Ping: The Network Troubleshooter's Favorite Tool
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By common agreement between all Internetwork equipment manufacturers, any
well-behaved computer or router that receives a - "ping" - request is expected
to immediately send a - "ping reply" - message back to the originating computer.
Thus the - "ping" - command is universally employed as the most basic form of Internet diagnostic tools. If you ever suspect that your computer is having trouble connecting with the Internet or with some other computer, printer, or gateway device on your own local network, you can construct a - "ping" - command to test your connection.