Complete Protocol dictionary, glossary and reference
NetBIOS Datagram Service
The NetBIOS Datagram Service is one of two ways by which applications may communicate with each other, the alternative being the NetBIOS Session service. The NetBIOS Datagram Service provides connectionless and broadcast-oriented communications, making use of the UDP transport-layer protocol, port number 138. The Datagram service, because it uses UDP, is faster and more efficient but does not provide guaranteed delivery of packets.