NetBIOS is a session-layer protocol and API. Of course, it is able to be routed (routable), just as RPC and NFS and TCP and UDP are also routable, as are HTTP, FTP, etc. In comparison, LLC, is a data-link-layer protocol. It is not routable without some major shenanigans. NetBEUI resides right on top of LLC and doesn't make any calls to a network layer. Also, NetBEUI does all its own reliability, etc. It doesn't rely on TCP, for example. NetBEUI handles all of the communication work relative to NetBIOS. This is different from the other implementations of NetBIOS.
NetBIOS refers to the programming interface in all implementations. In the NetBIOS/TCP environment, it also refers to the portion of the packet that carries NetBIOS commands, replies, and data. In the NetBIOS/NetBEUI environment, NetBIOS refers only to the API, and NetBEUI refers to the protocol. In the NetBIOS/IPX environment, NetBIOS refers to both the API and to the protocol. To understand the details of terminology use, it's worthwhile to examine the three different frame structures for TCP, NetBEUI, and IPX. Priscilla At 03:54 AM 4/9/02, [EMAIL PROTECTED] (John Nemeth) wrote: >On Aug 29, 7:34am, "Priscilla Oppenheimer" wrote: >} >} NetBEUI is non-routable. NetBIOS is routable. NetBIOS over TCP/IP should >} supposedly work over the Internet. For example, can't you do file sharing >} over the Internet? That uses NetBIOS and SMB of CIFS. > > If you want to be pedantic (and, on this list we should be), >discussing the routability of NetBIOS is non-sensical. NetBIOS is a >session layer protocol. It would be like discussing the routability of >TCP or UDP. By themselves, these protocols only have port numbers, >they don't have node addresses. As someone else has mentioned, you >really need to look at the underlying protocol. NetBIOS over TCP/IP >(aka NBT) is, of course, completely routable, since TCP/IP is a >routable protocol. NetBIOS over NetBEUI isn't routable as NetBEUI is a >datalink layer protocol (i.e. it has hosts addresses and doesn't have >any way of doing network addressing, so its addresses are for the local >segment only, ala Ethernet MAC addresses) and must be bridged. > >}-- End of excerpt from "Priscilla Oppenheimer" ________________________ Priscilla Oppenheimer http://www.priscilla.com Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=40942&t=40784 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
