Part 1 Chapter 1 Foundations topics

Part 1 Chapter 1 Foundations topics

1. Adjacent-Layer interaction

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

2. De-encapsulation

   • The process or removing headers and trailers around some data

3. Encapsulation

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

4. PDU

   • Protocol data unit

5. Frame

   • PDU created by the layer 2

6. Networking Model

   • 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

7. Same layer Interaction

   • 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.