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Top-level distribution Top-levels of trees distribute their coverage region to peers either civic pattern (C=US, A1=NJ) or polygon Peers distribute data to other peers ? top-level scope data gets flooded to all resolvers new resolvers query peer for current data set periodic “do you have any new data” to avoid sync loss volume of data modest since top-level coverage changes slowly estimate: one map/month (few thousand bytes/month) |