CompTIA Network+ (N10-007) — Question 228

An AP is configured to authenticate clients by using their Active Directory username and password. The AP uses UDP to connect to the authentication service, which then queries Active Directory. Which of the following authentication services is being used by the AP in this scenario?

Answer options

• A. RADIUS
• B. TACACS+
• C. LDAP
• D. Kerberos

Correct answer: A

Explanation

The correct answer is RADIUS, as it operates over UDP and is commonly used for network access authentication. TACACS+ uses TCP and is not typically associated with Active Directory authentication in this context. LDAP is used for directory services but does not authenticate in the same way as RADIUS does. Kerberos is a different authentication protocol that involves ticket-granting mechanisms, which are not mentioned here.