If a host is known but you find that users are complaining that the host itself or an application running on it isn't responding, use ping and look for 0% packet loss (see Listing 6).
如果主机是已知的，但是用户抱怨这个主机本身或它上面运行的应用程序没有响应，那么使用ping并查看数据包丢失率是否为0%(见清单6)。
A ping fails when the number of packets received is less than the number sent and packet loss is greater than 0 percent.
当收到的数据包数量少于发送的数量，数据包损失大于0时，ping失败。
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