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 [RFC2119]. Sections 1.5 and 1.9 are also normative but do not contain those terms. All other sections and examples in this specification are informative.