260 Chapter 8: AppleTalk
·
AppleTalk Filing Protocol (AFP)--Implemented at the presentation and application
layers of the AppleTalk protocol suite. AFP permits workstations to share files across a
network.
·
Printer-Access Protocol (PAP)--Allows a workstation to establish connections with
print servers.
Figure 8-2 shows an AppleTalk suite of protocols.
Figure 8-2
AppleTalk Protocol Suite
AppleTalk Addressing
AppleTalk uses addresses to identify and locate devices on a network in a manner similar to
TCP/IP and IPX. A segment address must be unique. These addresses are composed of the
following:
·
Network number--A 16-bit value that identifies a specific network. This number
roughly correlates to a class B IP network. There are 64,000 network numbers available.
Network numbers in AppleTalk are also commonly called cable ranges.
Network numbers should be administered in a way that makes logical sense. A
logical numbering system aids in troubleshooting.
Networks might be allocated by:
-- Building
-- Floor
-- Department
-- Division
·
Node number--An 8-bit value that identifies a node attached to the network. The
maximum number of hosts allowed per network is 253.
·
Socket number--An 8-bit value that identifies an application.
IP network
applications
AppleTalk network
applications
Routing
Chooser
Apple Talk higher
layers
Mac TCP
supports
IP stack
ATP
ADSP
RTMP
NBP
ZIP
DDP
AARP
Physical and data link layers
87200333.book Page 260 Wednesday, August 22, 2001 2:37 PM