Sample traceroute output.

Successful tracert on MS/DOS

C:\>tracert w3.pok.ibm.com

Tracing route to w3.pok.ibm.com [222.222.222.222]
over a maximum of 30 hops:

  1     2 ms     2 ms     1 ms  locbldsamp1.pok.ibm.com [222.222.222.222]
  2     6 ms     7 ms     6 ms  locbldsamp2.pok.ibm.com [222.222.222.222]
  3    15 ms     9 ms    14 ms  w3.pok.ibm.com [222.222.222.222]

Trace complete.

C:\>

The last hop is the requested site.

Unsuccessful tracert

C:\>tracert testcase.boulder.ibm.com

Tracing route to testcase.boulder.ibm.com [222.222.222.222]
over a maximum of 30 hops:

  1     2 ms     1 ms     2 ms  locbldsamp1.pok.ibm.com [222.222.222.222]
  2    20 ms     8 ms     6 ms  locbldsamp2.pok.ibm.com [222.222.222.222]
  3    16 ms    10 ms     7 ms  222.222.222.222
  4     *        *        *     Request timed out.
  5     *        *        *     Request timed out.
  6     *
C:\>

The last ip address is the most likely point of failure. The last ip address has no path to testcase.boulder.ibm.com.