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22 장. OSI 상위계층

22 장. OSI 상위계층. 22.1 세션( session) 층 22.2 표현( presentation) 층 22.3 응용( application) 층 22.4 요약. 22.1 세션층. 세션층(계속). Service to coordinate connection and disconnection of dialogs between applications to provide synchronization points for data exchange to coordinate who sends when

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22 장. OSI 상위계층

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  1. 22장.OSI 상위계층 22.1 세션(session)층 22.2 표현(presentation)층 22.3 응용(application)층 22.4 요약

  2. 22.1 세션층

  3. 세션층(계속) • Service • to coordinate connection and disconnection of dialogs between applications • to provide synchronization points for data exchange • to coordinate who sends when • to ensure that the data exchange is complete before the session closes(a graceful close)

  4. 세션층(계속) • Session and Transport Interaction • T.L is allowed to do "some" of the job; • S.L must do "all or none".

  5. 세션층(계속) • Session-to-Transport Communication

  6. 세션층(계속) • 동기점(Synchronization point)

  7. 세션층(계속) • Session Protocol Data Unit

  8. 22.2 표현(presentation)층

  9. 표현층(계속) • Translation

  10. 표현층(계속) • Encryption/Decryption

  11. 표현층(계속) • Encryption and decryption method

  12. 표현층(계속) • Conventional Method • DES(data encryption standard)

  13. 표현층(계속) • Public Key Methods

  14. 표현층(계속) • RSA encryption and decryption - Rivest, Sharmir, Adleman

  15. 표현층(계속) • Authentication

  16. 표현층(계속) • Data Compression

  17. 표현층(계속) • Lossless Compression • Run Length Compression • Statistical • Morse Code • Muttman Coding • Lempel-zivcoding • Relative • Loss compression

  18. 표현층(계속) • Run Length encoding

  19. 22.3 응용(Application)층 • MHS(Message Handling System) • FTAM(File Transfer, Access, and Management) • VT(Virtual Terminal) • DS(Directory Service) • CMCP(Common Management Information Protocol)

  20. 응용층(계속) • MHS(Message Handling System)

  21. 응용층(계속) • Message Format

  22. 응용층(계속) • FTAM(File Transfer, Access, and Management)

  23. 응용층(계속) • VT(Virtual Terminal) • Local Access

  24. 응용층(계속) • VT(Virtual Terminal) • Remote Access

  25. 응용층(계속) • Virtual Terminal

  26. 응용층(계속) • DS(Directory Service) • ITU-T X-500 • DIB(directory information base) • DUA(directory user agent) • DSA(directory system agent)

  27. 응용층(계속) • CMIP(Common Management Information Protocol) • CMIS(Common Management Information Service) • Fault management • Accounting management • Configuration and name management • Performance management • security management

  28. 22.4 요약

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