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This can help you determine if a network problem is somewhere on your local network, or somewhere beyond.

You can test whether your computer can reach another device-like your router-on your local network, or whether it can reach a device on the Internet. When it gets the response, the ping tool shows you how long each packet took to make the round trip-or tells you there was no reply. Your computer sends several packets of information out to that device, and then waits for a response. You issue the ping command along with a specific URL or IP address. On a computer network, a ping tool is built into most operating systems that works in much the same way. Ping comes from a term used in sonar technology that sends out pulses of sound, and then listens for the echo to return.