This report provides a detailed analysis of client-server communication within the Android operating system. Part A introduces Windows diagnostic tools, demonstrating the usage of command-line tools like ipconfig, nslookup, arp, and nbtstat. Part B focuses on Android's architecture, highlighting its six components and their interactions, with an emphasis on the communication between Android System Applications and servers. The report explores network configuration, detailing the client-server model, implementation phases, and technical aspects such as the choice of HTTP clients and thread handling. It also addresses security measures like SSL and network security configurations. Furthermore, the report outlines the advantages, including portability, consistent updates, and open-source nature, and disadvantages, such as security concerns and fragmentation, of the Android OS. The report concludes by emphasizing Android's power and potential for future growth, highlighting its current dominance in the market and comparing its evolution to other operating systems.