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参加下图,出现默认网关Ping 不通的情况,出问题的协议层是(  )。
C: \>ping  10.10.10.1
Pinging  10.10.10.1 with  32  bytes  of  data:
Request timed out.
Request  timed out.
Request  timed out.
Request  timed out.
Ping statistics for 10.10.10.1:
Packets:   Sent=4 ,Received=0,Lost=4  (100%  loss)