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CSMA/CD operates at the physical layer is the bottom level in the OSI (open systems interconnection) seven layer model, which is used to standardize and simplify definitions with regard to computer networks. This layer defines all physical and electrical specifications for devices used to interface to the network, and it deals with data only in terms of rawbits (i.e., it does not recognize MAC addresses, IP addresses and packets).

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Q: Which osi layer includes the csma CD mechanism?
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