HPE Aruba Certified Design Expert (ACDX) — Question 59

What is one difference between captive portal authentication and 802.1X authentication?

Answer options

• A. 802.1X authentication always authenticates the wireless client, while captive portal authentication always authenticates the wireless user.
• B. 802.1X authentication is typically implemented without encryption, while captive authentication is often combined with WPA or WPA2.
• C. 802.1X authentication occurs at Layer 2, while captive portal authentication occurs at Layer 3.
• D. 802.1X authentication must use an LDAP server, while captive portal authentication can use a RADIUS server or an LDAP server.

Correct answer: C

Explanation

The correct answer is C because 802.1X operates at Layer 2 of the OSI model, providing port-based network access control, while captive portal authentication functions at Layer 3 by redirecting users to a web page for authentication. The other options misrepresent the functions or requirements of the authentication methods involved.