NetBIOS Session 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 Session Service uses which port number?

Explanation:
NetBIOS over TCP/IP assigns specific ports to its three services: the Name Service on UDP 137, the Datagram Service on UDP 138, and the Session Service on TCP 139. The Session Service is responsible for establishing and managing a NetBIOS session between two hosts, using TCP as the transport layer, which is why it uses port 139. The other ports correspond to different NetBIOS functions, and a port like 119 belongs to a different protocol (NNTP). So the NetBIOS Session Service uses port 139.

NetBIOS over TCP/IP assigns specific ports to its three services: the Name Service on UDP 137, the Datagram Service on UDP 138, and the Session Service on TCP 139. The Session Service is responsible for establishing and managing a NetBIOS session between two hosts, using TCP as the transport layer, which is why it uses port 139. The other ports correspond to different NetBIOS functions, and a port like 119 belongs to a different protocol (NNTP). So the NetBIOS Session Service uses port 139.

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