用ping来检查网络时,如下 Reply from 119.75.218.45：bytes=32 time=28ms T

C:Documents and SettingsAdministrator>ping/? Usage: ping [-t] [-a] [-n count] [-l size] [-f] [-i TTL] [-v TOS] [-r count] [-s count] [[-j host-list] | [-k host-list]] [-w timeout] target_name Options: -t Ping the specified host until stopped. To see statistics and continue - type Control-Break; To stop - type Control-C. -a Resolve addresses to hostnames. -n count Number of echo requests to send. -l size Send buffer size. -f Set Don't Fragment flag in packet. -i TTL Time To Live. -v TOS Type Of Service. -r count Record route for count hops. -s count Timestamp for count hops. -j host-list Loose source route along host-list. -k host-list Strict source route along host-list. -w timeout Timeout in milliseconds to wait for each reply. C:Documents and SettingsAdministrator>ping -l 128 127.1 Pinging 127.0.0.1 with 128 bytes of data: Reply from 127.0.0.1: bytes=128 time<1ms TTL=64 Reply from 127.0.0.1: bytes=128 time<1ms TTL=64 Reply from 127.0.0.1: bytes=128 time<1ms TTL=64 Reply from 127.0.0.1: bytes=128 time<1ms TTL=64 Ping statistics for 127.0.0.1: Packets: Sent = 4, Received = 4, Lost = 0 (0% loss), Approximate round trip times in milli-seconds: Minimum = 0ms, Maximum = 0ms, Average = 0ms C:Documents and SettingsAdministrator>