The following are the datagram support commands:
Datagram support provides unreliable connectionless data transfer. The message is a single data frame whose size is limited to a MAC frame minus any headers. The protocol driver ensures that the message is transmitted to the network medium. The receiver does not generate a response to the sender to indicate that the datagram was received. Therefore, unreliable connectionless data transfer requires fewer system resources than reliable connection-oriented data transfer.
The NCBDGRECV and NCBDGSEND commands transfer a datagram to a specified NetBIOS name. If the specified name is a unique name, the datagram is received by the single process that registered the name. If the specified name is a group name, the datagram is received by all processes that registered the name. This process is shown in the following illustration.
The NCBDGSENDBC command broadcasts a datagram to all computers on the network. The datagram is received by all processes that have issued the NCBDGRECVBC command, as shown in the following illustration.
