Modelling of computer networks and systems using SES/workbench

The authors demonstrate the use of SES/workbench as a tool for developing models of complex computer networks and systems using case studies. The use of submodels hides the details of a module of a complex system from other modules. The computer network model of a Unix-based host computer system and several client workstations has been developed. The components of this computer network such as the host, the network (Ethernet), the router, and workstations are modeled as separate submodels. The application used to demonstrate the results is the File Transfer Protocol. A scenario of multiple clients on different workstations accessing large files from the host computer is simulated. The results are presented in terms of the file transfer time, the data throughput and the average queue lengths of different units