a) Find the average and the standard deviation of the round-trip times between the source and the

destination.

b) Find the number of routers in between.

c)

Mark on the printout routers belonging to the same ISP (hint: these are typically routers with

similar names or IP addresses).

d) Mark on the printout the hop with the largest delay. In your experiment, does the largest delay

occur at the interface of two different ISPs?

Traceroute tracing path from www.net.princeton.edu to 146.186.157.6 traceroute to 146.186.157.6 (146.186.157.6), 30 hops max, 40 byte packets 1 core-87-router (128.112.128.2) 1.213 ms 0.719 ms 0.418 ms 2 border-87-router (128.112.12.142) 1.660 ms 1.304 ms 0.862 ms 3 locall.princeton.magpi.net (216.27.98.113) 1.947 ms 1.787 ms 1.857 ms 4 216.27.100.18 (216.27.100.18) 2.118 ms 2.053 ms 2.038 ms 5 et-1-1-0.4079.rtsw.wash.net.internet2.edu (162.252.70.119) 6.545 ms 5.637 ms 5.500 ms 6 ae-1.4079.sdn-sw.ashb.net.internet2.edu (162.252.70.137) 6.074 ms 6.196 ms 6.151 ms 7 et-7-1-0.4079.rtsw.chic.net.internet2.edu (162.252.70.61) 22.398 ms22.690 ms 22.487 ms 8 198.71-45.157 (198.71-45.157) 37.373 ms 63.756 ms 37-342 ms 10 12** 13 horned-screamer.cac.psu.edu (146.186.157.6) 38.660 ms 38.592 ms 38.599 ms Done Traceroute tracing path from www.net.princeton.edu to 146.186.157.6 traceroute to 146.186.157.6 (146.186.157.6), 30 hops max, 40 byte packets 1 core-87-router (128.112.128.2) 1.213 ms 0.719 ms 0.418 ms 2 border-87-router (128.112.12.142) 1.660 ms 1.304 ms 0.862 ms 3 locall.princeton.magpi.net (216.27.98.113) 1.947 ms 1.787 ms 1.857 ms 4 216.27.100.18 (216.27.100.18) 2.118 ms 2.053 ms 2.038 ms 5 et-1-1-0.4079.rtsw.wash.net.internet2.edu (162.252.70.119) 6.545 ms 5.637 ms 5.500 ms 6 ae-1.4079.sdn-sw.ashb.net.internet2.edu (162.252.70.137) 6.074 ms 6.196 ms 6.151 ms 7 et-7-1-0.4079.rtsw.chic.net.internet2.edu (162.252.70.61) 22.398 ms22.690 ms 22.487 ms 8 198.71-45.157 (198.71-45.157) 37.373 ms 63.756 ms 37-342 ms 10 12** 13 horned-screamer.cac.psu.edu (146.186.157.6) 38.660 ms 38.592 ms 38.599 ms Done