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 defines three transport services, each on its own port. The session service is the one that establishes and maintains a connection between NetBIOS applications, and it runs over TCP port 139. The name service uses UDP port 137, and the datagram service uses UDP port 138. Port 119 is for NNTP, not NetBIOS. So for the NetBIOS Session Service, the correct port is 139. Modern systems may use SMB over port 445 without NetBIOS, but the NetBIOS session service specifically uses 139.

NetBIOS over TCP/IP defines three transport services, each on its own port. The session service is the one that establishes and maintains a connection between NetBIOS applications, and it runs over TCP port 139. The name service uses UDP port 137, and the datagram service uses UDP port 138. Port 119 is for NNTP, not NetBIOS. So for the NetBIOS Session Service, the correct port is 139. Modern systems may use SMB over port 445 without NetBIOS, but the NetBIOS session service specifically uses 139.

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