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Physical networks

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• Physical networks
  • Physical networks:

    Physical network = a network that is established by using hardware (network cards)

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    Examples:

    Ethernet You can buy an Ethernet network card as hardware: Token ring Token bus Ethernet segments interconnected by Ethernet switches

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• Terminology for the Physical network
  • Physical (Network) Address:

    Physical (network) address = the network address of the physical network The physical address is embedded inside the network interface card (NIC) Changing a physical address is very hard to do (well, you can spoof (= masquerade), that's illegal)

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  • Frames:

    Frame = a message that is transmitted on a physical network

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  • ISO level:

    The physical network is layer 1 and 2 in the ISO reference model: