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Network layer,router,forouzan

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why routers have two physical and data layers but only one network layer?

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BECAUSE EACH LOWER LEVEL LAYER ENCAPSULATE HIGHER LEVEL LAYER.

SO PHYSICAL LAYER ENCAPSULATE DATA LINK LAYER AND DATA LINK LAYER ENCAPSULATE NETWORK LAYER .

AND ROUTER HAS TO VISIT PHYSICAL AND DATA LINK LAYER TO REACH NETWORK LAYER.
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