You don't need fancy tools yet. Windows 11 has a built-in snitch. You press Ctrl + Shift + Esc . Task Manager opens.
Something on your Windows 11 machine is quietly eating your bandwidth. Time to become a detective. monitor network traffic windows 11
Start with Windows 11’s built-in tools. If you need evidence for later (e.g., "prove to my ISP that I'm not using 2TB a month"), install GlassWire. For security investigations, learn Wireshark. But never guess—monitor. You don't need fancy tools yet