NetBIOS is a session layer protocol. Of course it's routable. Yes, it's true that IBM invented NetBIOS.
NetBEUI was the name of IBM's software module that implemented NetBIOS. It usually ran in conjunction with TOKREUI, by the way, which was driver software for Token Ring. NetBEUI didn't make any calls to a network layer. It assumed it was running directly above LLC and made calls to LLC's interface. It also make source-route bridging calls, by the way. It's just semantics at this point but does point out a couple higher-level concepts. One, networking is more complicated than the simple statements like "NetBIOS is not routable" that you will find in Networking 101 papers. Two, it's important to understand that every layer makes calls to a layer below and every layer offers services to a layer above. Because the service interface of a layer, whether it be LLC or UDP, is well known (hopefully), any upper layer can call on it. So, an implementation of a session layer protocol such as NetBIOS can call on UDP, TCP, LLC, or IPX. That's the real message from the infamous OSI model. It's all about service interfaces. Priscilla - jvd wrote: > > Hi, > > I just want to make something clear. NetBIOS and NetBEUI were > created by IBM and later found its way to Microsoft networks > who changed it. > > - These protocols are non-routable in an IBM environment. > - NetBEUI is non-routable in TCP/IP networks. > - NetBIOS is non-routable without the help of NetBT. > > NetBT is NetBIOS over TCP/IP and was conceived in RFCs 1001 and > 1002 to enable NetBIOS to be routed. Short overview here: > http://www.microsoft.com/windows2000/techinfo/reskit/en-us/default.asp?url=/windows2000/techinfo/reskit/en-us/cnet/cnad_arc_khqp.asp > > Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=71161&t=71084 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
