Final answer:
To check network traffic in Windows command line, use the 'netstat' command and view the network statistics.
Step-by-step explanation:
To check network traffic in Windows command line, you can use the 'netstat' command. Open the command prompt by pressing 'Windows + R' and then typing 'cmd' and pressing 'Enter'. Once the command prompt is open, type 'netstat -e' and press 'Enter' to display the network statistics. This will show you information such as the number of bytes sent and received, as well as the network connection status.