Usually a ping is used to check if a machine is up and to check the network status.
It is a small network packet sent to the machine. If the machine is up, an answer will be sent. The time needed to get the answer is called ping time or round-trip time.
The ping response from an IP indicates the machine is up.
Unfortunately this can be used to quickly scan an IP-range for reachable hosts.
Thursday, April 29, 2010
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