XIA supports direct communication with different types of destination, e.g., hosts (red), replicated services (green) and content that can be cached 'anywhere' (blue). The set of destination types can evolve over time through the use of fallback addressing: destination addresses can list multiple ways of reaching a destination, including identifiers for new (e.g., content -- CID) and well-established (e.g., host -- HID) destination types. The use of cryptographic identifiers allows nodes to verify easily that they are communicating with the intended destination. The figure also illustrates the two network deployments planned for XIA: a vehicular network and large scale video streaming. Research on control protocols supporting secure network operations are another focus area for the next phase of XIA.