OSI Reference Model

layer 7

application

layer 6

presentation

layer 5

session

layer 4

transport

layer 3

network

layer 2

data link

layer 1

physical layer

application layer

responsible for interacting with end users through application software (all programs on a pc that allows users to interact with the network)

presentation layer

responsible for coding of data, translating it to a format that’s secure and efficient for transmission. ENCRYPTION OCCURS HERE

session layer

responsible for maintaining communication sessions between computers. creates, maintains, and disconnects communications that take place between processes on different computers or devices over the network

transport layer

responsible for breaking data into packets and transmitting over the network. flow control & error checking occur here

network layer

responsible for logical implementation of network. IP addresses here

data link layer

responsible for transmitting information on computers connected to the same LAN. each hardware has a unique MAC address

physical layer

responsible for physical operation of the network. translates binary into computer language

All People Seem To Need Data Processing

application, presentation, session, transport, network, data link, physical