Conceptos BásicosWilliam StallingsData and Computer Communications
ProtocolsUsed for communications between entities in a systemMust speak the same languageEntities  User applications  ...
Key Elements of a ProtocolSyntax  Data formats  Signal levelsSemantics  Control information  Error handlingTiming  ...
Protocol ArchitectureTask of communication broken up into modulesFor example file transfer could use three modules  Fil...
Simplified File TransferArchitecture
A Three Layer ModelNetwork Access LayerTransport LayerApplication Layer
Network Access LayerExchange of data between the computer and the networkSending computer provides address of destinatio...
Transport LayerReliable data exchangeIndependent of network being usedIndependent of application
Application LayerSupport for different user applicationse.g. e-mail, file transfer
Addressing RequirementsTwo levels of addressing requiredEach computer needs unique network addressEach application on a...
Protocol Architectures andNetworks
Protocols in SimplifiedArchitecture
Protocol Data Units (PDU)At each layer, protocols are used to communicateControl information is added to user data at ea...
Network PDUAdds network header  network address for destination computer  Facilities requests
Operation of a ProtocolArchitecture
1.3.1a software de red
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1.3.1a software de red

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Conceptos básicos sobre el Software de Red

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1.3.1a software de red

  1. 1. Conceptos BásicosWilliam StallingsData and Computer Communications
  2. 2. ProtocolsUsed for communications between entities in a systemMust speak the same languageEntities User applications e-mail facilities terminalsSystems Computer Terminal Remote sensor
  3. 3. Key Elements of a ProtocolSyntax Data formats Signal levelsSemantics Control information Error handlingTiming Speed matching Sequencing
  4. 4. Protocol ArchitectureTask of communication broken up into modulesFor example file transfer could use three modules File transfer application Communication service module Network access module
  5. 5. Simplified File TransferArchitecture
  6. 6. A Three Layer ModelNetwork Access LayerTransport LayerApplication Layer
  7. 7. Network Access LayerExchange of data between the computer and the networkSending computer provides address of destinationMay invoke levels of serviceDependent on type of network used (LAN, packet switched etc.)
  8. 8. Transport LayerReliable data exchangeIndependent of network being usedIndependent of application
  9. 9. Application LayerSupport for different user applicationse.g. e-mail, file transfer
  10. 10. Addressing RequirementsTwo levels of addressing requiredEach computer needs unique network addressEach application on a (multi-tasking) computer needs a unique address within the computer The service access point or SAP
  11. 11. Protocol Architectures andNetworks
  12. 12. Protocols in SimplifiedArchitecture
  13. 13. Protocol Data Units (PDU)At each layer, protocols are used to communicateControl information is added to user data at each layerTransport layer may fragment user dataEach fragment has a transport header added Destination SAP Sequence number Error detection codeThis gives a transport protocol data unit
  14. 14. Network PDUAdds network header network address for destination computer Facilities requests
  15. 15. Operation of a ProtocolArchitecture

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