In FIG. 2, BC 110 is a query originator, a node at which BC 110 is coupled to the network is a query node and nodes at which edge devices 104 are coupled to the network are device nodes. [0050] A query originator can be implemented as a computing device coupled to CDN 100 (or a packet-switched network underlying CDN 100), as program code executing on a general purpose computer, as program code exe