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NetBIOS Frames or NBF protocol is a non-routable network- and transport-level data protocol most commonly used as one of the layers of Microsoft Windows networking in the 1990s. NBF protocol or NetBIOS over IEEE 802.2 LLC is used by a number of network operating systems released in the 1990s, such as LAN Manager, LAN Server, Windows for Workgroups, Windows 95 and Windows NT. Other protocols, such as NBT (NetBIOS over TCP/IP), and NetBIOS-over-IPX/SPX also implement the NetBIOS/NetBEUI services over other protocol suites. The NBF protocol is broadly, but incorrectly, referred to as ''NetBEUI''. This originates from the confusion with NetBIOS Extended User Interface, an extension to the NetBIOS API that was originally developed in conjunction with the NBF protocol; both the protocol and the ''NetBEUI'' emulator were originally developed to allow NetBIOS programs to run over IBM's new token ring network. Microsoft caused this confusion by labelling its NBF protocol implementation ''NetBEUI''. NBF is a protocol and the original NetBEUI was a NetBIOS application programming interface extension. ==Overview== NBF protocol uses 802.2 type 1 mode to provide the NetBIOS/NetBEUI name service and datagram service, and 802.2 type 2 mode to provide the NetBIOS/NetBEUI session service (virtual circuit). NBF protocol makes wide use of broadcast messages, which accounts for its reputation as a chatty interface. While the protocol consumes few network resources in a very small network, broadcasts begin to adversely impact performance and speed when the number of hosts present in a network grows. Sytek developed NetBIOS for IBM for the PC-Network program and was used by Microsoft for MS-NET in 1985. In 1987, Microsoft and Novell utilized it for their network operating systems LAN Manager and NetWare. Because NBF protocol is unroutable it can only be used to communicate with devices in the same broadcast domain, but being bridgeable it can also be used to communicate with network segments connected to each other via bridges. This means that NBF is only well-suited for small to medium-sized networks, where it has such an advantage over TCP/IP that requires little configuration. The NetBIOS/NetBEUI services must be implemented atop other protocols, such as IPX and TCP/IP (see above) in order to be of use in an internetwork. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「NetBIOS Frames protocol」の詳細全文を読む スポンサード リンク
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