We are going to examine this process in some detail, beginning with the basic naming nomenclature. The zone is key to understanding how an NBP lookup works. A zone is an arbitrary subset of AppleTalk nodes in an internetwork. In fact, any segment in the internetwork can contain nodes belonging to any number of zones. A Macintosh user typically picks their zone via the Chooser.
Routers are instrumental in the name lookup process.
Wild card characters are also permissible. The datagram portion of the FwdReq packet is identical to the datagram portion of the BrRq packet. Once again, the datagram portion of the packet is identical to the datagram portion of the FwdReq packet and therefore that of the original BrRq packet. If the router receiving the BrRq packet is directly connected to one or more networks that include the specified zone name, then the router sends out LkUp packets on the appropriate networks. Figure 1 shows an example of a LkUp packet.