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by THENETWORKA on December 2nd, 2011

THENETWORKA

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what can you tell me about the seven layers of osi model?

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  • by jailhousews on December 7th, 2011

    jailhousews

    From the CompTIA Network+
    Certification Study Guide, 4th Edition:
    (Paraphrased)

    OSI (Open Systems Interconnect) is a standard for manufacturers of networking components that allows them to communicate in dissimilar environments. Each layer is responsible for a specific function or task within the stages of network communication.

    Starts with application layer on sending machine, down to physical layer, then from physical layer of receiving machine up to application layer (up/down refers to hierarchy).

    Application: Initiates request
    Presentation: Formats data; enacts compression, encryption
    Session: Establishes and manages session
    Transport: Breaks data into packets; ensures delivery
    Network: Logical addressing, routing, and delivery of packets
    Data Link: Physical addressing (MAC), converts packets to signals
    Physical: Places signal on the wire

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  • by Kiku on December 3rd, 2011

    Kiku

    http://www.webopedia.com/quick_ref/OSI_Layers.asp

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