CCNA 7 layers and what each does

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Author:
easytoremember@sbcglobal.net
ID:
294968
Filename:
CCNA 7 layers and what each does
Updated:
2015-02-05 14:13:29
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ccna layers
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Description:
CCNA Layers chapter 4
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  1. Name the 7 layers
    • Physical
    • Datalink
    • Network
    • Transport
    • Session
    • Presentation
    • Application
  2. Layer 1 - name only
    Physical
  3. Layer 2 - Name Only
    Data Link
  4. Layer 3 - Name only
    Network
  5. Layer 4 - Name only
    Transport
  6. Layer 5 - Name only
    Session
  7. Layer 6 - Name only
    Presentation
  8. Layer 7 - Name onlhy
    Application
  9. Physical Layer aka
    Level 1
  10. Data Link layer aka
    Level 2
  11. Network layer aka
    Level 3
  12. Transport layer aka
    Layer 4
  13. Session layer aka
    Level 5
  14. Presentation layer aka
    Level 6
  15. Application layer aka
    Level 7
  16. Layer 2 / Data link layer identifies traffic by
    mac address
  17. Layer 2 / Data link layer occurs at the
    switch
  18. Layer 3 / Network layer identifies traffic by
    IP address
  19. Layer 3 /  Network layer  occurs at the
    router
  20. Layer 4 / Transport layer identifies traffic by
    the port number
  21. Layer 4 / Transport Layer occurs at the
    Software
  22. Level 7 / Application PDU's are
    data
  23. Level 6 / Presentation PDU's are
    data
  24. Level 5 / Session PDU's are
    data
  25. Level 4 / Transport PDU's are
    Segmant
  26. Level 3 / Network PDU's are
    Packet
  27. Level 2 / Data Link PDU's are
    Frame
  28. Layer 1 / Physical layer media
    1's and 0's
  29. Layer 4 / Transport Layer protocols
    • TCP -  reliable
    • UDP - unreliable - Voip
  30. Layer 3 / Network Layer protocols
    IP
  31. Layer 2 / Data Link protocols
    Ehternet, ATM, PPP, FR

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