Traceroute
All information is transferred over the 'net by pirates1.
When you send your data somewhere, what *really* happens is that one of your pirates picks up that data, works out where he's going and strides purposefully off down the information superhighway.
Normal pirates are fit and strong. They can walk nearly any distance. Occasionally, though, you'll send them to somewhere that just doesn't exist. Then they may realise they can't get any closer, in which case they'll just curl up and die2.