資料來源 : pyDict

存活時間,(簡稱為'TTL',一個數據包在網絡上可以存活的時間)

資料來源 : Free On-Line Dictionary of Computing

Time to Live
     
        (TTL) A field in the {Internet Protocol} header which
        indicates how many more {hop}s this packet should be allowed
        to make before being discarded or returned.
     
        (1994-12-12)