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  • #2141369

    Question on OSI model

    by huyquang2752001 ·

    as far as i know, two computer connect to each other like this:
    Computer A<----->Switch<---->Router<---->Router<---->Router<---->Switch<----> Computer B

    But based on OSI model, the sending side passes data from Layer 7 down to Layer 1, so isn’t the layer 1 device should tranfer the data, and not the router ( which is in layer 3 )
    Or am i misunderstanding something ? Can someone give me a basic explanation

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    • #2414141

      In short.

      by rproffitt ·

      In reply to Question on OSI model

      There’s always a layer 1 since the data has to move across hardware.

      Can’t make it much simpler. A router has layer 1 duties as well as the hosts/clients.

      • #2414140

        question

        by huyquang2752001 ·

        In reply to In short.

        So router not only in layer 3 but also in layer 1 ? you can give answer in a more advanced way if you want

        • #2414139

          Re: layer

          by kees_b ·

          In reply to question

          If A logs in into B to, say, transfer a file, the login process is in layer 5 and goes via the router also.

          Luckily, nobody nowadays uses the OSI model, so why care about it?

        • #2414112

          I apologize.

          by rproffitt ·

          In reply to question

          My background is in hardware design and then later software.

          My short answer is that a router must move data around at a hardware level to get the packet in one port and out another. Even in WiFi this happens all the way from the packet down to an electrical signal on a trace inside the router so layer 1 exists and is used even in router or rather “especially in a router.”

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