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Question

Difficulty: MediumNetworking Ports and Protocols

A network administrator is organizing network documentation for firewall port configurations and remote system management tools. Match each networking protocol on the left with its standard default port number and transport protocol on the right.

  • Service Location Protocol (SLP)TCP/UDP 427
  • Apple Filing Protocol (AFP)TCP 548
  • Lightweight Directory Access Protocol (LDAP)TCP 389
  • Simple Network Management Protocol (SNMP)UDP 161

Answer

Service Location Protocol (SLP) pairs with TCP/UDP 427, Apple Filing Protocol (AFP) pairs with TCP 548, Lightweight Directory Access Protocol (LDAP) pairs with TCP 389, and Simple Network Management Protocol (SNMP) pairs with UDP 161.
Each protocol correctly matches its standard assigned port and transport protocol: Service Location Protocol (SLP) uses TCP/UDP 427, Apple Filing Protocol (AFP) uses TCP 548, Lightweight Directory Access Protocol (LDAP) uses TCP 389, and Simple Network Management Protocol (SNMP) uses UDP 161.

Step-by-Step Solution

1
Identify the primary service function of each listed protocol.
SLP performs LAN service discovery, AFP supports Apple file transfers, LDAP handles directory service authentication and queries, and SNMP manages network device telemetry.
Understanding the protocol function helps distinguish between file transfer, directory lookup, management, and service discovery categories.
2
Associate each protocol with its assigned well-known or registered port number and transport layer behavior.
SLP uses TCP/UDP port 427; AFP uses TCP port 548; unencrypted LDAP operates over TCP port 389; SNMP agent queries operate over UDP port 161.
CompTIA A+ Core 1 requires memorization of standardized default port numbers to properly configure network firewalls and diagnose service connectivity issues.

Key Concept

Standard Networking Port Assignments for Infrastructure Services
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Topics

Networking Ports and Protocols

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