is D. EAP method is only defined on the client (supplicant) and RADIUS Server (Authentication Server). Not on the WLC/AP (Authenticator) from https://community.cisco.com/t5/wireless-mobility-knowledge-base/802-1x-eap-troubleshooting/ta-p/3155512

Provided answer is correct. C. is also sometimes correct if the controller is the authenticator in a given situation but B. is the best answer.