NetBIOS Characteristic

NetBIOS offers always three services:

* Service Name: recording and resolution of the name (the search of the name is part ofthe SMB, a advanced level)
* Service Session: oriented reliable communication to the logon
* Service Datagram distribution: communication not trusted without logon

When NetBIOS was a protocol working to the level datalink (given level of connection) of the model DARES, its functions was accessible throughthe interrupt 5Ch. The messages pass you to these functions were formatta to you to second of the format of the Network Block Control.

NetBIOS and NetBEUI are only assign you to the use on the local nets. For this reason, they do not have the support for the routing and can manage a maximum of 72 nodes. The use of the transmissions is intense, especially for the operations connected to the name service.

NBT (NetBIOS on TCP/IP) uses or a more NBNS (NetBIOS Name Serveur) in order to cover the service of the names on subnet multiple (while the transmission - broadcast - is limited to an only one subnet). A NBNS is one species of dynamic DNS. The implementazione Microsoft of NBNS is called WINS. Moreover, in order to extend the virtual nets NetBIOS through multiple under-nets to IP, the standard has introduced the use of one or more serveur NBDD (NetBIOS Datagram Distribution). The implementazione of NBDD of Microsoft has not never worked.