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Routing TCP/IP, Volume I (CCIE Professional Development) by Jeff Doyle

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Data Link Addresses

In a certain community in Colorado, two individuals are named Jeff Doyle. One Jeff Doyle frequently receives telephone calls for the person with whom he shares a name—so much so that his clever wife has posted the correct number next to the phone to redirect errant callers to their desired destination. In other words, because two individuals cannot be uniquely identified, data is occasionally delivered incorrectly and a process must be implemented to correct the error.

Among family, friends, and associates, a given name is usually sufficient for accurately distinguishing individuals. However, as this example shows, most names become inaccurate over a larger population. A more unique identifier, such as a United States Social ...

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