In an example, a computer-implemented method includes generating test data that is configured to be identified as data of interest at one or more visibility points in a network having a plurality of network routes. The method also includes injecting the test data into each network route of the plurality of network routes at a location upstream from the one or more visibility points, and determining, for each network route through which the test data travels, whether the test data is identified at the one or more visibility points. The method also includes outputting, for each network route through which the test data travels, data that indicates whether the test data is identified at the one or more visibility points as data of interest.