The Open Systems Interconnection Model is a stack of protocols for system intercommunication. **Please do not throw sausage pizza away** ![[../../00 Asset Bank/Pasted image 20250902192605.png|invert_S]] Good in theory, I hate *IB*. Developed by committee. # Example, SEA -> SFO *Application*: The raw data. ###### Presentation Some header, the data encrypted, and maybe a footer. ##### Session Some header with a number (ex. 1/5, 2/5), the presentation, maybe a footer. #### Transport Something something, like session, something something error handling, something something splits, something this model is bullshit and made by a committee (its bullshit because I dont understand it). > ill ask ab this one later for the details ### Network Contains the 'from' and 'to' (SEA -> SFO), and the transport. ## Data Link (Frame) Contains the 'from' and 'to' depending on whether there is an actual connection between the two targets. For example, if there is no connection between SEA and SFO, the frame might be SEA -> PDX (Portland), when it gets to portland it will then route again. # Physical The physical bts are transferred using some technology (wires, radio, any).