GSLC · Question #353
Which of the following port numbers is used by the LDAP protocol when it is secured?
The correct answer is D. 636. LDAP over SSL (LDAPS) uses port 636 to provide encrypted directory service communication, distinct from standard LDAP which operates on port 389.
Question
Which of the following port numbers is used by the LDAP protocol when it is secured?
Options
- A335
- B120
- C442
- D636
How the community answered
(36 responses)- A3% (1)
- B6% (2)
- D92% (33)
Why each option
LDAP over SSL (LDAPS) uses port 636 to provide encrypted directory service communication, distinct from standard LDAP which operates on port 389.
Port 335 is not assigned to any variant of LDAP and is not a recognized standard protocol port for directory services.
Port 120 is not associated with LDAP in any form and is not a recognized standard for directory service communication.
Port 442 is not a standard LDAP port - HTTPS uses port 443, and no LDAP variant is assigned to port 442.
Port 636 is the well-known port assigned for LDAP over SSL/TLS (LDAPS), which secures directory service traffic by encrypting the connection between the client and the LDAP server. This ensures that credentials and directory data transmitted during authentication and queries cannot be intercepted in plaintext. Standard LDAP operates on port 389, while the secured variant uses 636.
Concept tested: LDAPS secure port number identification
Source: https://learn.microsoft.com/en-us/troubleshoot/windows-server/active-directory/ldap-over-ssl-connection-issues
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