A systems administrator wants to implement a wireless protocol that will allow the organization to authenticate mobile devices prior to providing the user with a captive portal login. Which of the following should the systems administrator configure?
A. L2TP with MAC filtering
B. EAP-TTLS
C. WPA2-CCMP with PSK
D. RADIUS federation
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B Question says “to authenticate mobile devices prior to login “ – implies pre-authentication – EAP-TTLS pre-authenticates devices then provides logins.
https://www.tech-faq.com/eap-leap-peap-and-eap-tls-and-eap-ttls.html
Not (C) Although “portal” usually implies PSK (pre-shared-key), WPA2-CCMP with PSK (WPA2-PSK, also called WPA2 Personal) – is designed for home users without an enterprise authentication server – uses a passphrase for pre-shared key – no device pre-authentication.