Part 1 Chapter 1 Foundations topics

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• Application layer relays on the transport layer to deliver its messages. Is the interaction between upper and lower layers 

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• The process or removing headers and trailers around some data

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• Refers to the process of putting header and some time trailers around some data

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• Protocol data unit

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• PDU created by the layer 2

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• 7 Application 6 Presentation 5 Session 4 Transport----Segment 3 Network----Packet 2 Data link----Frame 1 Physical  All People Seems To Need Data Protection

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• Is when two layers at the same OSI level interact betwen each others for Example PC1 sending data to PC2 using Layer 3. 2 same layer interacting between each others.