In this paper we describe the use of the OPNET
simulation tool for modeling and analysis of packet data
networks. We simulate two types of high-performance
networks: Fiber Distributed Data Interface and
Asynchronous Transfer Mode. We examine the
performance of the FDDI protocol by varying network
parameters in two network configurations. We also
model a simple ATM network and measure its
performance under various ATM service categories.
Finally, we develop an OPNET process model for leaky
bucket congestion control algorithm. We examine its
performance and its effect on the traffic patterns (loss
and burst size) in an ATM network.
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