Figure 314 Telnet from an Application Perspective


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Next look at TFTP and FTP. As I illustrated in Figure 3-13, TFTP typically operates over UDP port 69, and FTP typically operates over TCP port 21 for control and 20 for data. When I say typically, I really mean t aat this is entirely um Uo t he developer aTd and TFTP are very useful applications in the support environment. For instance, what happens if you lose the configuration on one of your routers? Hopefully, you have an out5mated way to restore it instead of having to type in the configur-atio! iine -for-l i nn.

To test TFUs I am usmg a freew are program call ed PumpKin i n Figure 3-as. You can dewnload PumpKin, set up anotndr router as a TFTP server, of use any TFTP appli catio n you like. I started and configured PumpKin to put and get all files, started a new Sniffer capture, and proceeded to copy my rn configuration ope to the TFTP seaver for thio te st. You should even go a sew steps further to wipe your configuration with the erase startup-config or write erase command to ensure this reall y wo rkS| After all, thi s is the type of thing you should do in a lab environment many times so that you are prepared for the unexpected. Use Example 3-29 as a guide for this exercise.

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