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 also see a new "unidentified" device on your local network. Wait, is that your roommate’s phone or a neighbor’s hacked camera? GlassWire shows you each device’s traffic. You block the unknown MAC address.
You don't need fancy tools yet. Windows 11 has a built-in snitch. You press Ctrl + Shift + Esc . Task Manager opens. monitor network traffic windows 11
There it is. is chugging 15 Mbps. Windows is secretly uploading updates to other PCs on the internet (a feature called peer-to-peer updates). You right-click, end the task temporarily, and your Zoom clears up.
For a real traffic story—one with logs, graphs, and historical data—you need a dedicated tool. Start with Windows 11’s built-in tools
You apply a filter: tcp.port == 443 (HTTPS traffic). You see your browser talking to Google. Safe. Then you see a rogue UDP stream from a downloaded screensaver app. You uninstall it immediately.
You need more detail. Type "Resource Monitor" into the Start menu. Open it. But never guess—monitor
You switch to the tab. Right-click the column headers and enable "Network" (measured in Mbps). Now, every process is sorted by network usage.