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OSI model

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OSI model
model with 7 layers to describe communication systems
application layer
Highest layer of a networked communication model
network layer
layer 3 of the OSI model for computer communication
data-link layer
second layer of the OSI networking model
physical layer
the lowest-level electronic or optical transmission functions of a network
transport layer
layer in the OSI and TCP/IP models providing host-to-host communication services for applications
presentation layer
6th layer of the OSI model of telecommunications; the least abstract for which data representation makes much sense
session layer
part of seven-layer computer networking model
Protocol Wars
Computer science debate