The basic questions in building up computer networks, regardless of wired and wireless, are "are we building the product right?" and/or "have we built the right product?” In order to find out right answers for them, we need to analyze and resolve requirements and to design and virtually realize computer networks prior to real implementation. Network modeling and simulation are appropriate tools for such requirement analysis and virtual implementation.
■ Analytical Modeling
Analytical modeling uses mathematical algorithms to calculate exact measures of network performance.
■ Network Simulation
Simulations employ discrete-event simulation techniques to predict the performance characteristics of computer and communications systems, and to grab subtle characteristics which cannot be recognized in analytical modeling.