NetBIOS Datagram Service uses which port number?

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Prepare for the CPSA Port Numbers exam with multiple choice questions and detailed explanations. Understand key protocols and services to excel in your test.

Multiple Choice

NetBIOS Datagram Service uses which port number?

Explanation:
NetBIOS over TCP/IP splits its services into ports, with Datagram Service being the UDP-based, connectionless part that carries NetBIOS messages. Because it uses UDP, not TCP, it maps to port 138. The other NetBIOS services use different ports: Name Service on 137 UDP and Session Service on 139 TCP. The remaining option, 554, is for RTSP and not part of NetBIOS. Therefore, the Datagram Service uses port 138.

NetBIOS over TCP/IP splits its services into ports, with Datagram Service being the UDP-based, connectionless part that carries NetBIOS messages. Because it uses UDP, not TCP, it maps to port 138. The other NetBIOS services use different ports: Name Service on 137 UDP and Session Service on 139 TCP. The remaining option, 554, is for RTSP and not part of NetBIOS. Therefore, the Datagram Service uses port 138.

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