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Application layer
7th layer, human-computer interaction, applications access network services
presentation layer
6th layer, data formatting (html/css), data encryption
session layer
5th layer, maintains connections and controls ports/sessions
transport layer
4th layer, transmits data using TCP/UDP, breaks up data (going down) and reassembles them (going up) into segments (big)
network layer
3rd layer, decides which physical path data will take, routes data between two different networks, breaks segments (big) into packets (small) and reassembles them
data link layer
2nd layer, routes data between two devices on the same network, breaks packets (small) into frames (tiny) and reassembles them
physical layer
1st layer, includes physical equipment (cables/switches), data gets converted into bits