host on the network assigns the first six digits of the mac address.
host on the network assigns the first six digits of the mac address.
who assigns the first six digits of the mac address?
host on the network
the local network addresses used in ieee 802 networks and fddi networks are called media access control addresses; they are based on the addressing scheme that was used in early ethernet implementations. a mac address is intended as a unique serial number. mac addresses are typically assigned to network interface hardware at the time of manufacture. the most significant part of the address identifies the manufacturer, who assigns the remainder of the address, thus provide a potentially unique address. this makes it possible for frames to be delivered on a network link that interconnects hosts by some combination of repeaters, hubs, bridges and switches, but not by network layer routers. thus, for example, when an ip packet reaches its destination (sub)network, the destination ip address (a layer 3 or network layer concept) is resolved with the address resolution protocol for ipv4, or by neighbor discovery protocol (ipv6) into the mac address (a layer 2 concept) of the destination host.
medium access control
zenith updated their white modems to a matte black case, adding the homeworx name and marketing to cable operators at the $350 price range for 250 units. the new design used the same size external case, added leds to indicate power/tx/rx/activity and replaced the full sized eight-bit isa card with a smaller 16 bit version. the new design dropped the onboard cpu. the modem connected to the card used a 15-pin d-shell connector—which exactly matched the pc's game connector. both models were powered by the pc. the new modem was frequency agile, with a configuration utility that ran on the pc to set up us and ds frequencies. the option to configure the card's mac address was soon dropped. however, the card's mac address was not printed on the outside of the board, and thus was invisible once installed in the pc. nor was the mac address printed in a machine readable (bar code) format. cox added these to the cm prior to installation, and tracked the subscriber to modem mac address in an excel spreadsheet, as the mac address contained too many digits to fit into any fields within the customer billing system.
zenith cable modem