osi model: explains how data travels thru networks

open systems interconnection

each layer hangles a specific part of transferring data between devices

layers:

	1 physical: hardware, wired-wireless

	2 data link: makes sure data flows without errors

	3 network: handles the data routing, "like a gps"? assigns ip address to packets

	4 transport: makes sure the data arrives properly at the final destination

	5 session: sets up, manages and closes connections between devices

	6 presentation: translates/encrypts data into a format both devices understand

	7 application: the layer the user interacts with directly

example: sending a file

	1: device connects to wifi to start a transmission

	2: prepares file for sending, checks for errors

	3: assigns destination's ip address to packets

	4: file splits file into packets and sends them individually

	5: sets up a session between the communicating devices

	6: encrypts file and checks it's safe

	7: recipient looks at the file through a client