I apologize for asking stupid questions, but I'm trying to understand the terminology in this discussion. If a network has no connection to a provider, are all of its routers "stub routers"? What constitutes a provider? If two administrative domains interconnect but still have no connection to the internet at large are all their routers stubs or do those that deal with the foreign domain become more "authoritative"? If "authoritative" are they then demoted if one or both of the domains attaches to a commercial ISP?
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