CCNA Revision (Session 2-2)

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Egypt MoMo-ElSafty - محمد الصفتي
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Published on ● Video Link: https://www.youtube.com/watch?v=9CIJWem8Xcs


Duration: 8:53
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Network Model:
Group of concepts that will help the device to send data hop by hop (Step by step) and then end to end.
-Network Model is always layered.
OSI (Open System Interconnection) (reference model)
Open Standard: Public property for companies to interconnect.
Open Source: Able to Modify & Develop
DOD Model; Department of Defense.
TCP/IP (Transmission Control Protocol) / (Internet Protocol)
The Network Model consists of Layers.
- What is a layer?
It is a function that can be done either by software or hardware.
- Why layered?
Functions are sequenced.



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