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In this thesis a Java program is developed that can be used to visualize networks previously described in configuration files. These networks must consist of layer 2 switches and hosts only. After loading such a configuration file, the program will visualize the network, and the spanning tree algorithm IEEE 802.1D may be started. The program allows the user to modify specific attributes of switches and hosts. The hosts will be able to exchange messages. The switches are realized as threads so that they can run independently and parallel to each other. The absence of central coordination and control prevents the switches from sharing global knowledge. This characteristic renders the implementation closer to the way an actual network functions.