312-50V9 · Question #600
What port number is used by LDAP protocol?
The correct answer is B. 389. This question tests knowledge of well-known TCP/UDP port numbers, specifically the standard port assigned to the LDAP directory service protocol.
Question
What port number is used by LDAP protocol?
Options
- A110
- B389
- C464
- D445
How the community answered
(24 responses)- A4% (1)
- B92% (22)
- D4% (1)
Why each option
This question tests knowledge of well-known TCP/UDP port numbers, specifically the standard port assigned to the LDAP directory service protocol.
Port 110 is assigned to POP3 (Post Office Protocol version 3), used for retrieving email from a mail server.
LDAP (Lightweight Directory Access Protocol) uses TCP and UDP port 389 for unencrypted directory queries and operations, as defined in RFC 4511. LDAPS (LDAP over SSL/TLS) uses port 636, but the standard LDAP port is 389, used extensively in Active Directory and other directory services for authentication and directory lookups.
Port 464 is assigned to Kerberos password change (kpasswd), not LDAP.
Port 445 is used by SMB (Server Message Block) / Microsoft-DS for file sharing and Windows networking services.
Concept tested: LDAP protocol standard port number assignment
Source: https://www.rfc-editor.org/rfc/rfc4511
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