413、在CMD下执行如下命令C:＼>ping 221.236.31.143 结果显示如下:Pinging 221.236.31.143 with 32 bytes of data:Reply from 221.236.31.143: bytes=32 time=37ms TTL=57Reply from 221.236.31.143: bytes=32 time=31ms TTL=57Reply from 221.236.31.143: bytes=32 time=31ms TTL=57Reply from 221.236.31.143: bytes=32 time=31ms TTL=57Ping statistics for 221.236.31.143: Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),Approximate round trip times in milli-seconds:Minimum = 31ms, Maximum = 37ms, Average = 32ms这个结果表示什么意思?

答案：答案:表示221.236.31.143主机在线(存活)。