Basic HTML version of Foils prepared Dec. 6 98

Foil 34 XNS - Xerox Network Systems (2)

From Introduction to Network Protocols Lectures at Xi'an Jaotong University -- Sept 1998. by Roman Markowski
Layer 1 (Network layer) called IDP (Internet Datagram Protocol)
  • IDP packet - variable size, 30 - 576 bytes
  • address: 32 bits (network number) + 48 bits (host number)
  • encapsulation: Ethernet II, Token Ring (3 types)
  • support: unicast, multicast, broadcast; routing: RIP
Layer 2 (Transport layer)
  • SPP - Sequenced-Packet Protocol (reliable, connection based, flow-controlled; similar to TCP and TP4 (OSI)); packet no longer than 576 bytes
  • PEP - Packet Exchange Protocol; functionally similar to UDP
  • EP - Error Protocol: notifies client about network errors
Upper layer protocols
  • Printing Protocols; Filing Protocols
  • Clearinghouse Protocol (name service)
  • Courier Protocol - process interaction and data structuring

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