This Lab is used for modeling and simulation of both proposed and actual communication systems, subsystems, components, and parts. This Lab uses Qualnet software which provides Qualnet Architect, Analyzer, Packet Tracer, Command Line Inteface and File editor. In Design mode, one can set up terrain, network connections, subnets, mobility patterns of wireless users, and other functional parameters of network nodes. Students can also customize the protocol stack of any of the nodes. And application layer traffic and services that run on the network can also be specified. As simulations are running, users can watch packets at various layers flow through the network and view dynamic graphs of critical performance metrics.