OSI Model

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'   OSI Model 7 Layers   '
'                        '
' +--------------------+ '
' | Application Layer  | '
' +--------------------+ '
' +--------------------+ '
' | Presentation Layer | '
' +--------------------+ '
' +--------------------+ '
' |   Session Layer    | '
' +--------------------+ '
' +--------------------+ '
' |  Transport Layer   | '
' +--------------------+ '
' +--------------------+ '
' |   Network Layer    | '
' +--------------------+ '
' +--------------------+ '
' |  Data Link Layer   | '
' +--------------------+ '
' +--------------------+ '
' |   Physical Layer   | '
' +--------------------+ '
'                        '
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