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For IT infrastructure starters i have created a basic over view docs on OSI layer & different technologies we are using now a days....   Please click the link for the simple and detailed presentation  --> Network & Security Overview.PPT.

Agenda covered on presentation as below: -   Network & Security Overview.PPT.

Major Chuck to understand deeply on Network & Security  is OSI layer, brief details as below from presentation.

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Please feel free to ask any technical doubt from Network & Security..