why when ping an IP address we get 4 replies ?
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Ping is just a small program which sends ICMP Echo Requests, and receives the ICMP Echo Replies. Actually, many different implementations of ping exist...
On Windows, the default ping utility sends 4 echo request by default. So, when everything is working fine, you will see 4 echo replies. You can send more (or less) requests by passing the
-n option to the ping executable.
On Unix systems, the default implementation will keep sending echo requests until interrupted by the user (with Ctrl-C), and the option to send a specific number of requests is