I'm going to lorenzo walker.
Please teach me some basic information about computers .

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I have one question.
We know there many congestion control methods for Layer 4.
Now when a router gets a packet, it will check for the best path possible. Suppose there's too much congestion in that best path. 
Will the flow be L4 --> L3 --> L4 as congestion techniques are defined only at L4.

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I would like to communicate networking fundamental.
Thanks/Pravin Kumar
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