System information

AppleTalk Technology Basics
Book Title
9-176
Figure 9-1 AppleTalk and the OSI Reference Model
Media Access
Apple designed AppleTalk to be link-layer independent. In other words, it can theoretically run on
top of any link-layer implementation. Apple supports a variety of link-layer implementations,
including Ethernet, Token Ring, Fiber Distributed Data Interface (FDDI), and LocalTalk. Apple
refers to AppleTalk over Ethernet as EtherTalk, to AppleTalk over Token Ring as TokenTalk, and
to AppleTalk over FDDI as FDDITalk. The link-layer protocols that support AppleTalk over these
media are EtherTalk Link Access Protocol (ELAP), LocalTalk Link Access Protocol (LLAP),
TokenTalk Link Access Protocol (TLAP), and FDDITalk Link Access Protocol (FLAP). LocalTalk
is Apple’s proprietary media-access system. It is based on contention access, bus topology, and
OSI
Reference
Model
7 Application
6 Presentation
5 Session
4 Transport
3 Network
2 Data link
1 Physical
AppleTalk Data
Stream Protocol
(ADSP)
Zone Information
Protocol
(ZIP)
AppleTalk
Session Protocol
(ASP)
Printer Access
Protocol
(PAP)
EtherTalk Link
Access Protocol
(ELAP)
LocalTalk Link
Access Protocol
(LLAP)
TokenTalk lInk
Access Protocol
(TLAP)
FDDITalk Link
Access Protocol
(FLAP)
Ethernet
hardware
LocalTalk
hardware
TokenTalk
hardware
FDDI
hardware
Routing Table
Maintenance
Protocol (RTMP)
AppleTalk
Update-Based
Routing Protocol
(AURP)
AppleTalk
Echo Protocol
(AEP)
AppleTalk protocols
Datagram Delivery Protocol (DDP)
Address Resolution Protocol (ARP)
AppleTalk
Transmission
Protocol (ATP)
Name Binding
Protocol (NBP)
AppleTalk
Filing
Protocol
(AFP)
PostScript