CompTIA Network+ (N10-006) — Question 3

Users connecting to an SSID appear to be unable to authenticate to the captive portal.
Which of the following is the cause of this issue?

Answer options

• A. WPA2 security key
• B. SSL certificates
• C. CSMA/CA
• D. RADIUS

Correct answer: D

Explanation

The correct answer is D, as RADIUS is responsible for authenticating users in a captive portal setup. If there's an issue with the RADIUS server, users will be unable to authenticate. The other options, while related to network security and communication, do not directly impact the captive portal authentication process.