VPN Analogy
A network with remote sites can be thought of as a group of
islands served by a public ferry system. While this internetwork of ferries
allows residents to move from place to place at a reasonable cost, there’s no
privacy and any scheduling, routing, and rules are up to the ferry provider.
An alternative would be to build bridges among the islands, but
the cost would be high and some islands might have too few residents to make the
cost worthwhile. These dedicated links, as in WANs, would provide privacy and
more freedom of movement. Unfortunately, like WANs, where distance determines
the cost of the bridge, it’s possible to create situations where connecting a
distant small site with even minimal service could cost many times that of
servicing a much larger and closer group.
Another alternative could be personal watercraft of some type.
These boats could provide private transportation, routing, and scheduling at the
direction of their owner. Even if the people on the ferry see a boat, they have
no idea what’s going on inside, or even its source or destination. Relative to
building bridges, adding more boats as needed would be inexpensive. cp9Tunne
With all the variety in boat types—from canoes and kayaks to
luxury yachts—at least it’s possible that some marinas might not support all
types, thereby limiting the boat owner’s ability to make connections. If a
single standard was adopted by all marinas, such as power boats between 15 and
35 feet, then the boat owner would be free to choose from many vendors as long
as they met the standard. The marinas, as service providers, could still support
other options in addition to the standard.
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