ping返回结果

做实验的时候看到ping出来的结果不是我们熟知的!或者.号,而是其他的符号,到网上baidu了一下,找到了这些符号的含义如下:
!  
    Each   exclamation   point   indicates   receipt   of   a   reply  
     
  .  
    Each   period   indicates   the   network   server   timed   out   while   waiting   for   a   reply  
     
  U  
    A   destination   unreachable   error   PDU   was   received  
     
  Q  
    Source   quench   (destination   too   busy)  
     
  M  
    Could   not   fragment  
     
  ?  
    Unknown   packet   type  
     
  &  
    Packet   lifetime   exceeded  

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