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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 10.10.10.1Pinging 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)