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How to check the network by the PING command
On your PC, select the Window's [Start] button → [All Programs] → [Accessories] → [Command Prompt].
In the Command Prompt, enter "ping (the destination IP address)" and press ENT key.
If it shows "0% loss", the network is normal. However, there is some problem if it shows "100% loss". In this case, check your network environment.