3Com CoreBuilder 3500, Руководство по внедрению, Страница: 454 / 592

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AppleTalk Network
Elements
An AppleTalk network consists of different nodes and groups of
networks. Nodes can include workstations, routers, printers, and servers
that provide services for other computers, called
clients .
This section describes the elements of an AppleTalk network:
■
AppleTalk Networks
■
AppleTalk Nodes
■
Named Entities
■
AppleTalk Zones
■
Seed Routers
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
® 3500 system does
not translate Phase 1 packets to Phase 2 packets, it does route packets to
a Phase 1 network. The 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.