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LAYERS 2 AND 3 AND THE INTERNET PROTOCOL
facilitates the daisy-chaining of headers to perform different func-
tions. e latter enables intermediary devices along a path to note
whether or not they have to look further into the contents of a data-
gram or simply relay the datagram toward its destination. e abil-
ity to avoid looking further into a datagram considerably enhances
the packet processing capability of routers and can be expected to
enhance the flow of data through the Internet. Because this section
is focused upon IP addressing, we examine the addressing schemes,
address notation, host address restrictions, and special addresses asso ...