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Ping is a simple but highly useful
command-line utility that is included in most implementations of
TCP/IP. Ping can be used with either the hostname or the IP address to
test IP connectivity. Ping works by sending an ICMP echo request
to the destination computer. The receiving computer then sends back an ICMP echo reply message.
It is also possible to use Ping to find the IP address of a
host when the name is known. If the ping apple.com command is
typed as shown in the figure, the IP address from which the reply
is returned will display.
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