OSI Layer 3: Routed and Routing Protocols
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F I G U R E 2 . 2 3
AppleTalk's relation to the OSI model
AppleTalk Addressing
AppleTalk uses a 24-bit address written in dotted decimal format--net-
work.node. The network portion is always 16 bits long; the node portion
is always eight bits long. Therefore, as with IPX, there's no subnetting and
no classes. There are two versions of AppleTalk--Phase 1 and Phase 2. In
Phase 1, there were certain limitations in addressing. Table 2.15 shows
these limitations.
Because you can have only one network address per segment, the
number of nodes per segment is also limited. If that isn't enough, there's also
an imposed limitation of one zone per network, which obliterates an
T A B L E 2 . 1 5
AppleTalk Phase 1 Addressing
Item
Amount
Network addresses per segment
1
Host addresses per network
127
Server addresses per network
127
Zones per network
1
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