说明：  Ping命令是我们日常网管工作中使用频率最高的工具之一，主是用来测试网络连接的。在实际平时解决网络故障的过程中，一般应该遵循“先软后硬”的步骤来进行。
(Ping command is our day-to-day management work, the most frequently used one of the tools, the main is used to test network connectivity. Usually resolved in the actual process of network fault, the general should follow the first post-soft-hard to carry out the steps.)