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both router and Computer NIC card are the same pin arrangment which means both send with pin1 and pin2 and recive on pin3 and pin6 so by using cross over cable we can manage to connect sending pin to Reciving pin in both end but if we use stright through cable we connect sending pin to sending pin/ reciving pin to reciving pin
whenever there are devices working on the same layer of OSI model we will have to use a cross over cable
so its the Layer of funtionality and nothing else..