Appletalk Session Protocol (Asp); Printer Access Protocol (Pap) - 3Com CoreBuilder 2500 User Manual

AppleTalk Protocols 8-9
ZIP creates a zone information table in each router. Each entry in the ZIT is
a tuple, or pair, that includes a network number and a network zone
name. When an NBP packet arrives at the router, the router compares the
zone name in the packet with zone names in the ZIT entries. The router
then compares the network number in the matching ZIT entry with the
network number in the RTMP table, to find the interface for routing the
packet.

AppleTalk Session Protocol (ASP)

The ASP passes commands between a workstation and a server after they
connect to each other. ASP ensures that the commands are delivered in
the same order that they were sent and returns the results of these
commands to the workstation.

Printer Access Protocol (PAP)

The PAP maintains communications between a workstation and a printer
or print service. The PAP functions include setting up and maintaining a
connection, transferring the data, and tearing down the connection on
completion of the job. Like other protocols at the session layer, PAP relies
on NBP to find the addresses of named entities. PAP also depends on ATP
for sending data.
Presentation Layer The presentation layer maintains information about files, formats, and
Protocols translations between formats. An AppleTalk intranet has two protocols at
the presentation layer: the AppleTalk Filing Protocol (AFP) and PostScript.
AFP provides remote access to files on the network. PostScript is a
graphic page description language used by many printers.