Скачать или смотреть Network Troubleshooting Toolbox

This educational material provides a comprehensive overview of fundamental networking concepts, designed for IT professionals and students. It explains the differences between the OSI and TCP/IP models, highlighting their respective layers and functions. A significant portion focuses on common network protocols and their associated port numbers, crucial for tasks like file transfer, email, and web browsing, and frequently appearing on certification exams. The text also introduces essential command-line tools for troubleshooting network issues, such as ping, tracert, and netstat. The material culminates in scenario-based practice to solidify understanding, emphasizing that memorizing ports and protocols, alongside using diagnostic tools, is vital for efficient network security and problem-solving.