A system for controlling access to a protected network includes a network access control module coupled to the network and configured to restrict access to the network to an authorized user through a computer coupled to the network. The system also includes a communication device associated with the computer, which automatically transmits a unique identifier corresponding to the communication device to the network access control module when a user uses the communication device to request access to the network via the computer. When the network access control module receives the unique identifier it is configured to authenticate the communication device, to authenticate the user via the communication device when the communication device is authenticated, and when the user is authenticated, to submit log-on information to a log-on interface of the computer associated with the communication device so that the user can access the network via the computer.