One or more trusted network devices within a data network infrastructure determine a physical location of a client device requesting access to the data network infrastructure. A trusted physical location is generated and associated with the client device. The approach can include determining whether a candidate network device is a trusted network device based on a likelihood that the candidate network device can be modified to provide false physical location data. The approach also can include determining a response for an access request by the client and controlling network resources provided to the client based on the trusted physical location.