Communication technology has been increasingly advancing during the last decade. Network resources are highly demanded by both the users and carriers. Demands on network resources place a potential burden on network performance. This th sis uses object-oriented modeling techniques to abstract the problem domain of a network for analysis. Commercial tools, namely COMNET III and OPNET, were used to build and to simulate the network models. The tools themselves are validated using a Poisson Process. Analytical results are used to help validate the simulations. The thesis also provides a brief description of the telecommunication standards that the models represent, allowing readers a better understanding of the network structure and behaviour.