例21.5（续 traceroute xerox.com traceroute to xerox.com(13.1.64.93),30 hops max,38 byte packets 1 Dcore.fhda.edu (153.18.31.254) 0.622ms 0.891ms 0.875ms 2 Ddmz.fhda.edu (153.18.251.40) 2.132ms 2.266ms 2.094ms 3 Cinic.fhda.edu (153.18.253.126) 2.110ms 2.145ms 1.763ms 4 cenic.net (137.164.32.140) 3.069ms 2.875ms 2.930ms 5 cenic.net (137.164.22.31) 4.205ms 4.870ms 4.197ms 。 。 。ee。 ，年。 14 snfc21.pbi.net (151.164.191.49) 7.656ms 7.129ms 6.866ms 15 sbcglobal.net (151.164.243.58) 7.844ms 7.545ms 7.353ms 16 pacbell.net (209.232.138.114) 9.857ms 9.535ms 9.603ms 17209.233.48.223 (209.233.48.223) 10.634ms 10.771ms 10.592ms 18 alpha.Xerox.COM (13.1.64.93) 11.172ms 11.048ms 10.922ms 21.35 21.35 例 21.5 (续)