Network dimensioning is becoming important in order to provide a stable Quality of Service (QoS) to the customers. However, it is not an easy task because the Internet traffic changes dynamically and frequently. We thus need a new approach for network dimensioning suitable to the Internet. Probably, it would be quite different from the existing well-established method for the telephone network. Actually, our method proposed in this thesis tries to establish a new paradigm of network dimensioning for the new communication era of the Internet