Which of the following EAP protocols carries a text challenge from the authentication server and provides server authentication in a wireless network?

A.
EAP-TLS

B.
EAP-GTC

C.
EAP-SIM

D.
EAP-AKA

Explanation:
EAP Generic Token Card, or EAP-GTC, is an EAP method created by Cisco as an alternative to PEAPv0/EAP-MSCHAPv2. EAP-GTC carries a text challenge from the authentication server and provides server authentication in the wireless network. Answer option C is incorrect. Extensible Authentication Protocol Method for GSM Subscriber Identity Module, or EAP-SIM, is an Extensible Authentication Protocol (EAP) mechanism for authentication
and session key distribution using the Global System for Mobile Communications (GSM) Subscriber Identity Module (SIM).GSM cellular networks use a subscriber identity module (SIM) card to carry out user authentication. EAP-SIM uses a SIM authentication algorithm between the client and an Authentication, Authorization, and Accounting (AAA) server providing mutual authentication between the client and the network. Answer option D is incorrect. Extensible Authentication Protocol Method for UMTS Authentication and Key Agreement, or EAP-AKA, is an Extensible Authentication Protocol (EAP) mechanism for authentication and session key distribution using the Universal Mobile Telecommunications System (UMTS) Subscriber Identity Module (USIM). Answer option A is incorrect. EAP-Transport Layer Security (EAP-TLS) is an IETF open standard and is well-supported among wireless vendors. The security of the TLS protocol is strong, provided the user understands potential warnings about false credentials. It uses PKI to secure communication to a RADIUS authentication server or another type of authentication server.