When using an LDAP server as the authentication server, which of the following protocols is used for the interaction between the device and the server?

Question

Options

• ARADIUS protocol
• BHTTP protocol
• CLDAP protocol
• DEAP protocol

• A
  5% (2)
• B
  5% (2)
• C
  73% (30)
• D
  17% (7)

Explanation

LDAP (Lightweight Directory Access Protocol) is both the name of the server type and the protocol used to communicate with it - when a device queries an LDAP server for authentication, it speaks LDAP directly, making C the only correct choice.

Why the distractors are wrong:

• A (RADIUS): RADIUS is a separate AAA protocol used between a NAS (Network Access Server) and an authentication server - it's not the protocol spoken to an LDAP server itself, though RADIUS can forward queries to LDAP as a backend.
• B (HTTP): HTTP is a web transfer protocol with no role in directory-service authentication exchanges.
• D (EAP): EAP (Extensible Authentication Protocol) is a framework used at the client-to-authenticator layer (e.g., Wi-Fi 802.1X), not between a device and an LDAP directory.

Memory tip: Think of it this way - "LDAP server, LDAP protocol." The protocol always matches the service name, just like DNS servers use DNS and DHCP servers use DHCP. If the question names the server type, the matching protocol is almost always the answer.

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