Device addressing is supported through protocols such as Ethernet (the MAC address
is the device address), but these are not used within the IP domain because the
business model is very different. In IP networks, the service provider does not care
92 Chapter 4
about the device accessing their network or the identity of the circuit being used to
access their services.
In the IP domain, such as the Internet, revenues are generated through the purchase
of videos, music, and other goods. Advertising on the various commercial sites provides
yet another revenue stream. So the subscriber identity does not include the device
identity in these networks.
Static addressing is pretty straightforward. The service provider identifies an available
IP address, which then must be configured in the software of the device. It will
identify itself using the assigned IP address each time that device is powered on.
Static addressing puts a strain on network providers with many subscribers, because
there is a limit to the number of addresses that can be supported. Not to mention that
the address becomes attached to a specific location (determined by the wiring of the
network).
Dynamic addressing is assigned through a Dynamic Addressing Host using the
Dynamic Host Configuration Protocol (DHCP). DHCP is a protocol that is used to exchange
IP addresses with configuration servers hosted in the network.
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