最基本的黑客專用術語(1)

1)ping

ping是一個電腦網絡工具，用來測試特定主機能否通過IP到達。ping的運作原理是向目標主機傳出一個ICMP echo要求封包，等待接收echo回應封包。程式會按時間和反應成功的次數，估計失去封包率（丟包率）和封包來回時間（網絡時延）。

例:

C:\>ping http://www.google.com/

Pinging www.l.google.com [64.233.183.103] with 32 bytes of data:

Reply from 64.233.183.103: bytes=32 time=25ms TTL=245

Reply from 64.233.183.103: bytes=32 time=22ms TTL=245

Reply from 64.233.183.103: bytes=32 time=25ms TTL=246

Reply from 64.233.183.103: bytes=32 time=22ms TTL=246

Ping statistics for 64.233.183.103: Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),Approximate round trip times in milli-seconds: Minimum = 22ms, Maximum = 25ms, Average = 23ms

有關TTL值只供參考而極不準確