The ping command depends only on the very lowest level of networking software. So if ping cannot reach another computer, that strongly suggests either a network break or that the other conputer is dead .

• ping命令仅依靠网络软件的最底层，如果ping命令不能到达另一台计算 机，这足以说明网络中断了，或者是另外那台计算 机死机了。