1. Physical layer - electrical signaling/bits/digital to analog/analog to digital, 2.Data Link - formats data into frames/mac addressing, 3.Network - logical addressing/packet creation/routing, 4.Transport - divides data into segments/error correction, 5.Session - establish and terminate network communications, 6.Presentation - Encryption/compression/Conversion of ASCII to EBCIDIC, 7.Application - protocol definition(HTTP)/data formatting/emulation,

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