Information Technology Reference
In-Depth Information
Figure9-1
AppleTalk and the OSI Reference Model
OSI
reference
model
AppleTalk protocols
7
Application
AppleTalk
Filing
Protocol
(AFP)
PostScript
6
Presentation
AppleTalk Data
Stream Protocol
(ADSP)
Zone Information
Protocol
(ZIP)
AppleTalk
Session Protocol
(ASP)
Printer Access
Protocol
(PAP)
5
Session
Routing Table
Maintenance
Protocol (RTMP)
AppleTalk
Update-Based
Routing Protocol
(AURP)
AppleTalk
Echo Protocol
(AEP)
AppleTalk
Transmission
Protocol (ATP)
Name Binding
Protocol (NBP)
4
Transport
Datagram Delivery Protocol (DDP)
3
Network
Address Resolution Protocol (ARP)
EtherTalk Link
Access Protocol
(ELAP)
LocalTalk Link
Access Protocol
(LLAP)
TokenTalk Link
Access Protocol
(TLAP)
FDDITalk Link
Access Protocol
(FLAP)
2
Data link
Ethernet
hardware
LocalTalk
hardware
TokenTalk
hardware
FDDI
hardware
1
Physical
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
