The NetBIOS over TCP (NBT, or sometimes NetBT) Extensions specify the extensions to the NetBIOS over TCP (NBT) protocol, as specified in [RFC1001] and [RFC1002]. These extensions modify the syntax of allowable NetBIOS names and the behavior of timers, and add support for multihomed hosts.
Sections 1.8, 2, and 3 of this specification are normative and can contain the terms MAY, SHOULD, MUST, MUST NOT, and SHOULD NOT as defined in RFC 2119. Sections 1.5 and 1.9 are also normative but cannot contain those terms. All other sections and examples in this specification are informative.