The ping command is usually the first step to diagnose any IP address configuration problem. You can use the command in a number of ways, as discussed in the following sections. You also can use the traceroute command to diagnose reachability problems.

The ping Command

The ping command is the most widely used command by network administrators. It uses ICMP echo request type ICMP packets. When a host receives this type of packet, it replies with an ICMP echo reply type ICMP packet that can be used to determine the round-trip time of the ICMP packet between the source and destination hosts.

By default, the command displays only two messages, showing whether a host is alive or dead. The following ...

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