An authentication and network management system for Wi-Fi local area networks includes a network management device and a plurality of Wi-Fi local area networks coupled to the network management device. Each local network includes at least one access point device having a Wi-Fi radio. A plurality of end user devices are attachable to the network forming nodes thereof, and each end user device has input plugs, such as USB ports and the like, for coupling accessories thereto. An authentication device is provided in the network for authenticating the end user devices attached to the network. A plurality of authenticating keys is provided, with each key attachable to an input plug of an end user device. Each key contains a validation certificate therein, wherein the authentication device verifies the presence of a current validation certificate on a key coupled to the end users device prior to granting access to the network.