220-1101 Question 68
Single answer389 – Lightweight Directory Access Protocol (LDAP)A technician is helping deploy a new network multifunction printer that must authenticate users against the company's directory service for scan-to-email and address book lookups. The printer's configuration page asks for a directory server port number for LDAP. The network team confirms the printer will use standard, unencrypted LDAP for testing before LDAPS is enabled later. Which port should the technician configure?
- A
110
- B
389
- C
443
- D
636
Show answer and explanation
Correct answer: B
Explanation
This question tests practical recognition of common network service ports in a real deployment scenario. LDAP commonly uses TCP/UDP port 389 for standard directory access, while LDAPS commonly uses TCP port 636 for encrypted directory communication. On the A+ Core 1 exam, technicians are expected to know common ports and apply them in scenarios involving printers, authentication, email integration, and directory services. This aligns with standard vendor and industry documentation, including Microsoft Active Directory guidance and general LDAP service conventions defined in IETF LDAP-related standards.
- A. Incorrect.
110 is incorrect. Port 110 is used for POP3, which is an email retrieval protocol. A technician might choose this because the printer is being set up for scan-to-email, but POP3 is unrelated to directory lookups and LDAP authentication.
- B. Correct.
389 is correct. Port 389 is the default port for standard LDAP traffic. In this scenario, the printer is explicitly configured to use unencrypted LDAP during testing, so 389 is the appropriate choice.
- C. Incorrect.
443 is incorrect. Port 443 is used for HTTPS web traffic. Some printers use a web interface on 443 for management, which could make this distractor seem plausible, but it is not the standard port for LDAP directory queries.
- D. Incorrect.
636 is incorrect. Port 636 is typically used for LDAPS, which is LDAP over SSL/TLS. This would be appropriate after secure LDAP is enabled, but the scenario states the device will use standard, unencrypted LDAP first.