This report provides an overview of IT infrastructure management in Telstra, including the background of the organization, data usage, network devices, application software, and the OSI model. It discusses the types of data used by Telstra and two solutions for IT infrastructure for storing and accessing data. It also explains the network devices required for day-to-day activities in Telstra and the application software needed for data communications. Additionally, it provides an overview of the seven layers of the OSI model.