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待解决问题
这个没有要求，时延要求越小越好，就像我们要到谷歌的DNS，最大是多少，最小是多少，自然是时延越小，速度越快
C:\Documents and Settings\c114>ping 8.8.8.8
Pinging 8.8.8.8 with 32 bytes of data:
Reply from 8.8.8.8: bytes=32 time=669ms TTL=41
Reply from 8.8.8.8: bytes=32 time=649ms TTL=41
Reply from 8.8.8.8: bytes=32 time=649ms TTL=41
Reply from 8.8.8.8: bytes=32 time=659ms TTL=41
Ping statistics for 8.8.8.8:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 649ms, Maximum = 669ms, Average = 656ms
C:\Documents and Settings\c114>ping 8.8.8.8
Pinging 8.8.8.8 with 32 bytes of data:
Reply from 8.8.8.8: bytes=32 time=669ms TTL=41
Reply from 8.8.8.8: bytes=32 time=649ms TTL=41
Reply from 8.8.8.8: bytes=32 time=649ms TTL=41
Reply from 8.8.8.8: bytes=32 time=659ms TTL=41
Ping statistics for 8.8.8.8:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 649ms, Maximum = 669ms, Average = 656ms
回答时间：2013-4-29 05:21
