3Com CoreBuilder 2500 - Appletalk Networks; Appletalk Nodes; Appletalk Zones; Named Entities

8-2 CHAPTER 8: ROUTING WITH APPLETALK TECHNOLOGY
AppleTalk Networks A subnetwork in an AppleTalk intranet is a cable segment attached to a
router. Each subnetwork is identified by a network number or range of
network numbers. You assign these numbers from a range of valid
network numbers.
Two AppleTalk network numbering systems are currently in use:
nonextended (Phase 1) and extended (Phase 2). 3Com routers support
extended network numbers. While the CoreBuilder
™
2500 system does
not translate Phase 1 packets to Phase 2 packets, it does route packets to
a Phase 1 network. The CoreBuilder 2500 system anticipates that a
gateway exists between the two networks to translate the packets.
An extended intranet can span a range of logical networks. Network
numbers in an extended network consist of a range, such as network 15
through 20. This numbering scheme allows as many as 16,580,608
nodes, although the actual cables do not support this many nodes.
AppleTalk Nodes A node in a AppleTalk network is any addressable device, including a
workstation, printer, or router. Nodes are physically attached to a
network. At initialization, each node in an AppleTalk network selects a
unique AppleTalk address. The address consists of the node’s network
number and a unique node number.
Named Entities
When a device on the network provides a service for other users, you can
give the device a name. The name appears on the Chooser menu of the
Macintosh with an associated icon. For example, the Chooser of the
Macintosh can include a printer icon. When the user selects the printer
icon, several printer names can appear in a list, such as
Laser1 or Laser 2.
The Name Binding Protocol (NBP), described later in this chapter,
translates these device names into AppleTalk addresses.
AppleTalk Zones An AppleTalk zone is a logical collection of nodes on an AppleTalk
intranet. A zone can include all nodes in a single network or a collection
of nodes in different networks. You assign a unique name to each zone
to identify it in the intranet.