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- Embed this notice> You don't know which direction any address is so you need a table holding every allocation and the next best hop for it.
at one point everyone on the internet had a table of domain names, stored locally, too
we solved that problem
such tables are a stopgap, a stopgap that survived because the internet isn't big enough to justify building something to replace it
spanning trees are part of the way out, but the full way out hasn't been fully hashed out yet