你知道几种ping

关于一个网络工程师而言，ping是再常见不过的测试手法，凡是网络有问题，咱都得先ping一下看，然后再跟据ping的成果再做下一步排错手法的分析。可是ping只处理三层的问题，关于二层呢？还有四层呢？是不是也可以用ping来测试？

(For a network engineer, ping is a very common test method. Whenever there is a problem with the network, we have to ping it first, and then analyze the next troubleshooting method according to the results of ping. But ping only deals with layer 3 issues, what about layer 2? What about the fourth floor? Is it also possible to use ping to test?)

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