Ping is used to check for a network path to a specific host. In this case the script will ping from domain.com to the host you provide. Ping should be the first TCP/IP diagnostic tool you use when tracking down a network problem. Ping uses a series of Internet Control Message Protocol (ICMP, often-pronounced eye-comp) messages, that produces an Echo message to which every host responds. When Ping uses the ICMP messages and replies, it can determine whether the other system is alive, and also compute the round-trip delay in communicating with that system. So Ping can show you how fast the connection is between two ip addresses or domains.
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