Transport Layer:
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RTMP - Routing Table Maintenance Protocol, maintains and broadcasts routing information (every few seconds)
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AEP - AppleTalk Echo Protocol, sends datagrams to other nodes in the network to determine their existence
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ATP - AppleTalk Transaction Protocol, determines whether requests are lost or delayed
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NBP - Name Binding Protocol, translates device a name into AppleTalk address
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Session Layer:
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ADSP - AppleTalk Data Stream Protocol, works with ATP to ensure reliable data transmission; includes flow control
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ZIP - Zone Information Protocol, maps network numbers to network zones; the information is kept in ZIT=Zone Information Table
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ASP - AppleTalk Session Protocol, responsible for opening and closing sessions
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PAP - Printer Access Protocol, maintains print service
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Presentation and Application Layers:
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AFP - AppleTalk Filing Protocol
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PostScript - paged description language
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AppleShare is a centralized file-sharing system that runs on top of AppleTalk on a Macintosh system; AppleShare servers are accessed by AppleShare clients
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