1.3.2a modelos de referencia
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1.3.2a modelos de referencia

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Los Modeos de Referencia de arquitecturas de red OSI y TCP/IP

Los Modeos de Referencia de arquitecturas de red OSI y TCP/IP

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  • 1. Conceptos PreviosWilliam StallingsData and Computer Communications
  • 2. OSI - The ModelA layer modelEach layer performs a subset of the required communication functionsEach layer relies on the next lower layer to perform more primitive functionsEach layer provides services to the next higher layerChanges in one layer should not require changes in other layers
  • 3. The OSI Environment
  • 4. OSI as Framework forStandardization
  • 5. Layer Specific Standards
  • 6. Elements of StandardizationProtocol specification Operates between the same layer on two systems May involve different operating system Protocol specification must be precise Format of data units Semantics of all fields allowable sequence of PCUsService definition Functional description of what is providedAddressing Referenced by SAPs
  • 7. OSI Layers (1)Physical Physical interface between devices Mechanical Electrical Functional ProceduralData Link Means of activating, maintaining and deactivating a reliable link Error detection and control Higher layers may assume error free transmission
  • 8. OSI Layers (2)Network Transport of information Higher layers do not need to know about underlying technology Not needed on direct linksTransport Exchange of data between end systems Error free In sequence No losses No duplicates Quality of service
  • 9. OSI Layers (3)Session Control of dialogues between applications Dialogue discipline Grouping RecoveryPresentation Data formats and coding Data compression EncryptionApplication Means for applications to access OSI environment
  • 10. Use of a Relay
  • 11. TCP/IP Protocol SuiteDominant commercial protocol architectureSpecified and extensively used before OSIDeveloped by research funded US Department of DefenseUsed by the Internet
  • 12. TCP/IP Protocol Architecture(1)Application Layer Communication between processes or applicationsEnd to end or transport layer (TCP/UDP/…) End to end transfer of data May include reliability mechanism (TCP) Hides detail of underlying networkInternet Layer (IP) Routing of data
  • 13. TCP/IP Protocol Architecture(2)Network Layer Logical interface between end system and networkPhysical Layer Transmission medium Signal rate and encoding
  • 14. PDUs in TCP/IP
  • 15. Some Protocols in TCP/IP Suite