A command used to check if the requested Speed Test Server is available on the Internet and if available, the Ping measures the turnaround time from your computer from when the Ping is sent until a response is received from the Speed Test Server.
Data packets in an ideal world should all arrive with the same delay time between them. Jitter measures the difference in this delay time between each packet received from the Speed Test Server.
The maximum data speed available from the Speed Test Sever to your PC.
The maximum data speed available from your PC to the Speed Test Server.