The disclosure relates to a motor vehicle having a data network via multiple control devices of the motor vehicle for exchanging message data (that are coupled together, wherein the data network is subdivided into different domains and via each of the domains respectively some of the control devices are coupled to the data network and in each domain respectively other of the control devices are included and the exchange of message data is blocked between the control devices of different domains or permitted only as a function of an authorization check of at least one domain transition is provided. The disclosure provides that the data network also includes an overall domain and each of the control devices is also coupled via the overall domain to the data network.