Quality of service and security are facilitated via functional classification of devices within a network. One method includes receiving, by a first device of devices of a network, notification information of a presence of a second device among the devices of the network, wherein the devices are configured to communicate information about events associated with respective operations of the devices; and generating, by the first device, first information indicative of an identity of and a functional classification of a function of the second device. The method also includes initiating, by the first device to a controller within the network, a transmission of second information for association of third information indicative of the functional classification of the function of the second device with data generated by the second device. The functional classification of the function of the second device is associated with potential impact of failure of the second device.