The first section of the Network+ blueprint includes topics related to various networking concepts. It begins with a presentation of the OSI and TCP/IP models, which form the foundation of modern protocols and networking technologies, and then continues with details on classifying applications, devices, and protocols based on the OSI reference model layers, and explaining IP addressing concepts and routing and switching technologies. It also includes detailed information about common network protocols and ports, DNS concepts, network troubleshooting methodology, and identifying virtual network components.