This report delves into the realm of communication technologies within a mobility environment, utilizing the OPNET network simulator to analyze network performance. The report covers various aspects including Mobile IP operation, MANET, FTP, and VoIP performance. It examines the challenges and solutions associated with mobile IP, such as security and long routes, and explores the significance of MANET in dynamic environments. Furthermore, the report investigates the impact of network protocols like FTP and Telnet on network performance, concluding with an overview of the Internet Protocol's role in data transfer. The bibliography includes relevant research papers on mobility, wireless communications, and smart cities, providing a comprehensive understanding of the subject matter.