Reliable communication network is the most fundamental of any enterprise. Then the first and foremost thing is making an estimation of the performance of the desired network. 

In this project, we describe the use of the OPNET (Optimized Network Engineering Tools) simulation tool for modeling and analysis of the different LAN (Local Area Network) technologies at Layer 2. OPNET is a comprehensive simulation tool for performance evaluation of communication network. The LAN technologies include Ethernet, Coaxial Ethernet, Token ring, and FDDI (Fiber Distributed Data Interface). 

The aim of the project is to study performance characteristics of different LAN technologies at Layer 2 by gathering statistics such as delay, throughput, and load and link utilization. The results gathered from simulation are analyzed and compared with each other. The conclusions are made in terms of projection of the performance of each individual technology. So, it can help us to choose the best technology for desired specification.